RULES

GENERAL RULES

The intended purpose of this rule book is to make for an even playing field for all competitors competing at Thunder Mountain Speedway. The promoters and officials will strive to the best of their abilities, to enforce all rules fairly and with respect. The nature of the sport has proven that questions concerning rules and procedures will arise from time to time. The promoters and officials will deal with these concerns in an orderly and fair manner. ALL COMPETITORS, CREW MEMBERS AND OFFICIALS SHOULD BE FAMILIAR WITH THE RULES AND PROCEDURES OF THIS BOOK.

RULEBOOK DISCLAIMER: The rules and/or regulations set forth herein are designed to provide for the orderly conduct of racing events and to establish minimum acceptable requirements for such events. By participating in these events, all participants are deemed to have complied with these rules. NO EXPRESS OR IMPLIED WARRANTY OF SAFETY SHALL RESULT FROM PUBLICATIONS OF OR COMPLIANCE WITH THESE RULES AND/OR REGULATIONS. They are intended as a guide for the conduct of the sport and are in no way a guarantee against injury or death to a participant, spectator or official.

The Promoters shall be empowered to permit minor deviation from any of the specifications herein or impose further restrictions that in their opinion do not alter the minimum acceptable requirements. NO EXPRESSED OR IMPLIED WARRANTY OF SAFETY SHALL RESULT FROM SUCH ALTERATION OF SPECIFICATIONS. Any interpretation or deviation of these rules is left to the discretion of the promoters and officials. Their decision is final.

Tech inspector and track promoters reserve the right to check and deem any car unsafe or illegal based on the following rules. If you do not read a specific rule in this rule book, you will need to check with tech inspector and/or speedway promoters before assuming something will be legal. Items not covered in this rule book will be at the discretion of Thunder Mountain speedway officials and promoters.

Any time the word “stock” is used in this rule book to describe cars, parts or components, means available over the counter from GM, Chrysler or Ford authorized dealers (Also to mean stock from the aftermarket).

 

INSURANCE

  1. Any person who enters the pit area and has signed the waiver release form at the pit entry is entitled to benefits arranged by the speedway. All children entering the pit area must have a minor waiver release form signed by a parent.
  2. It is highly recommended that all competitors carry additional life and medical insurance.
  3. Anyone involved in an accident while on the racing premises must report the incident to the promoters before leaving the facility that night (if they are not able, someone from there team must report it). Incidents not reported that night, these benefits will not be available per the insurance company.
  4. The minimum age to enter the pit area may be changed at any time.
  5. Driver’s minimum age is fourteen (14) with properly signed waiver release form by a parent.

 

SPEEDWAY FACILITY

  1. There will be NO drinking of intoxicants by anyone entering the pit area prior to or during any racing event. Anyone in the pit area suspected of drinking alcohol before or during an event will be removed from the pit area and possible suspension.
  2. At all racing events, driver and owner assumes the responsibilities of not only their own actions, but also the actions of their crew. This goes for actions anywhere on speedway premises. The driver and/or owner shall be the only spokesperson for the team.
  3. In the event of a disagreement, anyone taking physical action for any reason will be subject to suspension and/or fines. This will include the person and the car they are associated with. Suspension and/or fine will be determined by the speedway promoters.
  4. There is local law enforcement on the speedway grounds at all times during a racing event in the case any arrest needs to be made.
  5. NO one shall enter the tower or flag stand during or after the racing event other than track officials. Anyone doing so will face suspension and fines for themselves and the team they are affiliated with. Anyone wanting to discuss a scoring decision must report to the pit steward to contact the appropriate official.
  6. Anyone deliberately disobeying an order from any track official is subject to suspension and/or fine as well as the car they are affiliated with.
  7. Any driver and/or owner found violating any of the rules or procedures of this rule book shall be subject to suspension and/or fines.
  8. Any fines need to be paid in full before that person is able to enter the pit area again.
  9. The promoters have the right to prohibit anyone suspended from another race track from entering the pit area for the length of their suspension.
  10. Live feed of all speedway events is STRICTLY prohibited. Anyone found streaming live will be removed from the premises. Race teams will lose points and pay.

 

SAFETY

DRIVER:

  1. Driver’s seat must be securely fastened to frame or cage in at least six spots, (4 bottom 2 back) with minimum 3/8” bolts. Seats mounted over drive lines must have minimum 1/8” steel plate under and up the back 4” at least the width of the seat.
  2. Seats must be high back aluminum racing seat .090 minimum thickness. No fiberglass, plastic or bucket seats.
  3. Mandatory shock resistant roll bar padding on all bars that the driver’s head or other body parts may come in contact with while strapped in the seat. On cars with center steering, both housings must be covered with same type padding.
  4. Mandatory while driving: Full face helmet, Snell approved 2005 or newer and no older than 5 years old from production date. Must be in good condition and no hard-hit marks. Fire suit: Minimum SFI 3-2A/1, 1 or 2 pieces. Must be in good condition, no tears, holes or broken zippers. Gloves: Must be minimum Nomex single layer and in good condition. Neck support: either collar type or SFI rated neck support system. Recommended: Nomex underwear, socks, hood and fire proof driving shoes. BELTS: Must be SFI dated and tagged by manufacture, cannot be older than 5 years from the production date. Any belts not tagged will be considered expired. Recommend replacing all belts after any strong impacts. Any belts in an unsafe condition must be replaced regardless of age. Must be minimum 5-point harness and with minimum 3” wide lap and shoulder belt and 2” wide submarine belt and quick disconnect. All belts must be mounted as per manufactures instructions to the frame or cage.
  5. All crews must have operable fire extinguishers capable of putting out fuel and oil fires.

 

CAR:

  1. All cars are subject to inspection at any time and must be free from mechanical defects and be in safe condition.
  2. Drive Shaft Cover is mandatory. All cars with open shafts must have a tunnel, min. 1/8” steel from 2” under front edge of seat to back of transmission covering shaft and “U” joint on top and both sides down to floor. It must be held in place with at least four (4) 3/8” bolts minimum, to a substantial cross member. A 360-degree aluminum tubing of no less than ¼” wall 6061-T6 material will be accepted providing it covers complete shaft and “U” joint back to seat. No cast or welded tubing. The drive shaft cover must be solid, no cutaways for lightening purposes. Drive shafts must be painted white. NOTE: Closed drive type cars, torque tubes or bells that already have a 360-degree covering from “U” joint to seat will be accepted.
  3. Any car that has a suspension link such as a torque arm, coil over or trailer bar in the driver’s compartment, must have a steel cable (min ¼”) or clamp around it to limit its range should it break loose from its mount. Should be free of sharp edges and padded if possible.
  4. All classes require a drive shaft loop that must go completely around the drive shaft made of substantial material.
  5. Mandatory windshield screen of substantial material (no chicken wire or aluminum) must cover the entire windshield area. Full fender cars must have a center windshield post connected to the cage.
  6. All cars MUST have a fuel shut off within reach of the driver and clearly labeled ON and OFF. All fuel lines running through the driver’s compartment should be run in a safe manner. Braided fuel lines recommended. Lines should be run through rubber or steel conduit. No cast fittings.
  7. All wheels must have minimum of five (5) lug nuts.
  8. Exhaust must be safe from driver and exit past the driver’s seat. All cars must have mufflers.
  9. No mirrors.
  10. All cars should be neatly painted with bold neat numbers on both doors and the roof minimum 16” tall and numbers on the front and rear of car.
  11. Inspector reserves the right to request body sheet metal to be replaced and painted if it has been badly damaged.
  12. Fuel cells must be securely mounted by at least two (2) steel straps, each 1” wide minimum. Each strap must be mounted with at least two (2) 5/16” bolts. Fuel system must have tip over safety and breather valves. A reinforcing cage or chassis bar must be installed behind the fuel cell.
  13. Must have two (2) throttle return springs and a steel toe loop on the gas pedal.
  14. All cars will have an ignition switch and master disconnect switch within reach of the driver boldly labeled ON and OFF.
  15. All cars must be equipped with a quick release steering wheel.
  16. No ballast weight of any kind should be attached to axel tubes or rear ends. No exceptions.

 

HANDICAPPING

  1. The number of cars to be qualified through each heat and consi will be determined by the handicapper and posted on the pit board before the first heat.
  2. If a driver qualifies more than one car, he must drive the last qualified car in the feature. The other car is not eligible. On postponed events, the driver qualified may run a different car without losing his position.
  3. All driver changes MUST be reported at pit check in or to the pit steward. Failure to report a driver change will result in a one-week handicapping penalty and no points or money for that race.
  4. Any handicapping and scoring inquiries must be made to the pit steward. NO person affiliated to any race team is allowed in the scoring tower. Failure to abide by this rule will result in suspension and fines for that race team and individual.
  5. Finishing order, money and points are considered official when posted at the pit board after the feature. Drivers have ten minutes to protest the finish once it’s posted at the pit office. Any questions regarding the finishing order must be directed to the pit office. Any discrepancies must be taken care of before leaving the speedway that night.
  6. No car can compete in two (2) classes without prior approval from the promoters.
  7. Drivers competing in more than one class must pay a $50 registration fee for each car. Must not run the same car twice.
  8. The first two (2) weeks of a new season will be a draw for heat starting positions in all classes. Feature line ups will be a redraw based on the number of cars. The number to redraw will be posted on the pit board before the first heat race. Regular handicapping will start on week three.
  9. Starting in week three, if any of the top five (5) in track points fail to qualify for the feature they will be offered the opportunity to “buy in”. Only two (2) spots will be taken starting with positions 1 – 5 in points. They must have attempted to qualify. If the top five in the current points standings all are qualified, the “buy in” will be offered to the previous seasons top five (5) in points.
  10. Bubble cars will be used if there are qualified cars that cannot make the feature and there are no “buy in” cars, to fill the field at 24. They must be ready and on the track before the field takes the white flag for the original start.
  11. Drivers must take the original green flag to receive points and pay. Any qualified car that does not take the original green flag will be considered “DNS” did not start.
  12. All restarts will be lined up based on the last completed lap.
  13. Handicap points will be based on points earned over the past three complete features. Cars not entering those events will be handicapped as a win plus one point.
  14. The number of cars to qualify and be handicapped for the feature will be determined by the number of cars entered that night. It will be posted on the pit board before the first heat.
  15. MyLaps transponders are MANDATORY for ALL classes. Anyone without a working transponder will be scored last for pay and points.

 

PITS

  1. No excessive speeding in the pits. Penalties will be issued for speeding.
  2. All cars must be staged before their event goes on the track or will have to start in the rear. If a car will not start in the staging area, it may be pushed started and keep their original starting position as long as they do not hold up the start of the race. If they hold up the start of the race they will have to start in the rear.
  3. We will not wait for any cars to start a race. Must be ready when your race comes on the track. If not on the track for the original green flag you will not be able to run.
  4. When entering or exiting the race track you must keep your car under control, to avoid other cars and crew members in the pits.
  5. There is NO use of the track other than crossing over it when entering the pits and exiting the track. Except for the winner to visit victory lane in front of the grandstands.
  6. No drums of fuel allowed it pit area.
  7. During feature events only, we will try to give a race team two (2) caution laps to change a flat tire or make a minor repair. We will NOT give a car 2 laps if they stop on the track to bring out the caution flag. This rule is in effect as long as there is allowable time due to curfew.
  8. Final finishing orders will be posted on the pit board shortly after each feature. A ten-minute protest period is in effect once the finish is posted at the pit office. Any discrepancies must be made then to the pit office to get resolved. Payoff is at the pit office.

 

TRACK

  1. The flagger’s lap count is official.
  2. Flagger has complete charge of track while racing. No protest allowed on flagger’s decision.
  3. Only track officials, safety and wrecker crews will be allowed on the track in the event of an accident. NO crew members are allowed on the track. Violation may cause disqualification and/or suspension.
  4. No repairs can be made on the track. You must report to the pit area and return to the rear of the field.
  5. Under caution, any car that goes to the pits must return to the rear of the field.
  6. All cars must take the initial green flag in the feature to be eligible for points and money.
  7. Any car that is involved, spins or stops to avoid an accident is considered part of the caution and must start in the rear.
  8. If the caution comes out for an accident in turn one and someone spins in turn three after the original caution has been displayed, they are not considered part of the caution and can remain in their position.
  9. Anytime the red flag is displayed all cars are to stop as soon as safely possible. No cars can enter the pits or be worked on as long as the red is displayed.
  10. Any car causing three (3) cautions in the same event will be sent to the pits. The flagger may black flag any car causing unnecessary delays or for safety reasons. If given the black flag report to the pits immediately or be disqualified.
  11. Any driver violating any of the flag rules will be penalized.
  12. Rough riding WILL BE penalized. If occasion warrants, driver may be fined and/or suspended. All fines and suspensions are at the discretion of the track promoters.
  13. All starts are at the cone in turn four (4). All cars must stay in line to that cone. Anyone jumping the start will be penalized. First penalty for jumping any start is two (2) positions either at the next caution or at the end of the race. Second time to the rear, third time to the pits.
  14. In the event of a caution before one (1) lap is completed, it will be considered an original restart except for the car(s) involved in the caution. Any cars in the caution must go to the rear.
  15. All restarts will be double file until the halfway point of the race. After half way, restarts will be single file. If during double file restarts the field does not complete a lap in two (2) tries, field will be lined up single file for the remainder of the event.
  16. The race leader has choice of inside or outside on restarts. NOT the original start. The leader paces the start either on the inside or outside.
  17. When the caution comes out all cars are to get single file. This is so the scorers can review the line-up and to make it easier for safety and wrecker crews to attend to an accident.
  18. The scorer will communicate with the drivers and track officials as to what the correct line up is. Anyone that challenges their position will be sent to the rear.
  19. No driver is permitted to stop at the flagger stand for any reason. The only time a driver should communicate with a track official during a race is for debris on the track or some other unsafe situation. Pull to the inside of track and talk to one of the corner flaggers.
  20. There may be a time limit put on feature events for curfew or threatening weather reasons. You will be notified before the start of your feature if this is going to be enforced.
  21. Any competitor that uses their car at any time for retaliation purposes will be disqualified for that event and possible suspension and/or fines.

 

WEIGHING

  1. At the end of each feature event the top five (5) cars are to report directly to the scale area in the infield. Cars that are supposed to report to scales and do not will be disqualified. Scorer will notify the cars that need to report to scale area.
  2. On occasion there could be a random finishing position drawn to be weighed at the end of the feature also. That car will be told on the radio after the race or may be determined before the feature events start.
  3. Any car tampered with before weighing will be disqualified.
  4. All weights are dry with driver, just the way you finished the race. If car is underweight, we will weigh the rest of the cars and give you a second chance without leaving the scale area. If underweight on second reading you will be disqualified.
  5. Track scales are official. NO tolerance. No protest or appealed allowed.
  6. Any car can voluntarily be weighed when the scales are open, preferably before heat races start. Voluntary weights will only be shared with the driver.
  7. The first car to cross the scales must be the winning car before going to victory lane.

 

RADIO COMMUNICATION

  1. One-way radios are MANDATORY in ALL divisions racing at Thunder Mountain Speedway.
  2. Radio frequency used by the speedway for drivers is 454.000
  3. Cars not equipped with one-way radios will not be able to compete.
  4. One-way radios are used by scorer and track officials to communicate with drivers, for line ups and cautions. Also, for any driver that is to be penalized for an on-track incident.
  5. Under caution ALL cars are to get single file, track scorer will radio any wrong positions. Any drivers protesting their restart position will be sent to the rear.
  6. Any car stopping on the track to protest a restart position will be sent to the rear.
  7. Radios are considered a working part of the race car. Be sure that they are working. Track will run periodic test.
  8. No two-way radio communication between driver and crew.

DUMPING OIL AND TIRES

  1. The law prohibits the dumping of oil or leaving old tires on the speedway premises. Track will supply a barrel to dump used oil in at the pit shack.
  2. Any race team found dumping oil on the grounds will be fined $500, disqualified and turned over to local authorities for prosecution. Any team found leaving old tires on the grounds will be fined $200 per tire. Team is suspended until fines are paid.

PROTEST

  1. Only a driver and/or owner may file a protest.
  2. All protest must be in writing and given to the pit steward within ten minutes of the conclusion of the event. The written protest must state exactly what is being protested on the car in question. Only one (1) particular part per protest. Written protest must include money.
  3. Any crew member interfering with the protest process will cause the protest to either be disallowed or disqualification of the protested car depending on which car the crew member is from.
  4. Results and findings by track officials will be final.
  5. Depending on the infraction, car may be disqualified and scored as such. Also, will have to be re-inspected and any fines paid in order to race again.
  6. If a formal protest is made, the payoff may be delayed until the protest is satisfied.
  7. Any finishing order discrepancies must be made within ten (10) minutes of official posting at the pit board to the pit steward. A check of the scoring will be reviewed and the official finish will either be recertified or corrected.
  8. Any protest deemed retaliatory or lacking substance may be disallowed at the discretion of track officials and/or promoters.
  9. Visuals inspections and protest must be done before the event begins.
  10. Protester must be in top 5 finish and state what is being protested.

PROTEST FEES

  1. Internal Motor Part: $1500 ($1400 to protested car if legal, $1500 returned if illegal)
  2. If protesting the crank, rods will be included. $1500
  3. If protesting the heads, intake will be included. $1500
  4. When heads are removed, if pistons aren’t illegal the head protest will include them.

 

 

 

 

OPEN MODIFIED 

BIG BLOCK-SMALL BLOCK (OVER 358 CD) ENGINE SPECIFICATIONS

(Afton Speedway allows various engine combinations. This is a guideline for the more popular).

 

ENGINE

  1. Any Steel/Cast block
  2. Aluminum blocks WILL NOT permitted.
  3. Only normally aspirated engines are permitted.
  4. Maximum displacement of 467 cu.
  5. No reverse rotation engines.

 

CARBURETOR

  1. Any 4-barrel carb, limited to 1

 

INTAKE MANIFOLD

  1. Optional as to design or manufacturer, but the manifold must allow for the mounting of only one 4-barrel carburetor.

 

CYLINDER HEADS

  1. Any 2 valve per cylinder head.
  2. Optional as to design or manufacturer, but must be made of cast aluminum or cast iron only.
  3. Valve sizes are optional.
  4. Any form of porting is permitted.
  5. Titanium valves and retainers are permitted.
  6. No hollow stem valves or liquid cooled valves are permitted.
  7. Only 2 valves per cylinder are permitted
  8. Only one spark plugs per cylinder

 

CAMSHAFT

  1. Optional as to design or manufacturer, Raised cam or “Rocket Block” Allowed
  2. No overhead cams are permitted.

 

PISTONS/RODS/CRANKSHAFT

  1. Any 3-ring piston, any steel connecting rod/crankshaft – no titanium.

 

IGNITION

  1. Any kind of ignition is permitted, as long as it is mechanically driven in the stock position.
  2. Crank trigger ignition systems are permitted. If using a crank trigger, spark must be distributed through a factory located distributor
  3. Only one ignition coil and one ignition box (amplifier) are permitted on the car.
  4. Only one spark plug per cylinder is permitted.
  5. Traction control devices are not permitted. Traction control devices that use the brakes are also illegal.
  6. Ignition boxes must remain as manufactured with no internal or external alterations. NOTE: Ignition boxes may be swapped or confiscated by Speedway at any time.

 

LUBRICATION SYSTEM:

  1. Conventional or dry sump may be used.

 

FUEL:

  1. Only racing fuel or pump gas is permitted – small block under .360 C.I. can run alcohol.
  2. No nitrous or any other additives are permitted.
  3. All fuels are subject to random testing at each track.
  4. No electric fuel pumps are permitted.

 

WATER PUMP

  1. Water pump must be cast iron or aluminum.
  2. No electric cooling fans or pumps allowed.

 

Any infraction of the engine or fuel specifications as mentioned above may result in disqualification, suspension and/or fines.

 

MODIFIED RULES & SPECIFICATIONS

 

  1. Only round steel roll over bars may be used. Front and rear roll bars must be connected at top in a cage type configuration. Two round horizontal side bars on each side are mandatory. The topside bar must be a maximum of 20” below the top roll bar. Proper bracing and triangulation on front and rear roll bars are required. All roll bar bracing must be a minimum of 1-1/2” diameter by .095” wall thickness. A minimum of one diagonal bar across the top of the roll cage is mandatory.
  2. The rear main roll bar hoop must be a minimum of 26” measured across from outside to outside of tubing and must maintain that measurement from the bottom all the way to the top of the cage. Bottom of the rear roll bar must be directly welded to the 2 x 4 frame (no outriggers). The front roll bar must be measured and constructed the same way, except that the allowable taper in the frame rules will govern the width dimension. Only two roll bar diameters will be permitted. Roll bars of 1 3/4” diameter will require a minimum of .095” wall thickness. Roll bars of 1-1/2” diameter will require .120” wall thickness.
  3. The roll cage must be integral with the frame. All frames built in 2005 and later must have a manufactures serial number plate prominently attached by welding on the left side front roll cage upright. The letters and or numbers shall not exceed 8 digits and be ½” in height.
  4. A minimum clearance of 1-1/2” is required between the top of the normally seated driver’s helmet and the underside of the horizontal roll cage bars.
  5. Shock resistant roll bar padding must fully cover all bars that may come in contact with the driver’s head while strapped in the seat. On center type steering, all housings, lines, and fittings must be covered with shock resistant roll bar padding. The steering wheel center must also be padded. The starter housing and any other points of contact that could potentially injure the driver must also be adequately padded. It is recommended that this padding is flame retardant.
  6. All cars must have a functional padded head rest which must be in line with center of driver’s head, if not built into the seat.
  7. Adequate window openings on both sides of the car must be maintained for emergency exit of the driver. The minimum opening size is that which will allow a rectangular box with dimensions of 12” high by 18” wide by 30” long to be passed through the inside of the car from one window through to the other side. Any obstacles other than the driver’s head rest, which prohibit the passage of the inspection box through the cockpit, must be removed.
  8. All cars must have a drive shaft cover. All cars with open drive shafts must have a tunnel, made from a minimum of 1/8” thick steel which extends from 2” under front edge of seat to the back of the transmission covering the shaft and “U” joint, and output flange on top and both sides. It must extend completely down to floorboards. It must be held in place with a minimum of four 3/8” diameter bolts at bottom connected to a substantial cross-member. This drive shaft cover must be a solid unit with no cut-a ways for lightening purposes.
  9. Two steel safety rings diameter to suite x 1/4” wall thickness x 2” wide, each fastened by two 3/8” grade 5 bolts to the torque arm side plates or the frame must be installed around each universal joint.
  10. Closed drive type cars, torque tubes, or bells that already have a 360 degree covering from “U” joint back to seat will be accepted as is. To protect the driver, any suspension link such as a torque arm, coil over or trailer bar inside the driver’s compartment must have a steel cable (1/4” in diameter or more) or clamp connecting it to a substantial cross-member to limit its range should it break loose. These parts must have no sharp edges and must be padded.
  11. Firewalls, both front and rear are mandatory. The rear firewall must extend from the top of the fuel cell to the belly pan to isolate the driver from the fuel cell. A minimum thickness of .050” aluminum or steel is required. A minimal amount of sheet metal may be cut out for drive shaft clearance. The front firewall must fully isolate the driver from the engine compartment.
  12. Belly pans are mandatory and must extend from front firewall to rear firewall and be attached at both spots. It is mandatory to have a separate floor to protect the driver’s feet in the event the under pan falls off. This extra floor must be attached to the frame or cross-member or both, and extend from the front firewall past the front edge of the seat.

 

SEAT AND SEAT BELTS

  1. All cars must be equipped with 5-point seat belts to SFI 16.1 specifications. All belts must be securely fastened to the frame or cage. Bolts may not be inserted through webbing for mounting. Seat belt webbing that comes into contact with any sharp or un-radiused metal edge must be protected from that edge by means of push on grip vinyl trim. The areas of concern are the webbing slots in the metal racing seats all the seat manufacturers either roll the edge or supply the seat with trim protecting the webbing from abrasion or cutting under impact conditions. Webbing entry slots into the seat with an existing metal roll of 1/8 inch smooth radius will not require vinyl trim.
  2. The areas where the webbing slot has been enlarged by filing or cutting are of particular concern. In most instances the edges have been left sharp, increasing the incidence of belt failure. As racing seat belts are subjected to severe conditions, it is required that worn/frayed belts are replaced immediately, we encouraged that undamaged belts are replaced every 36 months. The date sewn into the webbing should be used as a guide. Belts older than five (5) years old will not be permitted for the 2011 season. Damaged belts will absolutely not be permitted.
  3. Driver’s seat must be securely fastened to frame or cage in six spots, with a minimum of six 3/8” bolts, four on bottom and two on the seat back. All seats must have a minimum 1/8” steel plate under and up the back 4” and be as wide as seat. The seat must be one-piece high back type only. The seat must be made of aluminum only (no fiberglass). A full containment seat or aftermarket bolt on head restraint is highly recommended.

 

DRIVER’S EQUIPMENT

  1. All drivers must wear a SA 2005 or newer SNELL approved full-face helmet.
  2. All drivers must wear a clean one- or two-piece SFI driver’s suit, quilted or with underwear, head socks, gloves, foot socks and shoes.
  3. Arm restraints are highly recommended. Neck braces are mandatory.

 

FUEL

  1. All crews must carry an operable fire extinguisher of 20 pound marked with the car number in 2-inch numbers/letters in the rear of their transporter, capable of extinguishing gas and oil fires!
  2. On board “flame-out” systems fitted in the race car are recommended.
  3. A fuel cell with a maximum capacity of 24.5 U.S. gallons is mandatory. No pressure tanks are permitted on fuel systems.
  4. The fuel cell must be fully encased in a steel container with a minimum thickness of 20 gauge. An optional aluminum container may be used with a minimum thickness of .060”. The cell must be fully foamed with just a minimal cut-out for filler. Cut-out may be no larger than 6” wide by 10” long by 7” deep. Fuel lines must siphon from the top only. There must be a one-way safety valve in the vent line. Fuel tank must be mounted behind driver. Fuel tank must be secured by at least two steel straps (each strap must be a minimum of 1” wide) and bolted with at least (2) 5/16” diameter grade five bolts.
  5. Fuel cells should be to SFI 28.1/.2 or FT3. No fuel cell bladders may be older than 5 yrs from date of manufacture.
  6. A horizontal bar with minimum dimensions of 1” by .095” wall thickness must be mounted behind the fuel cell for rear impact protection.
  7. No racing fuel in drums may be brought on to track premises.
  8. A fuel shut-off valve must be mounted within easy reach of the driver and the safety crew. It must be labeled in a clearly visible location with words FUEL ON /OFF with a bright colored paint or decal.
  9. A minimum of two throttle return springs and a steel toe loop on gas pedal are required. Throttle return springs must be mounted in two different locations.
  10. Fuel tank height: 12” minimum from the ground to the bottom of the tank.
  11. Tank must be centered inside of the frame rails, be rectangular or square in shape on all sides for measuring capacity. The capacity will be measured as a maximum of 5660 cu. in. using the formula with all sizes of the metal container measured externally in inches. Length minus ½” x width minus ½” x depth minus ½” = no greater than 5660 cu. in.
  12. Tank panels may not be bowed out or bellied to increase capacity. No tolerance.
  13. Tanks or lines may not be altered in any way to increase capacity. No large or long fuel lines, no oversize filter housings or fuel coolers.
  14. No fuel lines larger than #10 permitted. No auxiliary tanks, no fuel filters with more than ½ quart capacity.
  15. Fuel tank vent line must have an inline one-way valve to prevent spillage.
  16. Only one carburetor fuel log will be permitted and is limited to a maximum 1” O.D. dia.

 

ANCILLARIES

  1. All cars must have an ignition switch, which is easily accessible within the driver’s compartment. The ignition switch must be marked ON/OFF with a bright colored paint or decal and be clearly visible and easily accessible to the safety crew.
  2. Fuel lines, power steering lines, and fittings running through the driver’s compartment must be made from an approved braided type line only. No plastic or glass fuel filters permitted. High pressure lines and fittings or hot fluid lines running through the driver’s compartment must be encased or shielded by a deflector to prevent driver injury.
  3. All cars must at all times have four-wheel hydraulic brakes in good working order. Brake tests may be held throughout the year.
  4. Rear wheels must have a minimum of five lug nuts. A minimum of three lug nuts is required on front wheels only. No knock off hubs is permitted on any wheel.
  5. Exhaust headers must be safe for the driver and exit past the driver’s seat.
  6. All exhaust pipes must exit facing the rear of the car and be directed in such a way as to disturb as little dust as possible. Pipes may not exit through the doors or in front of the rear tires.

 

BODY

  1. No mirrors or reflecting devices permitted.
  2. Inspectors reserve the right to request body or sheet metal to be replaced and painted if it has any sharp edges or is not looking presentable to the sport.
  3. No oil cooler may be mounted external to the bodywork. All oil cooler piping shall be routed under the bodywork, as safely away from driver as practical.
  4. Oil coolers may be no further forward than the centerline of the rear axle. The cooler must be horizontal and flush with the cut out in the deck.
  5. Oil coolers with a duct covering them on both sides and the rear may be mounted further forward than the center line of the rear axle.
  6. Oil coolers may be mounted under the hood ahead of the motor.
  7. Maximum rear spoiler height, regardless of ride height, may not exceed 50”. This height will be randomly measured during an event. Cars not in compliance will be excluded. It is suggested that manufactures do not make tall cars that can only pass tech at low ride heights. The following race car driver must be able to see through for clear view of track ahead.
  8. All cars must have a full steel windscreen (rock guard) of substantial material with a maximum individual hole opening of 2” by 1” by 1/16” (no chicken wire or aluminum). Screen must cover entire windshield area left to right across the cage and from top of cage down to hood or cowl. Clear Lexan or safety glass windshields may be used for additional protection if they are in the driver’s line of sight. They must be shatterproof and mounted behind the screen enabling driver to wipe them clean.

Any additional windshield must not obstruct the emergency exit of the driver.

BODY STYLE AND DIMENSIONS. ALL MEASUREMENTS MAY BE TAKEN WITH OR WITHOUT DRIVER AND OR WITH OR WITH OUT FUEL. TOLERANCE PERMITTED ON ALL BODY DIMENSIONS IS MAXIMUM ½” (ONE-HALF INCH). THIS IS A TOLERANCE. NOT A DIMENSION TO BE ADDED TO THE BODY DIMENSIONS.

 

BODY MATERIAL

  1. Only aluminum or steel will be permitted for all inner and outer body panels.
  2. A maximum of 4” vertical plastic material extending below the metal body panel is permitted. The plastic thickness shall be between .090’’ and .125’’ and an overlap of 2” to secure to the doors/door extensions will be permitted. Doors/door extensions must still have a minimum of six inches of ground clearance including plastic material
  3. The overall dimensions of the doors and door extensions must meet the specifications.
  4. The roof must be fiberglass only.
  5. Hood, hood scoop, windshield cowl, right rear inside tire clearance cover and front spoiler may be constructed of either fiberglass or aluminum.
  6. Only CLEAR Lexan will be permitted for the rear spoiler and the rear wing windows. NO STICKERS OR WRITING WILL BE ALLOWED ON THEM!

 

ROOF

  1. The roof must be centered from side to side on roll cage and also be centered on frame (No offset bodies). Leading edge of roof must be fastened in a stationary position a minimum of 33” and a maximum of 48” in front of rear axle centerline. The roof must be securely fastened at the back and on both ends.
  2. Length of the roof: maximum 60”, minimum 48”. Width of roof: maximum 52”, minimum 48”. It must display a turtleback style and shape with at least 3/4’’ belly front to rear and 3/4” side to side. The roof contour must fit roof template patterns left to right and front to back (NO FLAT ROOFS). Front lip may not be more than 1/2’’. Side edges may be no longer than 11/8” break.
  3. The roof cannot change shape or location while racing.
  4. Overall height (top of highest point): minimum 52”, maximum 61”, measured from the ground. Maximum roof angle is 5 degrees.
  5. The roof must be one-piece fiberglass only and be a single ply, one contour inside and out. No carbon fiber. Roll bars must be exposed. No vertical metal used to mount roofs will be permitted covering the roll bars. The roof must weigh a minimum of ten pounds.

 

FRONT DOOR POSTS

  1. Door posts must be flat aluminum sheet metal only. They must go in a straight direct line from the roof to the doors. From a side view they must be seen as a 2” dimension. They must be no wider than 2”. They may be bead rolled or have a lip for re-enforcement, but can’t exceed a 3/8” maximum thickness at that area. The material thickness used may be a minimum of .050” to a maximum of .090” inches. Only a one-piece construction will be accepted! There will be no Tolerance on these measurements. Door-posts must attach securely to the metal roof support and doors! They may be bolted with a min. of (2) 3/16” bolts to the door bracket for the ease of fabrication.
  2. No Lexan vent windows or excessive sheet metal will be permitted in the vent corner where the post meets the door panel.

 

BODY WIDTH AND GROUND CLEARANCE

  1. Body width (measured anywhere along the body line, front or back): 68” maximum, 64” minimum.
  2. Minimum chassis ground clearance 2 1/2”.
  3. No fan or ground-effects cars are permitted.
  4. No rubber skirts, fins, or spoilers of any description are permitted under the car.
  5. A 2” max air deflector is permitted in front of radiator to facilitate cooling.

 

DOOR PANELS

  1. Side door panel: minimum 60”, maximum 70” in front of centerline of the rear axle. Doors, front door extensions and rear quarter panels must be flat and mounted in a vertical position. They must remain flat with no louvers, bead rolls, holes or protrusions from top to bottom. The exception being for rub rails. Doors may have a max. Of a 1” long lip at a 45-degree outward angle 1/2” away from the sheet metal for the purpose of reinforcement. This will be allowed at the top and bottom of the panels. All outside sheet metal, door panels, door extensions, air dams, front nose & hood fins must be the same shape, size, and angle on both sides of the car. Doors must match each other from side for side. (Must be symmetrical)
  2. Bead rolls around the outside perimeter of these panels and the wing windows will be allowed. Bead roll edges must face towards center of chassis.
  3. Front door extensions will be permitted up to 20” behind the front axle centerline.
  4. Front door height must be a maximum of 38” and minimum of 30” from the ground measured at 60” from rear axle centerline.
  5. Ground clearance on the bottom of the doors must be a minimum of 6” and a maximum of 12” from the ground.
  6. All doors and rear quarter panels may have a maximum lip of 1 1/2” rounded at 90 degrees and facing inward only, on the top and the bottom.
  7. At the top of the doors and rear quarter panels, a lip angled out at a maximum of 45 degree, protruding away from the door no more than 1/2” and no more than 1” in length before it bends inward for strength will be permitted.

 

REAR QUARTER PANELS

  1. Rear quarter panels must match each other. (Must be symmetrical)
  2. Quarter panels must be a maximum of 47” and a minimum of 40” from the ground at the rear and continue in a straight line with top of door.
  3. A fender flare, up to a maximum of 2” from the body may be used, but the overall body width must still be maintained at a 68” maximum.
  4. Rear quarter panels can extend back to 48” maximum at top and may incline down to 44” maximum at bottom measured from center of rear axle to rear of car.
  5. Ground clearance on rear quarter panels must be a minimum of 8” and a maximum of 16”.

  

REAR SPOILER

  1. The rear spoiler must be clear one-piece Lexan with a maximum height of 5” from the rear deck and must not have any writing or stickers on it.
  2. The rear spoiler must be non-adjustable (no hinges or slides).
  3. No metal Gurney tabs permitted. Lexan may have brake (top only) for rigidity.
  4. Spoiler maximum height from ground is not to exceed 50”.
  5. A maximum of four vertical supports may be used to fasten the spoiler to the rear deck. These supports may not exceed 2” in vertical height and 10” in length.

 

REAR DECK

  1. Must be a maximum height of 47” and minimum of 40” from the ground.
  2. Rear deck lid (i.e., trunk lid) must be fully enclosed from quarter panel to quarter panel and have a minimum height of 9” and a maximum of 14” in vertical coverage behind the fuel tank.
  3. Left and right rear trunk lids must be symmetrical in size and shape and show no specific bulge or extension to cover fuel filler hose or apparatus within the 9” to 14” of vertical coverage. This panel must completely cover the fuel cell, filler hoses, and vent lines.
  4. Older cars with tall gas tanks may have a step in the deck to accommodate the tank.
  5. The fuel tank must be completely enclosed from the bottom of this panel to the bottom of the fuel cell.
  6. The fuel cell must also have both sides completely covered by sheet metal in addition to the container it is enclosed in. Within these dimensions there can be no openings.
  7. No openings from top of fuel cell to bottom of trunk lid are permitted.

 

HOOD, NOSE, AND FRONT SPOILER

  1. The hood, nose, and front spoiler can be no wider than 36” and no narrower than 24”.
  2. The nose-piece must end at the front of the shock towers.
  3. The spoiler must be separate.
  4. Shock covers or deflectors may not be part of or riveted to the nose or spoiler exceeding the 36” width maximum.
  5. Fabric shock covers are permitted as long as they are used for the prevention of dirt getting at the shock piston and not used for any aerodynamic advantage.
  6. The front spoiler must not extend any more than 20” in front of the front axle centerline.
  7. The front spoiler must be non-adjustable (no hinges or sliders).
  8. The hood shall be considered from the front roll cage to on top and even with the front of the radiator.
  9. The nose piece shall start where hood ends and end at the shock towers!
  10. Both hood and nose may have 2” maximum lip up on both sides following the contour of the body. Both lips must be symmetrical.
  11. The hood, nose, and spoiler may not overlap each other’s location on the frame.
  12. Any part of hood may not exceed 10 degrees nor can sheet metal have an opening or extrusion between the hood and nose.
  13. The hood must extend over the radiator and have complete sides.
  14. Front spoiler may have 2’’ maximum lip up or down on both sides following the contour of the spoiler, not exceeding the maximum width of 36 inches

 

HOOD SCOOP

  1. The hood must be fully enclosed.
  2. Two options of hood scoops mounted on top of the hood for the purpose of enclosing the carburetor, or ram air will be permitted providing they meet the following specifications.
  3. Both style scoops may be made of fiberglass.
  4. Ram air type scoop: Maximum length, 30” measured from rear motor plate to front of hood scoop. Maximum width 18”. The front vertical opening of the scoop can be a maximum of 6” at the beginning of the scoop only. The overall height of this scoop must maintain a minimum of 8” of vertical vision for the driver. This measurement will be taken from a horizontal line from the highest point of the hood scoop to the lowest point of the front roll cage and/or roof. Hood scoop must be fastened to the hood and completely enclose the carburetor and air filter.
  5. The conventional no ram air scoop: a maximum of 25” is permitted from center of the carburetor forward to end of scoop.

The width permitted is a maximum of 22”. The height must maintain a minimum of 8” of vertical vision from the top of the scoop to the lowest point under roof or roll cage, and completely enclose the carburetor and air filter.

 

INTERIOR SHEET METAL

  1. Any horizontal body support, other than the inner pods, whether in front or rear must be a maximum of 1” deep by 1” thick tubing or flat stock only.
  2. No inside or outside wings, spoilers, air foils, or wind deflectors are permitted.
  3. No double panels that create a wing effect will be permitted.
  4. A 1” maximum reinforced lip will be permitted on all Lexan, but all specified measurements must still be maintained.
  5. All inner sheet metal used must completely cover areas from door to door, quarter panel to quarter panel. No holes or openings are permitted in this area.
  6. No vertical fins, air dams, or fairings permitted on the sides or behind the roll cage.
  7. Sheet metal must be a flat single plane across the inside of the car with the exception of two stiffening bead rolls or stiffening breaks for the purpose of stiffening the wing only. Bead rolls or breaks may not exceed 1/8” in height and ½ inch in width.
  8. No covered roll bars are permitted. Sheet metal that is one-piece and part of a body panel bent around tubing (for purposes of protecting the driver or finishing off panel) is not considered an aerodynamic advantage provided it is not to excess.
  9. No louvers or holes in the interior or exterior sheet metal are permitted with the exception being the cooling of the radiator, engine, and oil cooler.
  10. The floor pan or under pan may not be any wider than the frame, from front to back, and may not have any lips or fins facing downward.

 

NUMBERS

  1. The Track or series handicapper reserves the right to issue or change a car’s number to prevent duplication and maintain proper records.
  2. Team cars must be clearly distinguishable from one another and use a different number or letter.
  3. All numbers and letters will be limited to three digits. If three digits are used, two shall be primary numbers. Numbers are required on roof, nose, rear deck and both doors.
  4. All numbers and letters must be a minimum of 18” high on the roof and doors, and 8” high for the rear deck and nose. All numbers and letters must be of equal size and painted or decaled. If numbers “3”, “6” or “9” are used make sure that they are distinguishable.
  5. Nerf bars must not block visibility of number.

 

DRIVER NAME (Recommended)

  1. Letters of driver’s last name must be a minimum of six inches in height and be positioned under, through or above number on both sides of the car

 

SAIL PANEL (OPEN Modified only)

 

Maximum height when measured from the ground is 65 inches. Sail panels must extend no further forward than the rear of the driver’s seat and no further back than the end of the quarter-panel. A roof spoiler/wicker bill, no taller than four inches, is permitted. Sail panels must mirror size and shape side for side. Louvering of sail panels will not be permitted.

 

FRAME

  1. Only 2 x 4 box frames are permitted between axle centers, front and rear. The 4” side must be vertical. Frame rails must be steel only. All 2 x 4 rails must be .120” wall thickness only. At the discretion of the officials, it may be necessary to drill a 3/16” hole in frame rail for inspection of thickness. No other holes will be permitted. All tubing permitted for the frame rails must be either 1 1/2” dia. x .095” wall or 1 3/4” x .095” wall.
  2. Frame width is as follows: Front (at shock towers): 24” minimum, 35” maximum. Rear: 26” minimum, 35” maximum. The minimum frame width at the rear roll bar must be 26”. All measurements are to be taken from the outside of the frame rails. These measurements shall be taken at both top and bottom of frame at its longest length. Clips, sub-frames, etc. are considered part of the frame.
  3. Minimum length of the 2 x 4 frame rails must start at 14” in front of rear axle centerline and extend to the front of the radiator. All kick up material must be same specifications as the roll cage or frame material. Left and right frame rails (both top and bottom rails) must be equal-distant from the driveline centerline in a vertical plane along the total length of frame. The only exceptions will be the lower left rear frame rail, which will be permitted at 4” maximum indent for suspension clearance, and the two upper frame rails in the engine compartment to allow for the clearance of large cylinder heads.
  4. Titanium or carbon fiber materials are not permitted on the chassis.

 

SEAT

  1. Seat and steering wheel must be centered in the frame.
  2. The seat must be a maximum of 16” from the center of the rear end to back of seat bottom.
  3. A high back seat made completely from aluminum is mandatory. No fiberglass or carbon fiber materials are permitted.
  4. Hans device or its equal recommended.

 

RADIATOR

  1. Only one (1) radiator permitted and it must be centered squarely, not angled, in front of motor in a vertical position.
  2. No plastic or carbon fiber permitted.
  3. No auxiliary cooling tanks or catch cans are permitted in driver’s compartment.

 

ENGINE

  1. The engine must be centered in the front of the chassis and placed in an upright position.
  2. Engine set back: minimum 56”, maximum 66” with 1/2” absolute maximum tolerance. Set back will be measured from the center of the front axle to the rear machined bell housing surface of the engine.

 

TRANSMISSION

  1. Approved North American or Canadian manufactured manual shift transmission only. No automatics are permitted.
  2. No overdrive or underdrive transmissions are permitted.
  3. No running through reduction gears, transmission must be direct drive to rear end at racing speed.
  4. Transmission must have forward, neutral, and reverse gear in good working condition. From a neutral position with the motor running, a car must be able to go forward and backward in a smooth manner.
  5. Transmission must bolt to the bell housing.
  6. The car must start and move under by its own power.

 

DRIVELINE

  1. No chassis, driveline or suspension components made of carbon fiber are permitted.
  2. Two universal joints per drive line maximum.
  3. A drive line shield and 2 steel safety rings are mandatory (see safety rules for detailed requirements).

 

REAR END

  1. Competition rears only.
  2. No hypoid type rears are permitted. (No 9” Ford type rears allowed)
  3. No limited slip type rear ends or hubs are permitted.
  4. No lockers or two speed rears are permitted.
  5. Rear end must have solid aluminum or steel spool only.
  6. Rear spindles may be steel or aluminum only. If aluminum, rear must be a one-piece tube and spindle with a minimum outside diameter of 2 7/8” and maximum inside diameter of 2 1/2”.
  7. Live rear ends with aluminum or steel axles are permitted.
  8. The rear end or chassis must not be offset any more than 4” from center of the inside tire width! This will be measured from the inside of the left rear tire to the inside of the right rear tire, at axle height.
  9. Left or Right internally adjustable rear pan hard mounts are permitted

 

FRONT END

  1. The front axle must be straight, one-piece steel tubing only with no camber adjustments.
  2. No split axle or dropped axle permitted.
  3. All brackets on the front axle must be bolted or welded (no bird cages or slides).
  4. Modified type front spindles only.
  5. It is recommended that bearing shafts be made of steel.
  6. Chassis may not be offset any more than 4” from center of inside tire width, measured from the inside of the left front tire to the inside of the right front tire at axle height.
  7. Front wheels must be fully exposed. No fenders are permitted.

 

WHEELBASE

  1. Wheelbase: minimum 106”, maximum 110”. This measurement will be taken from the center of the rear axle to the center of the front axle, for both left and right sides with a maximum tolerance of 1/2”.

 

TIRES

Only Hoosier Racing Tires will be permitted. Modified: Compound D300, D400, D500

Tire Size and Compound Designation:

Left Front – 11/82-15 Right Front – 13/82-15

Left Rear – 13/87-15 Left Rear – 13/89 – 15 Right Rear – 13/92-15

 

Any type of tire softener will NOT be permitted

 

SUSPENSION

  1. No independent suspensions front or rear.
  2. No “A” frames or ball joints may be utilized for steering axis (kingpin only).
  3. No four-wheel steering permitted that is actuated by steering wheel.
  4. All suspension systems must be mechanical with no form of hydraulic, air, electrical, radio, or computer assistance for adjustments, in or out of cockpit allowed.
  5. With the exception of brake bias and the rear pan hard, no other form of cockpit adjustment is permitted. Example: No in car adjustable front/rear trailing arms, spring rods, or adjustable suspension components of any type
  6. No form of traction control is permitted. Braking system included.
  7. With the exception of brake bias and the rear pan hard, no other form of cockpit adjustment is permitted.

 

SPRINGS

  1. Any form will be permitted (torsion bars, coil-overs, leaf springs, etc.).
  2. No carbon fiber or titanium springs are permitted.

 

SHOCKS

  1. Only one shock per wheel, however additional shock absorbing spring rod is permitted
  2. Shocks may not be externally adjustable.
  3. External reservoirs are not permitted.
  4. Manufacturers must submit shocks for approval 2 weeks prior to being raced.
  5. All shocks used MUST be freely available to all competitors. Failure to easily purchase a type of shock could result in those shocks not being permitted.

 

BRAKES

  1. All cars must have four wheel hydraulic brakes in good working condition.
  2. No carbon fiber, carbon, titanium, ceramic or aluminum pads or rotors are permitted.
  3. On live rear axles, one inboard and one outboard brake assembly is permitted.
  4. Brake tests may be conducted throughout the year.
  5. Brake bias may be cockpit adjustable.

 

FRONT BUMPER

  1. Must be made from round steel tubing only, with a minimum diameter of 1 1/4” by .095 wall thickness for main bumper and all bracing.
  2. It must consist of two rails, an upper and lower and at least 1or 2 vertical braces equally spaced. These rails must have four sockets or supports attached to the frame.
  3. The four tubes that support the bumper from the four frame sockets must be horizontal. These rails must also be a minimum of 6” apart and a maximum of 12” measured from top to bottom and maintain that measurement for a minimum width of 24” or a maximum width of 30”. It must also have an 18” center measured from the ground up to the middle of the bumper.
  4. The front bumper may not extend more than 24” in front of front axle center centerline.
  5. No V-shaped bumpers, crash area must be flat and vertical for the full width of bumper.
  6. The bumper must have all rounded ends and no sharp edges.
  7. The end bracing tubes of the bumper must be angled in such a way as to prevent the bumper interlocking with another cars bumper.

 

REAR BUMPER

  1. The rear bumper must be made of round steel tubing, with a minimum diameter of 1 1/2” by .095” wall thickness for main bumper and all bracing.
  2. It must consist of two rails, an upper and lower, which must have four sockets and horizontal support bars attaching it to the frame. These rails must also be a minimum of 10” apart and a maximum of 16” measured from top to bottom and maintain that measurement for a minimum width of 64” or a maximum width of 86”.
  3. The rear bumper or any side bars cannot extend past the outside of tire sidewalls on both sides. It also must have an 18” center measured from the ground up to middle of bumper.
  4. The rear bumper may not exceed 52” back of the rear axle centerline.
  5. No V-shaped bumpers, crash area must be flat and vertical for the full width of bumper.
  6. Bumper must have all rounded ends and no sharp edges.

 

RUB RAILS

  1. The rub rails must be made of round steel tubing, with a minimum diameter of 1 1/2” by .095” wall thickness.
  2. All bracing must also be a minimum of 1 1/2” outside diameter by .095” wall thickness.
  3. Maximum wall thickness must be .095” with no solid bars or ballast added inside.
  4. Rub rails must be outside of body panels but may not exceed the outside edge of the tires. The exception is the left rub rail only, which may extend an absolute maximum of 2” outside the left rear tire sidewall.
  5. Rub rail ends must be rounded with no sharp edges and bent at a gradual 90 degrees and must protrude a minimum of 6” back in past the body.
  6. Rub rails must be a minimum of 50” long, socket to socket.
  7. 5/16”attachment bolts with nylon nuts or approved quick release solid pins are the only permitted fasteners. NO COTTER PINS!
  8. All 3 rub rail sockets must be pinned or bolted.
  9. Front and rear rub rails must have a 360 deg. sleeve 3/8” wide x .095” wall min. welded to the rub rail tube butted up against the support socket to prevent pins from shearing.

 

MUFFLERS AND EXHAUST SYSTEM

  1. Each car must have one unaltered muffler per bank.
  2. Mounting position front to back will be optional however the exhaust must exit past the driver.
  3. Each muffler must have a tail pipe no less than 10” long measured off the back of the muffler and must direct the exhaust to the rear of the car only so as to disturb as little dust as possible.
  4. No exhaust pipe may face outside the car.
  5. Modified – any manufacturer of exhaust header is permitted, but header material is limited to steel or stainless steel from the 300 series.
  6. Approved mufflers mandatory.
  7. Header collector extension pipe and tail pipe must not be inserted past the muffler inlet or outlet flange.

 

BALLAST WEIGHT

  1. Any ballast weight used must be mounted within the vertical planes formed by the frame rails, must be securely fastened, and must remain stationary while racing.
  2. Weight may be added prior to the event or time trial.
  3. No weight pack may exceed 75 pounds.
  4. All weight packs must have a minimum of two 1/2’’ securing bolts/studs of grade 5 or higher. These bolts/studs must be securely anchored to the frame by a suitable clamp.
  5. No bolts / studs welded to the frame will be permitted.
  6. Clamp around weights is permitted.
  7. All weights must be painted white and carry the car number in a legible fashion. White duct tape marked with a wide black sharpie is acceptable for a one race grace period only.
  8. No ballast weight may be mounted to roll cage above rear deck.
  9. No ballast weight of any kind should be attached to axel tubes or rear ends. No exceptions.

 

BATTERY

  1. Modified and Sportsman: One American Passenger Car sized battery up to 12 volts is permitted. The battery voltage must not measure more than 14.3 volts.
  2. The Battery must be properly secured and must have top and terminals completely covered by rubber.
  3. Battery must be mounted inside the frame rails.
  4. NO step up transformer or any other devise that increases the voltage is allowed.
  5. A battery shut off switch is mandatory. Must be clearly labeled ON/OFF. The switch must be mounted on the left side inner panel (above steering post). The knob must be outside the panel clearly visible and easily accessible. It must be wired to cut off the HOT (positive +) side of battery.

 

WHEELS

  1. Modified: Only aluminum wheels are permitted. No magnesium, steel, or carbon fiber is permitted. Bleed-off valves are permitted.
  2. Sportsman: One piece steel or aluminum wheels.
  3. Rim width restricted to 14” maximum. This is measured from inside of left bead to inside of right bead on the wheel. Wheel diameter limited to 15” only.
  4. Bead locks are permitted. Any wheel or bead lock that is used must maintain a minimum diameter of 11” hole inside bead lock and wheel. Bead locks may be outside only,
  5. Foam inserts or corrugated plastic (with approved installation) may be permitted when track conditions warrant. No unsafe wheel covers are permitted. Wheel covers that are fastened by way of dzus (or similar type fasteners) are permitted.

 

MINIMUM WEIGHTS

Modified:

Minimum Weights, including driver- no fuel added:

  1. Under 361 cu. in. on gas 2400 lbs.
  2. Under 361 cu. in. on alcohol 2400 lbs.
  3. Over 361 cu. in. 2400 lbs.

 

TRACK SCALES ARE OFFICAL, NO TOLERANCE, NO PROTEST ALLOWED.

 

 

DIRTCAR SPORTSMAN

TO ALL COMPETITORS AND PARTICIPANTS

A. Under the guideline of the 2024 DIRTcar rules any and/or rules and as stated in the 2024 DIRTcar Rule Book, all DIRTcar rules apply to all divisions. Local track rules pertaining to the racing procedures and/or overall rules that are administered by the local track officials and management may apply at local tracks in DIRTcar sanctioned events. Instances, where applicable, local track may be applied.
B. All amendments supersede any previous rules regarding any technical article and/or
C. Under the guideline of the 2024 rules any and/or rules and as stated in the 2024 DIRTcar Rule Book, all DIRTcar rules apply to all sanctioned divisions.
D. The specifications published shall be considered a section of the “Official Rules and Specifications” for all events, series and sanctions by World Racing Group. All sections should be considered when determining specifications and governance.
E. ANY CAR, TEAM AND/OR DRIVER THAT DOES NOT MEET THESE SPECIFICATIONS AND/OR EQUIPMENT REQUIREMENTS WILL BE SUBJECT TO PENALTIES AS DETERMINED BY THE Super DIRTcar and/or DIRTcar and/or World Racing Group OFFICIALS.
F. Any new components, including engine components, body designs, frame designs and/or components of any type utilized in competition must be approved by World Racing Group, Super DIRTcar and DIRTcar Officials prior to being introduced into competition.

Section 1 – Engines

A. General

a. The General Motors (GM) / Chevrolet Performance Engine 602 is the only engine permitted in all DIRTcar Sportsman Modified events. The 2024 GM part number is #19434602, engine part number is subject to change.
b. The engine and all components must remain in their original configuration and form as purchased and/or delivered from the factory. Any alterations to the engine will not be permitted, including treating or coating of any parts. The Engine must remain as manufactured by General Motors with a stock 4”-inch bore. Overbore(s) will not be permitted.
c. All engines are to remain sealed from the factory or have DIRTcar, RYR or Pace Performance cable seals. The original factory seals or DIRTcar, RYR or Pace Performance cable seals must remain unaltered, tampering, removal, modifications of any type and/or broken factory seals will not be permitted. The GM Engine must remain unaltered in any way.
d. The GM Crate Engine seals (bolt-type/bottle cap) must remain unaltered, tampering with and/or alteration of any seals will not be permitted and is subject to immediate penalty and/or suspension.
e. Only GM replacement parts of any type will be permitted for any type of replacement and/or repair work. Only GM Crate Engine specific valve springs may be used for replacement and/or repair, Part Number # 10212811/19154761.
f. The engine must be centered between the frame rails in the front of the chassis and placed in an upright position.
g. Engine set back will be as follows; Minimum is 56”-inches and a Maximum of 66”-inches with a tolerance of ½”-inch (+/-). The setback will be measured from the centerline of the front axle to the rear-machined surface of the engine where the motor plate is attached to the motor.
h. GM Crate Engine repairs must be authorized through DIRTcar Authorized Repair Centers, Don Blackshear and DIRTcar Technical Inspector. GM Crate Engine repair procedure works as follows:

i. Contact a DIRTcar Authorized Repair Center and/or DIRTcar Technical Officials before any sealed components are removed.
ii. The DIRTcar Technical Officials will provide a list of DIRTcar Authorized Repair Center locations, or they are listed in 19.1.EV.
iii. Based on the estimate and the detail of the repair, DIRTcar Authorized Repair Centers and Don Blackshear will determine if the repairs may be made or if a new engine must be purchased.
iv. If a repair is approved, the Authorized Repair Center will perform all repairs to the GM Specifications.
v. Upon completion of the repair(s) the engine will be ‘resealed’ before being released for competition.
vi. Bead blasting and/or any polishing and/or any alteration to the intake manifold and/or cylinder heads will not be permitted.
vii. All engine information regarding repairs and/or engine introduction will be retained by DIRTcar Officials and Don Blackshear, to track and manage engine database, including the driver, serial number, repair, type of repair and/or what type of service was performed to any engine.

i. DIRTcar and/or World Racing Group Supervisory Officials reserve the right to technically inspect, exchange and/or confiscate any GM Crate Engine at any time. Failure to surrender the engine and/or submit the engine for inspection equals disqualification from the event and/or suspension.

B. Engine Verification

a. All motors repaired through the Authorized Repair Centers will have a DIRTcar, RYR or Pace QR coded seal. The QR seal will retain information pertaining to the repaired motor.
b. All current motors with GM Bolts/Bottle Cap seals or previously DIRTcar sealed must go through the verification program at an Authorized Repair Center and have a QR seal attached to the motor.
c. A new motor may also be purchased from Authorized Repair Centers or GM Performance Dealer and be updated to a verified motor with a QR seal.
d. Seals from other sanctioning bodies are not accepted as verification seals.
e. Verification pricing is locked in among all centers at $650 (US) and $875 (Can.) plus needed replacement parts.

Authorized Repair Centers

Petrucci Engines
Carlquist Competition Engines
98 Falls Avenue
Oakville, CT 06779
(203) 297-2815		 Donath Motorworx
4848 Route 20
LaFayette, NY 13084
(315) 677-8116		 Enders Racing Engines
55 County Route 59
Phoenix, NY 13135
(315) 695-4491
Hunts Machine
102 Weaver Street
Schenectady, NY 12305
(518) 372-7177		 LaFrance Performance
16397 County Road 2
Long Sault, ON K0C 1P0
(613) 551-6212		 DRIVR Performance
2925 Nelson
Saint Hyacinthe, QC J2S 2V8
(450) 230-1906
New Generation Engines
563 Highway 20
Fenwick, ON L0S 1C0
(905) 892-3255		 DMO Engines
83 Bridge Street
Plattsburgh, NY 12901
(518) 563-2749		 Hull Motorsports Racing
31 Smith Road
Orange, VT 05641
(802) 371-7027
955 Automotive
4725 Iroquois Avenue
Erie, PA 16511
(814) 897-9559

Crate Engine Program Overseen by Don Blackshear – (724) 977-7424

C. Carburetor / Air Cleaner

a. Only one (1) 650 cfm Holley carburetor, Part Number 4777C or Holley HP Carburetor Part Number
0-80541-1 or 0-80541-2 will be permitted. (*** Note 0-80541-2 uses an 80541-3 main body.)

i. The 0-80541-1 & -2 carburetor must maintain the stock venturi and throttle bore dimensions; the primary and the secondary venturi must be 1 1/4”. The 4777C primary venturi will be 1-1/4” and the secondary must be 1 5/16”.
ii. The carburetor (float bowls and main body) must be Holley original equipment manufactured.
Metering blocks and base plate may be billet aluminum, Holley or after market.
iii. The carburetor must maintain all stock dimensions, including mounting and stud location on intake manifold.
iv. The booster height must remain stock OEM from Holley. Cutting, tumbling and/or polishing will not be permitted.
v. No visible modifications will be permitted to the OEM center section except the addition of the optional billet base plate and metering blocks
vi. The following alterations will be permitted;

1. Holes drilled in the throttle plate for proper idle.
2. Drilling, tapping and plugging of unused vacuum ports.
3. Welding of throttle shaft to linkage arm.
4. Drilling of idle and/or high speed air correction jets.
5. Milling of center carburetor body metering block surface, maximum of .015” on each side.
6. Removal of choke plate and shaft.
7. The jets may be changed as needed.
8. Boosters may be safety wired

vii. Gauge measurements (go/no-go) must meet Holey OEM measurements, including after-market base plates regardless of carburetor temperature at all times.
viii. Jets, bleeds, needle and seat, emulsion bleeds, power valves, accelerator pumps nozzles, accelerator pump cam adjustments and secondary adjustable linkage will be permitted.
ix. Physical alteration of carburetor components and/or parts and/or any alterations, machining and/or reshaping will not be permitted. The use of epoxy and/or coatings of any kind will not be permitted.

b. A WRG approved carburetor roll over plate that prevents fuel spillage in case of a roll over is highly recommended.
Currently approved roll over plate approved as followed,

i. Willy’s Carb & Dyno shop LLC. Part # WCD4000SB
ii. Willy’s Carb & Dyno shop LLC. Part # WCD4002

c. A single unaltered carburetor spacer plate with an unaltered single opening including gasket with a maximum thickness of 1-1/8”-inch will be permitted. A maximum two-inch (2”) non-tapered air cleaner spacer may be added. Tapering, machining and/or any other alteration to the spacer plate will not be permitted.
d. Only a single conventional round type air cleaner housing with one 5” round hole in the center will be permitted. Ram air hood (No forward-facing opening), air box and/or heat shield type devices will not be permitted. The air cleaner must remain in place when the hood is removed. A flat piece of metal may be added and securely fastened to AND LEVEL WITH the hood following the contour of the hood scoop to act as a dust shield. The metal attachment can follow the contour of the air cleaner and is not to go past the centerline of the carburetor. The rear 180 degrees of the bottom of the hood scoop must remain open and not enclosed. The opening behind the air cleaner must extend parallel to the air cleaner, to the rear of the hood enclosure/firewall. There cannot be any metal attached to the air cleaner. Air cleaner must be centered on carburetor.
e. Air cleaners that provide ventilation through the top cover (such as the K & N brand) will be permitted.
f. Air induction plastic carburetor insert and/or other air diffuser devices that direct air into the air intake will not be permitted.

D. Ignition and Battery

a. Only stock OEM distributors will be permitted. The distributor must maintain the factory mechanical advance curve to stock OEM specifications. Alterations and/or adjustments will not be permitted with the exception of welding the advance of the addition of lock out plates to the mechanical and vacuum distributor advance system. The weight plate may also be added to the distributor shaft. Also, a distributor gear shim may be added to reduce shaft end play. When both lock plates are added, mechanical weights and springs are to be removed along with the vacuum advanced canister.
b. The ignition amplifier box (“rev box”) and coil must be mounted under the hood and on a panel behind the air filter shielded from heat (out of the driver’s reach) for ease of inspection. The black wire must be grounded to the motor. When the hood is removed the “rev box” must be clearly visible and not covered.
c. The car must be fitted with one (1) unaltered approved MSD/DIRTcar RPM (rev) limiting box, maximum 6000 RPM. The box must remain operable and in working condition, prior to, during and after all racing events. The MSD 8727CT will be the only MSD/DIRTcar RPM (rev) limiting box permitted for competition.
d. Only the stock OEM H.E.I. distributor, ignition coil and module will be permitted.
e. The wiring must remain as specified by the ignition amplifier box manufacturer.
f. One American Passenger Car sized battery with terminals on top and a maximum of 12 volts will be permitted. The voltage must not measure more than 14.3 volts anywhere in the system. Step up transformer and/or any other device designed to increase voltage will not be permitted.
g. OEM stock firing order must be maintained for all engines. Standard GM Firing Order 18436572.
h. Ignition amplifier boxes, “rev boxes”, RPM limiting chips, may be inspected, confiscated and/or exchanged at any time.
i. The battery must be securely mounted inside the frame rails.
j. All cars must have an ignition switch, which is easily accessible by the driver and/or safety crew and clearly labeled ON/OFF in the driver’s compartment. Motor must not run when in the off position.
k. A battery shut-off switch is mandatory. The switch must be clearly labeled ON/OFF. The switch must be mounted on the left side inner panel (above the steering post). The switch must be outside the panel and easily accessed externally. The switch must be wired to shut off the hot (pos +) side and must not run when in the off position. See diagram in the back of this rule book.
l. DIRTcar and/or World Racing Group officials reserve the rights to analyze and/or switch ignition boxes and/or rev chips at anytime.

E. Lubrication, Oiling System, and Oil Cooler

a. Oil coolers must be mounted under the hood or under the side wings/pods. Oil coolers mounted behind the driver exposed will not be permitted. Oil coolers that are not under the hood must have ducting covering them and remain below the bodywork. Unless mounted under the hood, the oil cooler must be mounted horizontal and flush with the cut out in the side wing/pod.

F. Transmission, Driveline, and Driveline Components

a. Only approved North American and/or Canadian manufactured manual shift transmissions will be permitted. Automatic and/or automatic-type transmissions will not be permitted.
b. Overdrive and/or under-drive transmissions will not be permitted.
c. Running through reduction gears will not be permitted. The transmission must be direct drive to the rear end.
d. The transmission must have working gears. Forward, neutral and reverse must be working. From the neutral position and with the motor running, the car must be able to go forward and/or a backward in a smooth manner. The car must start and move under its own power.
e. The transmission must bolt to the bell housing.
f. Driveline components made of carbon fiber, titanium and/or other materials (considered exotic) will not be permitted.
g. A maximum of two (2) universal joints per driveline will be permitted. No CV Joints allowed.

G. Driveshaft

a. Only magnetic steel drive shafts will be permitted. Titanium and/or aluminum drive shafts and/or drive shaft yokes and/or driveline components will not be permitted.
b. Only one (1) drive shaft connected from the transmission to the center section of the rear end will be permitted.
c. Two (2) driveshaft hoops / closed rings a minimum ¼”-inch thick x 2”-inch wide magnetic steel must be positively fastened by two (2) 3/8”-inch grade 5 bolts to the frame and/or torque arm side plates installed around each universal joint.
d. The drive shaft must have some type of drive shaft cover/shield. Cars with open drive shafts must have a drive shaft tunnel a minimum of 1/8”-inch thick by 6” wide magnetic steel extending from 2”-inches under the front edge of the seat and up the back of the seat 4” covering the transmission, drive shaft and the universal joint(s) and output flange on top and both sides. The tunnel must extend down to the floorboards. The cover must be positively fastened with a minimum of four (4) 3/8”-inch diameter bolts at the bottom connected to a cross-member. The cover must be a solid unit with no cuts and/or holes and/or removed material for the purpose of weight reduction. The only hole may be for the gear shift control.
e. Carbon fiber, titanium, and/or other materials (considered exotic) will not be permitted anywhere in the car.

H. Engine Cooling System and Radiator

a. Cast iron and Aluminum water pumps will be permitted.
b. Only one (1) radiator will be permitted. The minimum width of the radiator will be 20”-inches when measured from the outside edge(s) of the radiator. The radiator must be mounted vertically in front of the engine. The minimum height of the radiator must be 22”-inches when measured from the bottom of the frame rail vertically and may incorporate the oil cooler to achieve the vertical height. Radiators mounted on an angle will not be permitted. Plastic and/or carbon fiber radiators will not be permitted.
c. Auxiliary cooling tanks and/or overflow cans and/or canisters will not be permitted in the cockpit.
d. The cooling fan for the radiator must be mounted in the stock OEM location on the front of the water pump. Fans mounted to the crankshaft will not be permitted. Electric fans and/or water pumps will not be permitted. No flex style fans allowed.

I. Rear End

a. Only Quick-Change type rear ends will be permitted.
b. Hypoid-type and/or Nine (9”) Ford-type and/or limited slip-type and/or lockers and/or two speed rear ends will not be permitted. Non-Quick-Change Rear Ends not permitted
c. Only aluminum and/or magnetic steel spools will be permitted.
d. Only steel and/or aluminum rear spindles will be permitted. No camber rear-ends allowed. If the rear spindle is machined from aluminum, it must be a one-piece tube and spindle with a minimum outside diameter 2-7/8” and a maximum 2-1/2” inside diameter.
e. Live rear ends with aluminum tubes will not be permitted. All others must be approved.
f. Carbon fiber, titanium and/or other materials (considered exotic) for any rear end component will not be permitted. Tungsten or any other exotic metal are not permitted, in any form.
g. A maximum rear end offset of 4”-inches from the center of the inside tire width when measured from the inside of the left rear tire to the inside of the right rear tire at axle height. Refer to the drawing at the back of this rule book.
h. Aluminum rear end tubes only, with a maximum wall thickness of .410”. Outer diameter cannot exceed 3”.
i. Outer collars (other than to attach bridge cage) are not permitted. Droop chain bracket may be steel, excessively thick or enlarged brackets of any type are not permitted. All other brackets must be aluminum unless authorized by DIRTcar.
j. Drive Axles must not exceed 1.600” diameter and must be made of steel only. No tungsten. Inserts to be slid inside of tubes, made of any material, are not permitted.
k. Ballast inside, attached to, or machined into hubs are not permitted. Maximum hub 10 lbs

Section 2 – Fuel, Fuel Cells, and Fuel System

A. Either meets FT3 or SFI 28.3 requirements and/or Include: a metal container, bladder, foam, top bolted fuel valve plate with flop valve or roll over check valve OEM cap. The fuel cell must have a maximum capacity of 24 US gallons and must remain in a rectangle and/or square shape for measuring and calculating capacity. The fuel cell must be mounted securely in its container and centered between the frame rails. Pressure tanks on fuel systems will not be permitted. Auxiliary fuel tanks will not be permitted. No dry ice or any other cooling agents will be allowed on the motor during competition. Fuel coolers of any type will not be permitted. A clearly marked fuel shut off valve, labeled On and Off, must be mounted within reach of the driver. It must be labeled with the word(s) “Fuel Shut Off”. Refer to the drawing in the drawing section of this rule book.
B. Only ‘D’-type VP Racing Gasoline, the official fuel of DIRTcar will be permitted for competition. D-98 will be the only specified fuel permitted at any sanctioned DIRTcar Series event. In addition a maximum “94 octane, R+M/2” standard pump gasoline will be permitted at DIRTcar sanctioned weekly tracks. Blending of fuels or gasoline including race fuels or fuels of different octanes will not be permitted. Fuel additive of any type will not be permitted. Fuel with 15% (E15) Ethanol or greater will not be permitted. Alcohol, methanol, nitrous oxide, nitro-methane and/or propylene oxide will not be permitted. Fuel may be subject to inspection and testing at any time. Proof of purchase for the official fuel of DIRTcar may be required.
C. The maximum capacity of the fuel when measured empty and/or dry will be measured in cubic inches utilizing the standard formula of length (minus ½”-inch) x width (minus ½”-inch) x depth (minus ½”-inch) will be 5,660 cubic inches.
D. The foam in the fuel cell must remain unaltered. A minimal cut in the foam will be permitted in the shape of a square or a rectangle. The cut may be no more than 1,000 square inches. The foam must retain the factory cut.
E. The fuel cell must be enclosed completely in a rectangle and/or square container that is a minimum thickness of 20-gauge magnetic steel. An aluminum container may be used as an option and must be a minimum of .060”-inch in thickness. On the bottom of the fuel cell, a piece of .090-guage material (aluminum and/or magnetic steel – in addition to the existing container) must be used at the bottom of the fuel cell container to prevent bowing and/or deflection. The .090-guage material must have an inspection hole drilled near the center of the piece to measure the thickness of the material. A 1”-inch x 1”-inch x .0625”-inch thick magnetic steel square tubing rack must be fabricated on the top, front and rear sides of the fuel cell container. The square tubing must be a minimum of 5”-inches from the outside edge of the fuel cell on either side. The rack may be fastened to the bottom of the fuel cell can utilizing a piece of magnetic steel angle material that is a minimum of 1”-inch x 1”-inch with a minimum material thickness of .065”-inch magnetic angle steel that is on all four (4) sides of the container/Or the fuel cell must be mounted with a minimum of two (2) .125-inch thick steel straps a minimum of 1” (inch) wide. The straps must cover the entire cell. Fuel cells that are mounted in a square tubing frame will be permitted. A minimum of 5/6”-inch ASTN Grade 8 bolts must be used to mount the fuel cell to the frame. Drilling multiple holes and/or any attempt to lighten any piece within the fuel cell container and/or rack will not be permitted. The measurements taken in regard to the fuel cell container will be measured on an inside-to-inside basis. A tolerance for material thickness will be calculated and permitted for dimensions; however, there will be no tolerance for expansion and/or containers that are larger than the minimum.
F. Only one (1) fuel filter with a maximum capacity of one (1) US quart will be permitted with one (1) carburetor fuel log with a maximum outside diameter of 1-1/2”-inches. The fuel log must remain straight without bends and/or curves and must be a maximum of 16”-inches in length Plastic and/or glass fuel filters will not be permitted.
G. Fuel coolers of any type will not be permitted. No dry ice or any other cooling agents will be allowed on the motor during competition.
H. The fuel cell must be mounted behind the driver rear axle between the rear tires, a minimum of 4”-inches ahead of the rear bumper.
I. The bottom of the fuel cell container must be a minimum of 12”-inches from the ground.
J. The fuel pick up must be positioned on the top of the fuel cell and be constructed of metal. The vent line must have a check valve.
K. For the purpose of inspection, the driver and/or crew must be prepared to drain fuel upon request for inspection and/or measurement.
L. For the Official Fuel of DIRTcar; the fuel provider’s decals must be displayed on both sides of all DIRTcar racecars and a patch is required on the driver’s uniform. Logos and/or the presentation of any other fuel manufacturer and/or fuel refinery on the racecar and/or driver’s uniform will not be permitted.
M. Only one mechanical fuel pump in the stock location will be permitted. Fuel must be delivered through the fuel system from the fuel cell to the mechanical fuel pump. Fuel systems that require a return line, a pressure regulator of any type and/or other volume and/or pressure altering device will not be permitted.

Section 3 – Exhaust, Muffler, and Sound Reduction Devices

A. Schoenfeld headers, model number: 1122BCM, 1122BUCM2 and 1122BCM2, Beyea headers Part # NEDM602, NEDM602US and Henry’s Part # DMMSCT-DL will be allowed. The exhaust headers must be 1-5/8” outside diameter. Tri-Y, step headers, stainless steel, ceramic coated, and/or merge collectors will not be permitted. The permitted mufflers include: Dynomax part number(s): 17223 and 17296; Extreme Muffler part number(s): 31530 and 31230; Beyea part number: MUF3DM. Henry’s DMMS3
B. The header collector extension pipe and tail pipe must not be inserted past the muffler inlet or outlet flange and must exit behind the driver. Maximum of 3” exhaust pipe allowed throughout the exhaust system. No Stainless allowed anywhere in exhaust system.

a. All Spec headers must be able to be separated from the rest of the exhaust system for the purpose of inspection.

C. The complete exhaust system must be sealed. Any type of add on, return system and/or exhaust evacuation system will not be permitted.
D. The exhaust must exit past the driver and the exhaust must flow toward the rear of the car in an upward manner away from the racing surface. Exhaust systems that face the outside of the car will not be permitted.
E. Each muffler must have a tail pipe that is a minimum of 10”-inches long when measured off the rear edge of the muffler. Complete exhaust system must be welded or bolted, band clamps may be added over welded joints.
F. Cross-over and/or the joining of exhaust systems from side-to-side will not be permitted.

Section 4 – Traction Control Devices

A. All electronic and/or computerized wheel spin and/or ignition retardation and/or acceleration limiting and/or traction control devices of any type will not be permitted.
B. Adjustable ping control devices, dial a chip controls, timing controls and/or automated throttle controls will not be permitted.
C. Adjustable restrictor plates will not be permitted.
D. Remote control components of any-type will not be permitted.
E. Radios and/or devices for transmitting voice and/or data will not be permitted, unless otherwise authorized prior to any event.
F. Data acquisition systems will not be permitted.

Section 5 – Chassis and Frame

A. General

a. All frames must be fabricated utilizing 2”x4” rectangular magnetic steel tubing with a .120” wall thickness. Only 2”x4” rectangular box frames between the front and rear axle centers will be permitted. The 4”-inch side of the rectangular tubing must remain in the vertical position No open holes or drilling holes in frame rails will be permitted, Round tubing must be either 1-1/2” outside diameter (if used for main hoop must be .125”) and/or 1-3/4” outside diameter with wall thickness of .095”-inches.
b. Frame width will be as follows; At the front shock towers a minimum 24” and a maximum of 35”-inches. Rear of the car is a minimum of 26” with a maximum of 35”-inches. The minimum frame width at the rear roll bar must be 26”-inches. All measurements will be taken from the outside of the frame rails, at the top and bottom of the frame rails and its longest length. Clips, sub-frames, etc., will be considered a part of the frame.
c. The minimum length of the 2”x4” frame rails begins 14”-inches in front of the centerline of the rear axle and extends to the front of the radiator. The left and right rails (both top and bottom) must be equal in distance from the driveline centerline along the total length of the frame. Offset frame rails will not be permitted. A maximum 4”-inch indent in the lower left rear frame rail for suspension clearance will be permitted. The two (2) upper frame rails in the engine compartment may be altered for engine clearance only.
d. The kick-ups must meet the same specifications as the roll cage and/or frame material.
e. Titanium and/or carbon fiber material(s) will not be permitted on the chassis and/or frame.
f. There must be a minimum of 2-1/2”-inches ground clearance from the chassis at its lowest point.
g. Ground effects will not be permitted.

B. Seat Location and Mounting in Frame

a. The seat and steering wheel must be centered in the frame. Offset mounting of the seat and/or steering wheel will not be permitted.
b. The bottom rear of the seat must be a maximum of 16”-inches from the centerline of the rear axle. Refer to the drawing at the back of this rule book.

Section 6 – Weight and Ballast

A. All cars will be weighed with the driver seated in the car. The minimum weight permitted before and/or after an on track event will be measured by the track scales. The track scales will be the official scales. All cars found to be light prior to any event, time permitting will be allowed to make the necessary adjustments and represent themselves at the scales. The number of cars to be weighed after an event will be announced at the driver’s meeting and/or on the one-way radio. If a car is signaled to go to the scales in any fashion and does not report to the scales at the appropriate time, that car may be disqualified from the event. Any car that is found to be light following time trials and/or a qualifying event will be disqualified from that particular race and may make the necessary adjustments and represent themselves for that car’s assigned consolation event. If a car is found to be light after the feature event, that car will be disqualified from the event.
B. The minimum weight following the completion of any DIRTcar Sportsman race will be 2400 lbs.
C. Ballast and/or weight may not be mounted to the roll cage above the rear deck. All added weight must be securely attached to the frame below the body decking.
D. Frame is defined as the steel welded structure only.
E. Any part that moves or is not a fixed component to the steel frame structure may not be used for any weight attachment.
F. Weights attached to the rear bumper and/or outside the frame will not be permitted.
G. All weights and/or ballast must be positively fastened and mounted within the vertical planes formed by the frame rails and must remain stationary during competition. All weight(s) must have a minimum of two
(2) ½”-inch diameter grade 5 bolts and/or studs passing completely through the weight. Bolts and/or studs must be anchored with a minimum of two weight clamps to the frame. Bolts and/or studs welded to the frame will not be permitted.
H. All weights must be painted white and clearly labeled with the car number on it. Lead or tungsten may be used for ballast, pellets or liquid type weight ballast will not be permitted. All materials must be approved.
I. All added weight(s) must be securely attached to the frame below the body decking.

Section 7 – Body

BODY STYLE AND DIMENSIONS

ALL MEASUREMENTS WILL BE TAKEN WITH DRIVER AND/ OR WITH OR WITH OUT FUEL. TOLERANCE PERMITTED ON ALL BODY DIMENSIONS IS MAXIMUM OF +/- (PLUS OR MINUS) ½”-INCH (ONE-HALF INCH). THIS IS A TOLERANCE, NOT A DIMENSION THAT IS INTENDED TO BE ADDED TO THE BODY DIMENSIONS.

***Note – DIRTcar officials can make a competitor change aspects of any body and/or body panels at any time during an event.***

A. General Body

a. Mirrors and/or reflective devices will not be permitted.
b. A full magnetic steel windscreen and/or rock guard is required. The windscreen and/or rock guard must have an individual hope opening of 2” x 1” with a minimum of 1/16” thickness. Chicken wire type and/or aluminum screens will not be permitted. The windscreen and/or rock guard must cover the entire windshield area across the front of the roll cage and from the top of the roll cage down to the base of the cowl and/or hood. In addition, clear lexan-type and/or safety glass windshields will be permitted. If the lexan and/or safety glass is utilized it must be shatterproof and mounted behind the windscreen and/or rock guard. Any additional windshield must not obstruct the driver’s exit of the vehicle. Recommended is 3 upright, quarter inch bars behind the screen for added strength.
c. Offset bodies will not be permitted, all body panels must symmetrical unless noted in the rule book.

B. Body Material

a. Only magnetic steel and/or aluminum will be permitted for all inner and outer body panels.
b. Vertical material (plastic and/or rubber-type), with a material thickness between .090”-to-.125”-inch and a minimum height of 8”-inches from the bottom of the quarter panel will be permitted, provided both doors and/or quarter panels maintain the same length and height with or without the plastic (symmetrical). An overlap of two (2”) inches to secure the door(s) extensions will be permitted. The door(s) must maintain a minimum of six (6”) inches of ground clearance including the additional material extending below the metal body. The overall dimensions of the door(s) and extensions must meet the specifications.
c. Only a single piece fiberglass roof will be permitted.
d. Only fiberglass and/or aluminum hood, hood scoop, windshield cowl, rear interior tire clearance cover will be permitted
e. Only clear lexan will be permitted for the rear wing windows. Decals and/or lettering will not be permitted on the rear spoiler and/or rear wing windows.

C. Roof

a. A one-piece fiberglass roof, single ply, one contour inside and out will be permitted. Carbon fiber and/or any other composite type materials will not be permitted. All roll bars must remain exposed. Vertical material of any type used to mount the roof that may cover the roll bar will not be permitted.
b. The roof must be centered from side-to-side on the roll cage and on the frame. The leading edge of the roof must be positively fastened in a stationary position a minimum of 33”-inches and a maximum of 48”- inches in front of the rear axle centerline. The roof must be securely and positively fastened on all sides.
c. The minimum length of the roof is 47”-inches with a maximum of 60”-inches. The minimum width of the roof is 48”-inches with a maximum of 52”-inches. The roof cannot be “dished” front to back or side to side. The maximum front lip must be ½”-inch. The maximum side edge(s) must be 1-1/8”-inch break. Refer to drawing on page 86 and 88.
d. Changes to the shape and/or location of the roof at any time during competition will not be permitted.
e. The maximum overall height of the car is 62”-inches with a minimum of 53”-inches measured from the ground.
f. The maximum roof angle is 10 degrees with no tolerance when measured with the DIRTcar gauge. (See reference drawing).
g. Any proposed roof design that deviates from the preceding rules must be submitted to DIRTcar for approval and approved before being presented for competition.

D. Front Door Posts

a. Only a one (1) piece magnetic steel and/or aluminum front door posts and/or ‘A’-pillars a minimum of .050”-inches with a maximum of .090”-inches will be permitted. The front door posts must be securely mounted to the roof and to the door(s). The side of the front door post must measure a minimum and maximum of 2”-inches. The front door post may be bead rolled and/or have a lip and/or flange for re- enforcement, but the re-enforcement must not exceed a maximum 3/8”-inch in width.
b. The door post may be fastened with a minimum of two (2) 3/16”-inch bolts to the door bracket for ease of fabrication. The Door post must not extend past the vertical plane of the door.
c. Additional material, air directional devices, lexan vent windows and/or excessive material will not be permitted in the corner of the front door post, where the post meets the door panel.
d. There will be no tolerance on the front door post measurements.

E. Rear Wing Windows, Side View, and Rear View

a. All rear wing panels and windows must resemble a current production OEM style body. Only manufacture approved rear wing panels and windows will be permitted for competition. Any non-manufacture rear wing panel must resemble and/or meet the criteria as the submitted rear wing panels and/or windows. Any rear wing panel that is submitted for competition must not exceed 815 square-inches in total area. All rear wing panels must be submitted for approval prior to introduction into competition.
b. The upper profile must not extend above a straight line projected from the rear of the roof to a point 3”- inches higher than the rear deck. A minimum 2”-inch indent in the profile, so as not to make the panel a fast back is mandatory. (Please refer to the drawing and photographs)
c. The maximum base length will be 61”-inches. The left and right must be of the same style and dimensions (symmetrical). (See example of Body Style Drawing)
d. All rear wing(s) must have an opera-type window. The window must be lexan. Lexan and aluminum must have one continuous, curved bow. Bends or breaks in the Lexan area of the window will not be permitted. Lexan must also be the bulk of the space.
e. Decals and/or lettering will not be permitted on the rear windows.
f. The rear view of the wing window must go in a straight line from the top of the quarter panel (tangent) or bodyline to the roof with a maximum gradual bow of 2”-inches in the center of the wing window.
g. Flanges and or additional material added to the rear window panel for the purpose of directing air flow will not be permitted.

F. Body Width and Ground Clearance

a. The body width, when measured at any point along the body line from front-to-back will be a maximum of 68”-inches and a minimum of 64”-inches.
b. A minimum chassis ground clearance of 2 ½”-inches will be permitted.
c. Fan and/or ground-effect cars will not be permitted.
d. Rubber skirts, fins, air directional devices and/or spoilers of any type under the car will not be permitted. A 2” inch maximum air deflector in front of the radiator for engine cooling will be permitted.

G. Door Panels

a. The side door panel(s) will be a maximum of 86” inches and a minimum of 60”-inches in front of the centerline of the rear axle when measured along the top plane. The door(s), front door extensions and rear quarter panels must be flat and mounted in a vertical position. They must remain flat. Flanges at a 90-degree angle may be added to the front of the doors. The flange may only be added for the purpose of strengthening the door material The flange must not exceed ¾”-inch in length or width and must be mounted in a vertical position. Door flanges must face inward toward the centerline of the chassis. Louvers, bead rolls holes and/or protrusions from top-to-bottom will not be permitted. Holes will be permitted for rub rails/nerf bars. A maximum 1”-inch long lip/flange at a 45-degree outward angle ½”-inch away from the sheet metal for reinforcement will be permitted at the top and bottom of the door(s) panels. All outside sheet metal, door panels, door extensions, air dams, front nose and/or hood fins must be the same shape, size and angle on both sides of the car. The door(s) must match each other from side-to- side (symmetrical). Air directional devices and/or side mounted spoilers of any type, which extend past the outside edge of the flat plane of the body will not be permitted.
b. Bead rolls around the outside perimeter of the door panels and the wing windows will be allowed. Bead rolled edges must face toward the center of the chassis.
c. The top of the door when measured from the ground will be a maximum of 38” and a minimum of 30”- inches when measured 60”-inches from the rear axle centerline. The rear of the door when measured from the ground will be a maximum of 42”-inches to the top of the door when measured 16”-inches from the center of the rear axle centerline of the rear forward.
d. The ground clearance on the bottom of the doors must maintain a maximum of 12”-inches and a minimum of 6”-inches from the ground.
e. A maximum lip and/or flange of 1-1/2”-inches rounded at 90 degrees and facing inward only, on the top and bottom door(s) and rear quarter panel(s) will be permitted.
f. A lip and/or flange angled out at a maximum angle of 45 degrees, extending away from the door at a maximum of ½”-inch and a maximum of 1”-inch in length before it bends inward for strength at the top of the door(s) and/or rear quarter panel(s) will be permitted.

H. Rear Quarter Panels

a. The rear quarter panels must be symmetrical in height, with or without plastic, and no holes.
b. The rear quarter panels must be a maximum of 47”-inches and a minimum of 40”-inches from the ground at the rear and continue in a straight line with the top of the door. (See drawing.).
c. A maximum 2”-inch fender flare may be used, but the overall body width must maintain a maximum of 68”-inches.
d. The rear quarter panels may extend rearward a maximum of 48”-inches when measured along the top plane of the rear quarter panel and a minimum of 44”-inches at the bottom when measured from the center of the rear axle to the rear of the car.
e. A maximum of 16”-inches and a minimum of 8”-inches of ground clearance (when measured from the ground to the bottom of the rear quarter) will be permitted.
f. The plastic / rubber material utilized on the rear of the car may extend a maximum of 16”-inches from the ground to a minimum of 8”-inches from the ground on either side of the car (symmetrical).
g. The panels may have one side plastic on one (1) side only provided the panel remains completely symmetrical.
h. Flanges at a 90 degree angle may be added to the Rear Quarter Panels. The flange may only be added for the purpose of strengthening the Rear Quarter Panel. The flange must not exceed ¾”-inch in length or width and must be mounted in a vertical position. Rear Quarter Panel flanges must face inward toward the centerline of the chassis. Air directional devices and/or side mounted spoilers of any type, which extend past the outside edge of the flat plane of the body will not be permitted.

I. Rear Spoiler

a. No spoiler of any kind
b. Nothing above the rear deck edge, no lips facing forward of the rear deck of any kind.

J. Rear Deck

a. The maximum height of the rear deck when measured from the ground will be 47”-inches and a minimum of 40”-inches.
b. The rear deck lid must be fully enclosed from side-to-side and have a maximum height of 10 ½ ”-inches vertically behind the fuel tank.
c. The left and right rear trunk lids must be symmetrical in size and shape and must remain flat to cover the fuel filler hose and apparatus. The panel must completely cover the fuel cell, the fuel filler hoses and the vent lines.
d. Fuel tank must be completely enclosed from the bottom of this panel (rear deck) to the bottom of the fuel cell. (2020 Rule)
e. Openings from the top of the fuel cell to the bottom of the trunk lid will not be permitted. (2020 Rule)
f. (Optional) The fuel tank sides must be completely enclosed on each side from the front to the rear of the fuel cell and from the bottom of the cell to the rear deck. No holes and/or openings permitted in the side panels. The rear area of the fuel cell from the rear deck to the bottom of the cell must remain open.
g. Nothing above the rear deck edge, no lips facing forward on the rear deck of any kind. Air directional devices of any type, which extend past the rear deck edge will not be permitted.

K. Hood, Nose, and Front Spoiler

a. The maximum width for the hood, nose and front spoiler will be 36”-inches with a minimum width of 24”- inches. Louvers or openings with mesh behind will be permitted on one or both sides of the hood.
b. Only rear facing louvers will be permitted on the top of the hood.
c. The hood, nose and front spoiler must remain the same contour where they meet.
d. The nose-piece must not extend rearward of the front shock towers.
e. The front spoiler must be a separate piece.
f. Shock absorber covers and/or deflectors must not be a part of the nose or the spoiler and/or positively fastened to the nose in any fashion exceeding the 36”-inch maximum width.
g. Fabric material shock absorber covers will be permitted. The covers must not be used to achieve any aerodynamic advantage and/or to deflect air in a positive manner.
h. The maximum the spoiler may extend in front of the front axle centerline will be 20”-inches.
i. The front spoiler must be non-adjustable (hinges and/or sliders will not be permitted). Minimum ground clearance of 4” (inches)
j. The hood shall be considered from the front roll cage to on top and in-line with the front of the radiator.
k. The hood and nose may have a maximum lip and/or flange of 2”-inches on both sides following the contour of the body. They must remain symmetrical.
l. The hood and nose be centered on the centerline of the frame.
m. The hood, nose and/or spoiler must not overlap each other’s location on the frame.
n. Any part of the hood must not exceed 10 degrees and the sheet metal must not have an opening and/or extrusion between the hood and the nose.
o. The hood must extend over the radiator and have complete sides.
p. The front spoiler may have a lip and/or flange a maximum 2”-inches on both sides following the contour of the spoiler not exceeding the maximum width of 36”-inches. The front spoiler may be offset 1”-inch from the centerline of the frame to the right or the left. One 2” high wicker bill may be added horizontally to spoiler in front of shock towers.

L. Hood Scoop

a. There is one type of hood scoop that can be mounted on top of the hood for the purpose of enclosing the carburetor.
b. A minimum of 8”-inches will be required from the highest point on the hood scoop to the lowest point on the front of the front of the roll cage and/or the roof. The hood scoop must be positively fastened to the hood and completely enclose the carburetor and the air filter.
c. The conventional air scoop will have a maximum of 25”-inches in length from the center of the carburetor forward to the end of the hood scoop and a maximum width of 22”-inches will be permitted. Forward facing openings in hood scoop will not be permitted.
d. No add on air deflectors above the top plain of the hood scoop.
e. The only openings on the side of the hood scoop has to be behind the air cleaner, the air cleaner cannot be visible from either the front, above or side views.

M. Interior Sheet Metal

a. All horizontal body support(s) other than the inner pods, whether in the front and/or rear must be a minimum of 1” x 1” .095”-inch thick tubing or 1”-inch flat stock a minimum of .125”-inch thick..
b. Inside and/or outside wings, spoilers, air foils and/or wind deflectors will not be permitted.
c. Double panels and/or sheet metal that is designed to create a wing effect will not be permitted.
d. A maximum 1”-inch reinforced flange will be permitted on all lexan; however, all specified measurements must be retained.
e. All interior sheet metal must completely cover all interior areas, door-to-door, quarter panel-to-quarter panel. Holes and/or openings will not be permitted in this area.
f. Front and rear firewalls are required. The front firewall must isolate the cockpit from the engine compartment. The rear firewall must extend from the top of the fuel cell to the belly pan to isolate the cockpit from the fuel cell. The firewall must be a minimum of .050”-inch thick aluminum and/or magnetic steel. The firewall may be altered and/or cut for drive shaft clearance.
g. Vertical fins, air dams and/or fairings on either side, behind the roll cage will not be permitted.
h. All sheet metal must be a flat single plane across the interior of the car. Two (2) bead rolls or breaks for the purpose of strengthening will be permitted. The maximum bead roll and/or break permitted will be 1/8”-inch in height and ½-“-inch in width.
i. Covered roll bars will not be permitted. Sheet metal that is one-piece and/or part of a body panel formed around tubing that is not considered an aerodynamic advantage will be permitted, provided there is no excess sheet metal.
j. Louvers will be permitted for cooling purposes only, including the radiator, engine and/or working oil cooler. Louvers and/or holes in the interior or exterior sheet metal will not be permitted.
k. The floor and/or belly-pan may not be any wider than the frame at any point. Lips, fins and/or air directional devices on the floor and/or belly pan will not be permitted. Louvers for the purpose of cooling will be permitted on the belly pan from the radiator to the firewall. The under pan must not extend in length past the rear of the seat and exceed the width of the frame rails of the car and must be a maximum of .090”- inches in material thickness.
l. Only aluminum belly pans will be permitted. Panels under the rear and and/or the fuel tank will not be permitted.

N. Driver Compartment

A full metal firewall fabricated from magnetic steel and/or aluminum must encompass the driver’s compartment from front-to-rear, on both sides and floor boards.

Containment Seats

Seats must be “Full Containment” style constructed of aluminum to the general design specifications of current industry standards (SFI 39.2). Design shall include comprehensive head surround, shoulder and torso support system, energy impact foam, and removable head foam. Consult with your seat manufacturer for questions and recommendations regarding your seat safety system.

a. Seats manufactured using carbon fiber or composite materials must meet SFI 39.2 specifications.
b. The seat design should be one from a current manufacturer and/or recommended to include the full containment design. Installation of the full containment seat should follow the manufacturer’s instructions.
c. All cars must be equipped with a quick-release type steering wheel.
d. The driver compartment must have a starting switch and/or button within reach of the driver.
e. A clearly labeled electrical on/off ‘kill’ switch must be within reach of the driver and must shut off motor when in the off position.
f. Mirrors of any-type will not be permitted.
g. Radios and/or electronic and/or data communication devices will not be permitted.
h. Any edge and/or sheet metal end in and around the driver compartment must be protected with trim and/or beading and rounded. Sharp and protruding edges will not be permitted.
i. A substantial rock guard with a minimum of three (3) additional bars must be mounted in front of the driver. The rock guard must be made from wire screen. Windshield screens must be a minimum of .090- inches and must be securely fastened.
j. Fuel and/or power steering lines and/or fittings running through the driver’s compartment must be made from an approved braided type of line. High pressure lines and/or fittings and/or hot fluid lines running through the driver’s compartment must be encased and/or must have a shield.
k. Shoulder guards will be allowed on the right side of the drivers compartment but the entire panel must be built to be a form of a quick release. Front and rear edge to be attached by a Butterfly Dzus fastener on the outside or a quick release button. Recommended front edge should have a quick release type of fabrication built or attached with Velcro. Back edge to be attached by Butterfly Dzus Fastener on the outside or quick release button. The opening from the bottom of the roll cage to top of arm guard is no less than 12 inches from front to back.

O. Numbers and Identification

a. The track and/or series Scoring Director reserves the right to issue and/or change a car number to prevent duplication and/or maintain proper records.
b. Team cars must be clearly identifiable from one another and use another number and/or letter.
c. All number and letter combinations will be limited to three digits. If three digits are used two (2) shall be the primary numbers/letter.
d. Number and/or letter combinations are required on the roof, nose, rear deck and both doors.
e. All numbers and letters must be a minimum of 18”-inches high on the roof and/or doors and 6”-inches high for the rear deck and 8”-inches the nose. All numbers and/or letters must be equal in size and displayed legibly whether decaled and/or painted.
f. The nerf bars must not block the visibility of the number and/or letter combinations.
g. Light bars will be permitted however, they can only be a maximum of eight (8) inches in length and cannot be the colors of yellow, red or green.

P. Bumpers, Side Bars, and Nerf Bars

a. General

i. All bumpers, side bars/nerf bars and/or bracing must be made from minimum 1-1/2 diameter round .095″-inch thick magnetic steel tubing only unless otherwise specified (See below for front bumper specs). All edges and/or corners on bumpers and side bars/nerf bars must be rounded. Sharp edges will not be permitted.
ii. The rear bumper and/or any side bars must not extend past the outside of the tire sidewalls on either the left and/or right side of the car.

b. Front Bumper

i. Only the front bumpers may be made from minimum 1-1/4 diameter round .095–inch thick magnetic steel tubing.
ii. The front bumper must consist of two (2) horizontal rails; an upper and a lower and a minimum of two (2) vertical braces, equally spaced, welded between the two (2) horizontal rails. The horizontal rails must be positively fastened with bolts or pins to the frame with four (4) sockets and/or supports. The front bumper must remain exposed without covering and/or any sheet metal fabrication surrounding it.
iii. The four (4) tubes that support the bumper from the four (4) frame sockets must be horizontal. These rails must be a minimum of 6”-inches and a maximum of 12”-inches apart when measured from the top to the bottom and maintain that measurement for a minimum width of 24”-inches and a maximum width of 30”- inches. The front bumper must also have an 18”-inch center when measured from the ground up to the middle of the bumper. The total width of the front bumper must not exceed 30”.
iv. The maximum the front bumper may extend from the centerline of the front axle is 24”-inches and a minimum of 20”-inches.
v. The front surface of the bumper must remain flat, parallel and perpendicular with the front of the nose piece for the full width of the bumper. V-shaped and/or any other type of shaped bumpers will not be permitted.
vi. The end bracing tube of the front bumper must be fabricated on an angle in such a way as to prevent the bumper of another car becoming interlocked. Please refer to the drawing at the back of this rule book.

c. Rear Bumper

i. The rear bumper must consist of two (2) rails, an upper and lower, which must have a minimum of four
(4) sockets and horizontal support bars positively fastened with bolts or pins attaching it to the frame. The upper and lower rails must also be a minimum of 10”-inches apart and a maximum of 16”-inches apart from the top to the bottom and maintain that measurement for a minimum width of the 64”-inches and a maximum of 86”-inches.
ii. The rear bumper must have an 18”-inch center when measured from the ground to the middle of the bumper.
iii. The maximum the rear bumper may extend back when measured from the centerline of the rear axle is 52”-inches.
iv. The rear surface of the bumper must remain flat and parallel with the back of the rear quarter panel for the full width of the bumper. V-shaped and/or any other type of shaped bumpers will not be permitted.

d. Rub Rails

i. Solid rub rails and inner hoops with ballast added inside or outside will not be permitted.
ii. The rub rails must be exposed and outside the body panels. The left side rub rail may extend a maximum of 2”-inches outside the left rear tire sidewall.
iii. The rub rails must be bent with a gentle radius at a 90-degree angle and must protrude a minimum of 6”- inches back in past the body.
iv. The rub rails must be a minimum of 50”-inches long from socket-to-socket
v. All three attaching points must be fastened with bolts or pins.

e. Bumpers and Rub Rails

i. Only a minimum of 5/16” bolts with nyloc nuts and/or DIRTcar approved quick release solid pins will be permitted for positively fastening bumpers and rub rails to the car. Cotter pins and/or other fastening devices will not be permitted. Double rub rails will be allowed on Modifieds, 358 and Sportsman on left side only. Single rub rails only allowed on right side.
ii. All bumpers and rub rail sockets must have fasteners, pins and/or bolts with a minimum diameter of 5/16”- inch.
iii. The front and rear rub rails must have a 360 degree sleeve a minimum of 3/8”-inch wide x .095” thick magnetic steel welded to the rub rail tube butted against the support socket to prevent pins from shearing. Refer to the drawing at the back of this rule book.

Section 8 – Suspension

A. General

a. Suspension designs and applications are constantly evolving. Although the intent of the suspension rules are an attempt to accommodate the majority of suspension and suspension component designs and applications currently being used in competition, the rules cannot be absolute. Any and all new designs or modifications to an existing suspension and/or suspension component must be communicated to and approved by the DIRTcar Racing before being used in competition.

B. Front End

a. The front axle must be a straight, one-piece axle manufactured from magnetic steel tubing. Only approved camber adjustments and/or camber adjustment devices will be permitted. Any other camber adjustments and/or will not be permitted.
b. Split axles and/or dropped axles and/or independent front suspension(s) will not be permitted.
c. All brackets on the front axle must be welded and/or bolted. Bird cages and/or sliders will not be permitted.
d. Only approved Modified front spindles will be permitted.
e. Bearing shafts that are made of steel are recommended.
f. The chassis may be offset a maximum of 4”-inches from the center of the inside tire width measured from the inside of the left front tire to the inside of the right front tire at axle height. Refer to the drawing in the back of this rule book regarding front and rear end offset details.
g. The front wheels and tires must remain fully exposed. Fenders and/or air deflection devices of any type will not be permitted.

C. Shock Absorbers

a. Only DIRTcar approved A-B-C type shock absorbers will be permitted to compete.

i. The total visible shock shaft length must match OEM manufacturer specifications.
ii. Base valves cannot be added or permitted to our approved shocks.

b. Shock absorber claim is $275 ($340 canadian) per shock, no exchanges.  See bulletin for claiming parameters.
c. Approved Shock Absorbers: All shock absorbers for the DIRTcar Sportsman Modifieds, DIRTcar Pro Stock, DIRTcar Pro Late Model, DIRTcar UMP Sportsman and DIRTcar UMP Stock Car division must be approved. There will be three types of approved designations, ‘A’, ‘B’ and ‘C’.

i. Approved “A” type Shock Absorbers:

1. DIRTcar NE Sportsman Modified – Pro Shocks – WB and SS Series / Bilstein – AK and SG/SM Series
2. DIRTcar Pro Stock – AFCO 1020-1034 Series
3. DIRTcar Pro Late Model – AFCO 1273-1295 Series
4. DIRTcar UMP Sportsman – AFCO 1473-1497 Series
5. DIRTcar UMP Stock Car – Integra 421 Series

ii. Approved “B” type Shock Absorbers:

1. DIRTcar NE Sportsman Modified – Pro Shocks – TA Series / Bilstein – SL/SZ Series
2. DIRTcar Pro Stock – AFCO 19, 24, and 74 Series / FOX- 983-97-507 / FOX 983-97-509
3. DIRTcar Pro Late Model – Bilstein – SLS Series

iii. Approved “C” type Shock Absorbers:

1. DIRTcar NE Sportsman Modified – Bilstein – SL/SZ Series / Bilstein – SNS Series
2. DIRTcar Pro Late Model – Bilstein – AFCO 1300 Series / AFCO 2100 Series / Genesis – GD Series (Steel Body) / FOX 983-91-507 / FOX 983-91-509 / DIG 7507/7509 (Steel Body) / Penske 7100

d. Shock absorbers must be submitted to World Racing Group for competition approval prior to the application of the shock absorber designation decal.

D. Suspension Components

a. General

i. Independent front and/or rear suspensions will not be permitted. No Cantilever suspensions allowed.
ii. A-Frames and/or ball joints will not be permitted for steering axis (kingpin only).
iii. Four-wheel steering actuated by the steering wheel and/or of any type will not be permitted.
iv. All suspension systems (including travel limiters) and designs must be mechanical. Hydraulic, pneumatic (air), electronic, radio and/or computer assisted for adjustments, and/or in-or-out of cockpit type suspensions, and/or suspension adjustment systems will not be permitted. Only one travel limiter permitted per car.
v. Traction control of any type, including within the braking system is not permitted.
vi. Only a single brake bias and shut off will be permitted in the cockpit. Rear panhard bar adjustment devices will not be permitted in the driver compartment. Any rear panhard adjustments that have a knob and/or an adjustment device outside of the cockpit must be wired in a fixed position for competition.
vii. Only double-sided (two) torque arms will be permitted and must be mounted in a fixed perpendicular position to the rear end. Front slider rods and the torque arms attaching point must be centered in chassis (left to right). Both sides of the torque arm assembly (right and left) must be symmetrical in size and shape. Both sides of the torque arm assembly (right and left) must be attached to the center pick up point.
viii. Spring rods allowed on right rear radius rod only. Must be a conventional approved spring rod. No externally mounted shocks attached to radius rod. No Rubber biscuits allowed on the left rear radius rod.
ix. Only conventional type aluminum birdcages. All Bird cages must be clamped or fixed to rear end tubes and cannot move. Maximum bracket thickness 2” (inches). Any new birdcage designs must be approved.
x. The only materials used to fabricate axle housing mounts (birdcages) that will be permitted is aluminum unless authorized by DIRTcar. Axle housing mounts fabricated of exotic, heavy materials will not be permitted.
xi. When fabricating axle housing mounts detail must be paid to functionality. The completed axle housing mounts, when comparing the right and the left side, must be as similar in design as possible.

b. Rear Suspension Attaching (Radius) Rods

i. Only one radius rod per side will be permitted to locate rear end to chassis. (No Four link style suspension will be permitted).
ii. Radius rod must be mounted in a fixed position front and rear.
iii. The only materials used to fabricate attaching (radius) rods that will be permitted are magnetic steel or aluminum
iv. Aluminum attaching (radius) rods must be tubular material only. Magnetic steel attaching (radius rods) must be tubular with a maximum wall thickness of 3/16 inch.

c. Springs

i. Any type and/or form of spring will be permitted (torsion bar or coil spring). One per corner, no helper springs will be permitted
ii. Stacked coils and of any type are not allowed in the sportsman division. No progressive springs allowed. A maximum of one 2 ¼ inch high foam type rubber (no neoprene) will be allowed to stop bottoming of shock.
iii. Only one take up spring allowed per corner. Maximum rate 5lbs.
iv. Coil springs must be manufactured from magnetic steel.
v. Spring preload adjustments for coil springs must be made using mechanical adjusting nuts on the shock body. No coil spring pre-loader assemblies permitted.
vi. One spring rubber per corner is allowed.

d. Brakes

i. All cars must have four (4) wheel hydraulic brakes in good working condition. Random brake inspection may take place throughout the season.
ii. Carbon fiber, carbon, titanium, ceramic, aluminum pads and/or rotors will not be permitted.
iii. No floating mounted brake calipers.
iv. Brake bias may be adjustable through the cockpit.
v. Manual brake shut offs will be permitted. An electronic brake shut off switch will also be allowed on the right front only.
vi. Rear brake calipers must be approved aluminum 4 piston designs and must be operational. Maximum rotor diameter 12.19” diameter by 1.25” thick and must be vented. No solid rotors with the exception of the 3/8” rotor.

e. Wheelbase and Tread Width

i. The minimum wheelbase is 106”-inches and a maximum of 110”-inches with a maximum tolerance of ½”, when measured from the centerline of the rear axle to the centerline of the front axle for both left and right sides.
ii. The maximum front tread width will be 86”-inches with a minimum of 74”-inches. The maximum rear tread width will be 86”-inches with a minimum of 80”-inches. These measurements will be taken from the outside edge of the sidewall of the tires on each side with a maximum tolerance of ½”

Section 9 – Rear End Droop

A. All cars must have underslung 1 ½” (inch) bars under the rear-end with a maximum of a ½” drop below the bottom of the 2 X 4 frame rail. (Please refer to drawing in 19.16).

Section 10 – Roll Cage

A. Only round magnetic steel tubing 1-1/2” and/or 1-3/4” in outside diameter with a material thickness of 1- 3/4”-.095”-inches and/or 1-1/2”-.120”-inches will be permitted.
B. The roll cage must be an integral and structural part of the frame. All frames built in 2005 and after must have a manufacturer’s unique serial number plate visible and positively fastened on the left front roll cage upright. The letters and/or numbers shall not exceed 8 digits and be ½”-inch in height. See drawing 4.7.2
C. Front and rear roll bars must be positively fastened in a cage-type configuration. Two (2) round horizontal side bars on each side are required. The top side bar must be a maximum of 22”-inches below the top roll bar.
D. Proper bracing and triangulation on the front and rear roll bars is required. All roll bar bracing material must be 1-1/2”-inches outside diameter with a material wall thickness of .095”-inches. A minimum of one
(1) 1” diagonal bar across the top of the roll cage is required.
E. The rear main roll bar hoop must be a minimum of 26”-inches when measured across the outside-to- outside of the hoop and maintain that measurement from the top to the bottom of the cage. The bottom of the rear main roll bar hoop must be positively fastened (welded) to the 2”x4” frame rails. Outriggers will not be permitted.
F. The front roll bar hoop must be a minimum of 26”-inches when measured across the outside-to-outside of the hoop and maintain that measurement from the top to the bottom of the cage, with the exception of the allowable frame taper. Outriggers will not be permitted. Refer to the drawing in the back of this rule book.
G. MANDATORY Frame/Roll Cage update: A piece of tubing, a minimum of 1-1/4” in outside diameter and .095”-inches in thickness, must be installed vertically and must extend through the car into the bottom frame rail or extend back to the union at the top of the door and rear main hoop joint. The tubing must be installed in a manner that does not impede the driver exiting the cockpit. The tubing must be mounted a minimum of 9” inches and a maximum of 12”-inches on the roof bar from the existing rear roll cage hoop. This must be installed symmetrically on both sides of the roll cage. Existing cars must be retrofitted with this piece of tubing.

Section 11 – Wheels

A. Aluminum or steel wheels will be permitted for competition. Magnesium, steel, carbon fiber and/or any other exotic type material will not be permitted.
B. ‘Bleed-off’ and/or ‘Bleeder’ valves will not be permitted.
C. The maximum rim width will be 14”-inches when measured from the inside of left bead to the inside of the right bead of the wheel. Only wheels 15”-inches in diameter will be permitted.
D. Beadlocks will be permitted. Any wheel utilizing a beadlock must maintain a minimum diameter hole of 11” or 5” inches inside the beadlock and the wheel. Beadlocks may only be used on the outside of the wheel.
E. Wheel spacers must be aluminum.
F. Maximum wheel weight 28 lbs. Weights of any kind, added to wheels other than conventional balancing, are not permitted.
G. Wheel covers: it is highly recommended that wheel covers have a minimum of 5 mounting points. However, both 5 and 3 mounting point wheel covers will be allowed for competition under the following conditions: Wheel covers having a minimum of 5 attachment points may continue to use steel dzus fasteners. Said dzus fasteners must be made of steel only. No Adjustable expansion mounting rings allowed.
H. No Plastic Wheel Covers
I. Wheel covers having only 3 attachment points must be bolted-on at all 3 points utilizing a minimum 5/16”, flanged steel bolt and an approved fastening (nut assembly) system.
J. Approved fastening (nut assembly) systems:

a. Keyser Manufacturing: Part #100 7-101.
b. Wehrs Manufacturing: Part # WM377A-312 (Aluminum 5/16) / WM377S-312 (Steel 5/16)
c. Triple X Chassis: Part # SC-WH-7810 (for a 1” spring) / SC-WH-7820 (for a 1 3/8” spring)
d. Smith Precision Products: Part # MC-516-18

K. Optional fastening systems that are equal or superior to the above-approved system will be readily approved at the sole discretion of Technical Officials.
L. Foam inserts may be permitted.
M. A minimum of five (5) lug nuts on the rear wheels will be required. A minimum of three (3) lug nuts will be required on the front wheels. Knock off hubs of any type on any wheel will not be permitted.

Section 12 – Tires

A. Only Hoosier Racing Tires will be permitted in any DIRTcar sanctioned events. Hoosier (the tire manufacturer) will mark/stamp/brand all legal tires with specified compound and/or other specific DIRTcar designations as listed below:

a. Big Block, 358 Modifieds, and Sportsman:

i. D300
ii. D400
iii. D500

b. Tire Size and Compound Designation:

i. Left Front – 11/82-15
ii. Right Front – 13/82-15
iii. Left Rear – 13/87-15
iv. Left Rear – 13/89-15
v. Right Rear – 13/92-15

B. The altering of any tire compound, by any means will not be permitted. Chemical alteration of the tread carcass and/or tread compound, such as tire ‘soaking’ and or the introduction of tread ‘softener’ and/or the physical defacement (removal, altering and/or covering) of tire sidewall markings in any manner will not be permitted. If any competitor is found to have altered their tires any penalty deemed appropriate by Super DIRTcar Series and/or DIRTcar Officials may be issued. Tires may be protested by another competitor following the protest rules as stated in section 11.2.

a. Any tire may be inspected and/or analyzed for alteration at any time. This will consist of a process as determined by the independent laboratory that performs the analysis. A “Chain of Custody” process will be outlined with the competitor upon inspection of the tires.
b. The analysis process will require shipment of the tire to the selected laboratory. Additional race event(s) may be completed before a determination is made. If a penalty is issued, the event(s) that fell into the analysis time period while the tire(s) were being analyzed may be considered as part of the penalty time period.
c. Reference Section 5.3.D. for Competitive Analysis, Section 11.1.S & T for Penalties and/or Section 11.2.I for Protest(s).

C. Removable duct tape, provided it does not deface the tire, to cover the D-Number will be permitted.
D. Heating of the tires by torch, blanket, heating device(s), exhaust system and/or any other method will not be permitted.
E. Inner liners or sidewall stiffeners of any type will not be permitted.
F. A tire durometer may be used during the tire inspection process, provided baseline tire(s) have been read at the event prior to inspection.

Section 13 – Personal Safety Equipment

A. General

a. Each competitor is the solely responsible for the effectiveness and proper installation, per the manufacturer’s specifications, of personal safety equipment and determining it to be adequate for competition at every event. Each competitor is expected to investigate and educate themselves for continuing improvement regarding their own personal safety equipment.
b. Different safety regulations may be in place depending on the local and/or state government rules and/or laws and/or regulations in the specific location of the racetrack. Helmet and seat belt dates and/or specified equipment requirements, worn, utilized and/or otherwise may be different than specified in the rule book. Contact your local track officials for more information regarding this.
c. Each division section (17 to 20) will cover the General and Specific Safety and Personal Protection minimum requirements. All participants are solely responsible to meet the requirements in the specific division.

B. Seat Belt and Restraint System

a. Each car must be equipped with minimum of an SFI 16.5 or SFI 16.1 approved restraint system. Restraint system will be eligible for use in competition until the expiration date or for 2 years from date of manufacturer. Seat belt restraint systems shall be installed and used in accordance with manufacturer’s instructions.
b. In any type of manufacturer’s installation, the fasteners must be as supplied by the manufacturer.
c. Seat belt material should not be permitted to come in contact with any sharp or metal edge, including when the material passes through the seat.

C. Protective Cothing

a. All drivers will be required to wear a fire-resistant driving uniform meeting minimum of the SFI 3.2A/5 specification and display a valid SFI 3.2A/5 label on the outside of the uniform.
b. Drivers must wear gloves at all times they are on track. Driver’s gloves must meet or exceed the SFI 3.3 specification and have a legible and valid SFI 3.3 label.
c. Drivers must wear shoes that meet minimum of the SFI 3.3 specifications and display a valid SFI 3.3 label.

D. Seats

a. All current seats must be full containment type constructed of aluminum or approved carbon fiber and must adhere to the general design specifications of SFI 39.2 seat construction standards. Design shall include comprehensive head surround, shoulder and torso support system, energy impact foam, and removable head foam.
b. Carbon fiber seats must have a current valid SFI 39.2 certification.
c. SFI 39.2 seat compliance is recommended for World of Outlaws Late Models, Super DIRTcar Series, DIRTcar 358 Modifieds, DIRTcar Late Models & Pro Late Models, DIRTcar Sportsman, UMP Modifieds and Pro Modifieds, DIRTcar Pro Stocks.
d. Seats must be used as supplied and installed following instructions provided by the seat manufacturer
e. If the left side head surround is 7 inches or less when measured from the back of the headrest, then a left side head net meeting the SFI 37.1 must be installed with a quick release latch. A minimum left side head surround of 4 inches is required.

E. Helmets

a. All drivers must wear a full-face helmet with a minimum safety rating of FIA 8860-2018, Snell SA 2020, Snell EA 2016, Snell SA 2015.

F. Head and Neck Restraints

a. Drivers, at all times they are on the track, must have their helmets correctly (following manufacturers installation and use instructions) connected to an approved head and neck restraint.
b. The head and neck restraint must be SFI 38.1 approved and display a legible and valid SFI 38.1 label.

G. Fire Suppression

a. All racecars shall be equipped with a thermally deployed automatic fire suppression system. The fire suppression system will consist of a DOT approved cylinder manufactured from aluminum or steel with a capacity of ten (10) lbs. of fire extinguishing agent, steel or steel reinforced lines, and has a minimum of two (2) thermally activated discharge nozzles.
b. All systems must meet or exceed SFI 17.1 specifications. SFI Label must not be expired and easily accessible for tech officials to read.
c. Systems must be fully charged with ten (10) lbs. of DuPont FE-36, 3M NOVEC 1230, FireAde or 4Fire and display a legible and valid SFI and manufacturer label depicting fire extinguishing agent, capacity, and certification date. Cylinders that are beyond useful certification date must be inspected, serviced and re-labeled by the manufacturer.
d. Cylinders must be mounted forward of the fuel cell. Cylinders must be securely mounted to the frame/roll cage assembly. The certification label must be unobstructed and easily accessible for inspection when the mounting is complete. For systems with one activation point, the activation point may be mounted in the cockpit or rear of the car close to the fuel cell.
e. The cylinder must be connected to the nozzles with steel or steel reinforced lines.
f. Two (2) thermally activated nozzles must be used. One (1) nozzle must be located directly above the fuel cell in the fuel cell area and the second nozzle located in the driver cockpit area.
g. An optional manual override cable is recommended for two (2) thermal automatic nozzle systems but is mandatory for systems with one (1) activation point.
h. Fire Suppression bottles must remain on during all racing events. If a bottle is found to be turned off during an event, a fine of $100 will be put in place. A second offense to the same driver will result in a
$300 fine. Third offense will result in disqualification, loss of points and money along with probation. (all sections)
i. If a Fire Suppression Bottle is found to have been tampered with at discretion of DIRTcar officials it will be a $500 fine.
j. Cylinders must be mounted forward of the fuel cell just above the deck or below the deck.
k. Cylinders must be securely mounted to the frame/roll cage assembly and centered in the chassis horizontally.

H. Other

a. Only SFI 45.1 roll bar padding may be used. Knee, steering pads and/or additional padding may be utilized.
b. All teams should have an easily accessible fire extinguisher or its equivalent in the team’s pit area.

Section 14 – Other

A. Cars will not be permitted to make a qualifying attempt without passing technical inspection. All cars must be available for inspection prior to the time of the driver’s meeting. All cars must come to inspection race ready, if not, car will not be inspected and asked to return to the pit area to make proper changes. Following the driver’s meeting, covers of any-type on the racecar will not be permitted.
B. All fuel lines, power steering lines and/or fittings running through the driver’s compartment must be made from a braided or other approved type line. Plastic and/or glass fuel filters will not be permitted.
C. All cars may be subject to technical inspection at any time.
D. Full or partial car covers will be permitted only when there is inclement weather, and/or the car is in its designated pit stall. All covers shall be removed prior to the car leaving its designated pit stall.
E. Roll bar padding mandatory on all roll bars that helmet may come in contact with. Knee and steering pads and/or padding is recommended.
F. All teams must have a fire extinguisher in the rear of their transporter with the car number clearly visible on the extinguisher. The fire extinguisher must be a minimum of 20lbs and is recommended to FFF type chemical and/or DuPont FE-36 and/or equivalent.
G. Fire Suppression Systems Cylinders are mandatory and must be mounted forward of the fuel cell, behind the seat below the deck or just above the deck (Pro Stocks should be below deck or mounted inside the cockpit, right-side of driveshaft and must be easily visible). Cylinders must be securely mounted to the frame/roll cage assembly and centered in the chassis. SFI certification along with manufacturers date must be clearly visible.
H. All drivers are required to have a one-way radio. The one-way radio must be working and active prior to any ‘on-track’ activity. Two-way radios, crew-member to driver and/or any other means of electronic communication, other than the one-way radio will not be permitted. ONEWAY RADIO MUST NOT BE ABLE TO SWITCH BETWEEN TWO OR MORE PROGRAMMABLE CHANNELS.
I. Seven (7) days prior to any scheduled and/or sanctioned one (1) day DIRTcar Northeast Series event paying less than $20,000-to-win race teams will not be permitted to rent, test and or attend any practice session(s) at the scheduled track, unless approved by DIRTcar. Any race team and/or driver in violation will be given one (1) lap of qualifying and the best their qualifying position that will be earned is 50% + 1 of the entered cars for that event.

Section 15 – Series Decal and Patches

A. All participants will be required to display decals as provided on the decal verification sheet prior to entering into competition. If any required decal is not displayed loss of any awarded money will be the penalty.
B. A series decal is required on both sides of the car. Driver must display the series patch on their uniform to receive point fund awards.

Contingency and sponsorship awards; any team participating must meet the requirements of the award(s) such as decals, patches, product use and verification. There will be a written deadline presented to the teams prior to the start of each season for each element to be in place for the award requirements. If it is an existing program it will roll over from the prior season and the program will begin at the first race of the season.

Section 16 – Drawings

A. Mandatory Decal Placement:

B. Body Dimensions

C. Chassis Diagram

D. Rear End Droop

E. Transponder Mounting Location

F. Front Bumper

G. Roof Angle (Maximum 10 Degrees)

H. Fuel Cell

   

LIMITED SPORTSMAN

BODY/FRAME/DRIVETRAIN SPECIFICATIONS :

Chassis Must be 3 years or older

Reference to OPEN MOD for frame and body specs. In exception of sail panels and Items listed below.  (See Below)

MOTOR RULES

OPEN SPORTSMAN ENGINE or un-altered GM sealed 602

Crate 602 engine P/N #88958602 will be allowed, Following DIRTCAR 602 division engine rules.

602 Engine option will be subject to follow all DIRT Car Sportsman Rules. (Engine, Carburetor, exhaust etc..)

 

OPEN SPORTSMAN STYLE ENGINE

ENGINE SPECS

This class is reserved for North American passenger car V-8 engines with stock OEM cast iron block and heads.

  1. Normally aspirated engines only.
  2. All engine parts must have casting or part numbers on them for identification.

– Engine maximum overbore cubic inches (C.I.).

– GM Crate – 4.00″ bore x 3.480″ stroke 350.

– Chevy 350 – 4.00″ bore x 3.480″ stroke + .070″ 363 C.I.

– Ford 347 – 4.00” bore x 3.400 stroke + .060” 352 C.I.

– Ford 351 – 4.00″ bore x 3.500″ stroke + .060″ 363 C.I.

– Chrysler 360 – 4.00″ bore x 3.578″ stroke + .020″ 364 C.I.

– Chrysler 340 – 4.04″ bore x 3.313″ stroke + .060″ 350 C.I.

(factory casting # must remain visible)

 

CYLINDER HEADS

  1. Stock cast iron OEM American passenger car cylinder heads.
  2. Chevy bow-tie, Dart 180 or 200, Chrysler W-2 and Ford competition heads are permitted. All identification numbers must be visible and unaltered.
  3. Factory valve spacing and angles must remain unaltered.
  4. NO aluminum heads.

(factory casting # must remain visible)

 

RODS

  1. OEM stock production or aftermarket solid steel rods only.

 

CRANKSHAFT

  1. Any steel or cast-iron crankshaft is permitted providing it maintains stock stroke for engine being used.
  2. Aftermarket OEM replacement crankshafts with holes drilled through crankpins are permitted providing they maintain stock specifications and appearance.
  3. NO lightweight crankshafts permitted. 45lb minimum weight.
  4. The minimum rod and main journal sizes must be manufacture specifications less factory undersize. Stock mains 2″ rod journals.

 

PISTONS

  1. Any brand three ring flat top aluminum pistons.

 

CAMSHAFT

  1. Any make hydraulic or flat tappet camshaft is allowed.
  2. No roller cams.
  3. Shaft rockers are NOT allowed.
  4. Engines with stock OEM shaft rockers are allowed.
  5. Roller rockers with optional radios are allowed.
  6. Lifters must maintain stock OEM diameters.
  7. Lifter bores must remain in stock OEM positions and angles, but may be rebushed for wear.
  8. A flat steel lifter galley plate may be used to prevent engine damage in case of push rod failure.

 

INTAKE MANIFOLD

  1. OEM stock cast iron 2-barrel intake manifold permitted.
  2. Optional aluminum 4-barrel spec manifold may be used:

 

Chevy 350 – Brodix # HV1011 Ford 350 – Edelbrock # 2981 – 2980 Ford 347 2921

Chrysler 340 – Edelbrock # 2915 Chrysler w/W-2 heads # 2920

 

CARBURETOR

  1. Any American stock OEM 2-barrel carburetor with up to 1-11/16″ throttle bore with no adapter plate is acceptable on 2-barrel cast iron manifold.
  2. Holley carburetor # 4412 may also be used. Spacer adapter of no more then 1-1/16″ including gasket.
  3. Modifications that will be permitted, any other modification will NOT be permitted:

– Holes drilled in the throttle plates for proper idling.

– Drilling, tapping and plugging of unused vacuum ports.

– Welding or throttle shaft to linkage arm.

– Drilling of idle or high-speed air correction jets.

– Milling of center carburetor body metering block surface, a max. of .015″ on each side.

– Removal of choke plate and shaft.

– Jets may be changed as needed.

 

IGNITION

  1. Distributor must be stock OEM or stock type aftermarket.
  2. Stock OEM or stock type aftermarket coil and module.
  3. No trigger ignition.
  4. On H.E.I. ignition systems coils must remain in the stock location and system must remain as manufactured.
  5. Must maintain OEM firing order.
  6. Only one (1) coil allowed on car.
  7. Only one (1) 12-volt battery permitted.
  8. No step-up transformer or any other device that increases voltage allowed.
  9. No traction control devices or form of braking devices that controls traction allowed.

 

LUBRICATION SYSTEM

  1. No dry sump systems allowed.
  2. Steel oil pans only.
  3. The oil pan must have a 1″ inspection hole on the left side for checking connecting rods.
  4. No external oil pumps or Accu-sumps allowed.
  5. No form of engine evacuation system by internal or external driven pumps or by connection between exhaust system and valve covers, intake manifold or oil pan allowed.
  6. Oil coolers are permitted providing they are mounted under the hood or under the left-wing panel.

 

WATER PUMP

  1. Water pump must be cast iron or aluminum.
  2. Radiator fan must be steel.
  3. No electric cooling fans or pumps allowed.

 

FUEL PUMP

  1. Must remain in stock location for make engine.
  2. Must be driven as stock OEM equipment.
  3. No electric fuel pumps allowed.

 

FUEL

  1. Gasoline Only. (Oxygenated Fuel or any type of exotic fuel or additive will not be allowed)
  2. No nitrous or any other fuel additives.
  3. All fuel subject to random testing.

 

REAR WING WINDOWS (DIRT STYLE BODIES)

  1. All rear wing panels and windows must resemble a current OEM body style. Their upper profile may not protrude above a straight line drawn from the rear of the roof to a point 3’’ higher than the rear deck. There must be at least a 2” indent in the profile, so as not to make this panel a fast back.
  2. The maximum base length may not exceed 61’’. Left and right must be of the same style and dimension.
  3. All window styles must be nominally 160 square inches (suggested 10” tall x 16” long), clear, smooth Lexan with no bends or breaks.
  4. No writing or decals permitted on the wing windows.
  5. Rear view of the wing window must go in a straight line from top of quarter panel or body line to the roof, with a maximum gradual bow of 2” in the center of wing window.

 

REAR END / DRIVETRAIN

  1. Left or Right rear pan hard mounts are permitted, internally adjustable pan hard mounts are not permitted
  2. Only 10” Ring and pinon allowed
  3. Steel Drive shafts and yokes only, no part of driveshaft can be made of aluminum or titanium.

 

SHOCKS

  1. Steel body shocks only
  2. Only one shock per wheel, shock absorbing spring rods are not permitted

 

REAR SUSPENSION

1. Coil over rear suspension will NOT be permitted in the limited sportsman division, Torsion Bar only, any rate torsion bar allowed

 

BALLAST WEIGHT

  1. No ballast weight of any kind should be attached to axel tubes or rear ends. No exceptions.

 

4CYL STOCK

SCDRA RULES

General:
– Must be a commercially produced FWD 4-cylinder car from a known auto manufacturer
– No turbo charged, super charged or rotary engines allowed
– No all-wheel drive cars or all wheel steer cars
– Engine must be outwardly stock appearing. There is no engine teardown in any way.
– Engine must match brand of car (ex. Honda must have Honda engine). Engine swaps are allowed.
– SCDRA has final ruling on all questions of legality. A pre-race inspection will be made to ensure SAFETY only.
– Questions of legality can and will be answered during the pre-race inspection if asked by entrant. No guarantee of legality shall be expressed or implied during pre-race
inspection. Legality will be determined in POST-race inspection.
– Competitors must present cars for inspection prior to participating in any racing event.
– Mirrors are allowed
– RaceCeiver / RE Switch or a like device is mandatory at all times on track.
– No two-way radios of any kind allowed

Weight:
– All cars must weigh a minimum of 2,200 pounds with car and driver after the race Exceptions: 50 lb. weight break for HANS or like device
50 lb. weight break for full containment seat

Suspension:
– Must have stock rear and front suspensions as from factory. Any transplanted OEM suspension or steering parts must be brand for brand and must bolt into factory mounting
holes without alteration to operate. Slotting of factory mounting holes allowed. No adjustable aftermarket suspension components. Any adjustable OEM components must be welded to
render them non-adjustable Plating and structuring for durability and safety is allowed.
– No racing springs/shocks/struts allowed. Springs may be heated, clamped or use spring rubbers. Springs may be swapped from other models but within 2” of factory installed height.
– There will be a strut assembly (to include spring and bumps or devices) claim of $200 each.
– Rear control arms should be stock but may be braced / strengthened / repaired. No adjustable control arms.
– Stock type aftermarket suspension bushings are allowed
– Stock type STANDARD, non-adjustable, non-rebuildable shocks / struts required
– No weight jacks / cups of any kind
– Suspension limiter chain or tether is allowed as a solid piece. No aftermarket limiters.
– Bump stops are allowed on struts.

Body / Roll Cage:
– Must have a fully-welded, quality built MINIMUM 4-point roll cage inside the car with minimum of 0.95″ thick tubing – SCDRA Tech Official has final say in safety of the cage
– Minimum 3 driver door bars / 2 side door bars – 6 or more-point cages okay
– Minimum of 3 vertical windshield or “trash” bars in front of driver.
– No part of the driver’s helmet may extend above the lower level of the roll cage halo.
– Roll cage may extend forward behind bumpers. Bumpers must be covered in some way with no exposed sharp corners. Coverage is at officials’ discretion.
– Frame-like tubing only allowed for REPAIRS in front of front strut towers and behind rear strut towers. No other frame-like tubing may be added to chassis.
– Aftermarket asphalt style nose pieces allowed. Any nose piece used must be conformed to fit at reasonable and near-factory dimensions.
– No push bars to extend outside of bumpers or beyond nose piece.
– All bumpers (stock or tubing) must be covered and no sharp edges may be exposed
– No rub rails allowed on sides of body
– Sunroofs must be closed / covered with sheet metal
– No holes are allowed in the hood or front fenders and hood should cover entire engine compartment.
– Holes in firewall and floor should be covered in order to seal off driver from hot fluids or parts.
– Floor pans and/or firewalls should remain intact between the front strut towers and rear strut towers. Firewalls and floor pans may be patched with STEEL for REPAIRS only.
– Gutting of body is allowed however car should maintain reasonable appearance of stock car.
– Driver and front passenger door window openings along with rear and front window openings must remain open and uncovered. Front windshield visors no more than 12” are allowed. Rear
door and/or small rear side windows can be closed or covered.
– No fins, wings, gurney flaps or lips are allowed anywhere on body. Properly constructed and mounted rear mount spoilers that run from side to side are allowed within reason.
– Sheet metal decking should remain flush with doors and stock body lines and should not create any lips or airfoils. There must be 2 inspection doors on decking. 1 at front and 1 at the
back.
– Sheet metal roofs CANNOT be flat and should be made to closely resemble the factory roof lines. Roof pillars must also closely resemble the factory shape and lines.
– Some sheet metal will be allowed. The spirit of this rule is to keep cars remaining as close to stock appearing as possible. No more than 1/3 of the original body can be sheet metal – this
does not include decking and/or interior. See diagram below. You can mix and match to achieve this 1/3. Additional sheet metal not as specified may result in a 100 lbs. weight penalty which
increases by 100 lbs. at each event until corrected.

Tires / Wheels / Brakes:
– Aftermarket racing wheels allowed – 7 inch maximum. NO BEAD LOCKS – maintain proper air pressures.
– Street legal DOT tires required. No competition tires, drag radials, mud grip lug tires, racing tires or racing recapped tires allowed. Directional tires are allowed.
– Tire inner tubes are allowed
– Tires can be mixed and matched for stagger on all 4 corners
– Stock-type master cylinders required. No bias adjusters or shut-off valves.
– Brakes must remain stock-type and operational 4-wheel brakes. Aftermarket pads and rotors are allowed.

Ignition / Fuel / Exhaust:
– Any air or oil filters (K&N, etc.). Air intake filters must be closed on the end.
– Intake must be a stock intake. Porting and polishing are allowed. No Skunk 2, etc.
– Any racing fuel or pump gas allowed
– No Nitrous oxide or nitro methane allowed
– Stock-type fuel injection or stock manufactured carburetor only (Motorcraft, etc…). ONE 0.800″ maximum throttle body spacer may be used. Stock-type aftermarket and OEM throttle
bodies are allowed. No Holley, Weber or other racing carburetors allowed. Carbureted cars must be stock for engine.
– No cold air intakes for fuel injections – must be stock type breather system. A flexible rubber or plastic hose may be used in place of the stock air box tube. No smooth metal or
smooth plastic tubing allowed. A cone type filter is allowed and may be connected directly to throttle body or the allowed tubes.
– Aftermarket radiators allowed – can be braced for support
– Aftermarket (racing) header is allowed and will be subject to claim. Claim is $300 and includes only the header itself. Claims must be made with the lead tech inspector and must be approved
by SCDRA.
– Computer may be chipped and/or tuned. A standalone ECU and aftermarket harness are allowed. Ignition coils must remain OEM however the coil-on-plug kits are allowed.
– Racing fuel cells are highly recommended. An approved racing fuel cell must be commercially produced with a plastic or rubber bladder as well as an outer metal enclosure. Cell should be mounted properly as per manufacturers recommendations and it should have a rollover valve or ball.
– The fuel rail may be aftermarket in the interest of safety. No exotic or high-capacity rails subject to the discretion of the lead SCDRA tech inspector. A fuel pressure regulator and/or
gauge are allowed.
– Exhaust which runs through the cockpit should be fully shielded from driver with metal
– Exhaust pipes must not extend out of any body surface more than 1” and pipe must be blunt and free of sharp edges.

Safety:
– RACING helmet with Snell SA 2010 or FIA 8860-2010 certification or newer is required (no motorcycle or DOTs helmets)
– Minimum single-layer fire suit required (SA 3.2A specification recommended).
– Racing shoes (SFI Spec 3.3) are REQUIRED to be worn during competition or on the racing surface.
– Fire proof gloves are mandatory (SFI 3.3 specification recommended).
– A 4 or 5-point harness, properly mounted per manufacturers’ specifications, is required. Harness certifications are good for 4 years from date of SFI certification or until marked
expiration. Any worn, abraded or torn belts shall be replaced. Harnesses should be mounted to roll cage at all attachment points.
– A minimum 5 lb. fire extinguisher or on-board fire suppression system is strongly recommended and should be securely mounted within drivers reach.
– Only commercially produced racing-type seats which are properly mounted per manufacturers’ specifications are allowed. A full containment seat is strongly recommended. Cars equipped with full containment seats will receive a 50 lbs. weight break.
– A head and neck restraint system (SFI 16.1 compliant) is strongly recommended. Drivers using a head and neck restraint will receive a 50 lbs. weight reduction.
– Head and Neck Restraint certifications are good for 5 years from date of SFI certification.
– Full size window nets are MANDATORY
– Fuel cells must have both a vertical and horizontal fire wall to separate from driver compartment
– Fuel lines which run through the cockpit should be fully shielded with a firewall or within
metal conduit.
– All glass and ancillary and unneeded plastic should be removed
– Interiors should be free of debris and sharp edges
– Batteries must be securely attached inside engine compartment or may be relocated inside a securely mounted box. Must use positive fasteners and hardware – NO BUNGIE CORDS or
RATCHET STRAPS. Wet cell batteries that are inside the driver compartment MUST be covered with a non-conductive cover (plastic or rubber).