Mods

MODIFIED RULES

SAFETY

1. Fire resistant uniforms are required of all drivers.

2. Fire resistant underwear, socks & gloves are highly recommended.

3. Halon fire extinguisher system is highly recommended.
4. The firewall at front of cockpit should be constructed to protect the driver against fire from the engine compartment. It should be fully constructed of metal to minimize airflow from the engine compartment into the cockpit and contain no holes or gaps.

5. Driver’s seat must be of a proper racing seat design and installed on the left side of the car and securely attached to the frame as per manufacturer’s specifications.

6. The use of at least a five-point safety harness including a crotch belt is required. The system is to be mounted to the frame and not to the floor pan. The mounts must be run at the same direction as the belts are intended to secure the driver. Belts and harness are recommended to be no more than one year old.

7. Head and neck restraints are highly recommended.

8. All competitors must wear a SA 95 or a SA 2000 full coverage helmet during all competition events.

9. Solid steering wheel for protection of wrists is recommended.

10. All cars must have a suitable steel cage in driver’s compartment including headrest. Roll cage must be welded to the frame and extend above the driver’s helmet.

11. Driver door bars must be as close to parallel to the ground as possible and located perpendicular to the driver for maximum driver protection and easy accessibility. The side bars must be welded to the front and rear of the roll cage members. No brazing or soldering is permitted. Door bars that have a thickness of .095” (ninety-five one-thousandths of an inch) or less must have at least 1 1/2” (one and a half inch) diameter.

12. Protection of feet is mandatory. A bar across the back of the engine with vertical bars and rub rails or similar protection is sufficient.

13. Side roll bars are mandatory and must extend into the door panels.

14. Roll cage must consist of continuous hoops that are no less than 1 1/2” (one and a half inches) outside diameter and must have a wall thickness of at least .095” (ninety-five one-thousandths of an inch).

15. Roll cage must be frame-mounted in a minimum of 6 (six) places.

16. Roll cage must consist of a configuration of front and rear hoops connected by tubing on the sides or side hoops. Driver’s head must not protrude above cage with helmet on. Roll cage must be securely supported and braced.

FRAMES

1. Factory production full 1964 or newer parallel American passenger car frames only. Frames may be cut in rear only at point not farther than 36” (thirty-six inches) from center f rear end housing. Frames must be complete in front of firewall. No cutting of frame in any way in front of firewall!

2. No Jeep, Bronco, 4-wheel drive or sports car frames are allowed. No front wheel drives.

3. Minimum wheelbase is 108” (one hundred and eight inches). Maximum wheelbase is 112” (one hundred and twelve inches).

4. Rear of frame may be altered to accept leaf or coil springs. Any coil spring must be at least 4 1/2” (four and one-half inches) outside diameter.

5. No fiberglass lift bars are permitted. No rear torsion bars are permitted.

6. Frames may not be widened or narrowed and must be able to support roll cage on both sides. Must be full and complete on both sides. Front cross member may be notched for radiator clearance only. Minimum frame and body height from ground is 4” (four inches).

7. Front bumper must be mounted to the ends of the frame with the bottom loop parallel to the ground. Minimum of 1 1/2” (one and one-half inch) pipe is required to support the car when being towed. Rear bumpers may be constructed of pipe or flat stock and must protect the fuel cell. Center of bumpers (front and rear) must have 18” (eighteen inches) of ground clearance with a 2” (two inches) tolerance. Rear bumper, Nerf bars and bodies must not extend beyond width of rear tires and must not contain any sharp edges.

8. No brace bars forward of the cage may be higher than stock hood height.

9. No rear push-bars to extend beyond 6” (six inches) of rear quarter panel.

FUEL SYSTEMS

1. All cars must have fuel cells - 32 (thirty-two) gallons maximum capacity. Fuel cell must be completely enclosed in 18-gauge steel container. No aluminum allowed. All fuel cells must be completely visible. All cells must have a minimum of 2 (two) 2” (two inch) x 1/8” (one-eighth of an inch) steel straps surrounding them. Fuel cells must be protected in rear of axle by securely-mounted roll cage tubing.

2. One 2 (two) or 4 (four) barrel carburetor is allowed. Must be naturally aspirated.

3. No fuel injection systems or electric fuel pumps are permitted.

4. No part of fuel cell may be lower than protective tubing.

5. Racing gasoline or alcohol is permitted. No nitrous oxide, nitrous methane, propylene oxide or any type of additives are permitted. Fuel may be checked at any time.

6. All fuel cells must have check valve in breather for prevention of fire in a rollover.

ENGINES

1. Any American made engine may be used as long as the rear of the engine bell housing flange is mounted at least 72” (seventy-two inches) forward from the center of the rear axle. Engine offset must be kept within 2” (two inches) of center line from cross member. Engine height minimum is 11” (eleven inches) from ground to front center of crankshaft.

2. All engines must be able to be used in a conventional passenger car without alteration. Motor mounts cannot be removed or altered. Castings and fittings may not be altered. No machine work on the outside of the engine or on the front or rear of the crankshaft is permitted.

3. No aluminum blocks are permitted. Aluminum heads O.K. with 50 lb. in front of bell housing.

4. No magnetos are permitted.

5. No total dry sump systems are allowed. Wet systems must be operative and will go with a claim.

6. Cooling systems may be altered or modified if stock-appearing hood line is maintained.

7. Batteries must be securely mounted and shielded. Batteries may not be mounted inside driver’s cockpit.

8. Exhaust systems must be mounted in such a way as to direct spent gases away from areas of possible fuel spillage. All headers must be pointed away from ground, horizontal and preferably outside of car. No more than 1/2” (one-half inch) clearance surrounding header pipe when directed through firewall on driver’s side. Mufflers may be required at certain tracks.

ENGINE CLAIMS

1. Any driver wishing to make a claim must have taken the checkered flag in the feature and be on the same lap as the leader. The claim must be made in cash or certified check to promoter within 5 (five) minutes after the completion of the feature. The driver must have the claim payment and his/her – a third party cannot provide these items to the claiming driver. A driver can claim another driver’s engine only once during the year. Only the engine of the event winner can be claimed. In case of multiple claims on the same engine, the engine will go to a qualified driver who finished the furthest back in the field on the lead lap. No driver may claim an engine if he/she has spun out and caused a caution period. If a claim is refused, the claim is not held against the claiming driver. The motivation behind claiming is to keep the prices affordable and create competitive racing.

2. Any driver making a claim must drive his/her car immediately after the finish of the feature, under its own power, directly to the claiming area. Only drivers and officials are allowed in the claiming area. Claiming area must be designated by the promoter to all drivers at the driver’s meeting prior to the feature event. The feature winner must go to the claiming area immediately following the finish of the feature event. If no driver comes immediately to the claiming area, the winner may proceed to the pits.

3. The claimed engine must be completely removed within 1(one) hour from the time the claim is made.

4. The first sell/no sell or trade of the engine by the driver being claimed is considered binding.

5. Only a qualified driver may claim an engine and only the winning driver may agree to sell.

ROOF & ROOF SUPPORTS

(see drawing diagram for reference)
1. Side vents on front roof posts can extend back no further than 16” (sixteen inches) on the bottom, then straight up to roof for 1 configuration, side vents must meet outside of car.

2. All race cars must meet the measurements illustrated in the drawing.

WEIGHT

1. All added weights must be painted white or a bright color with the driver’s number clearly painted on each piece.

2. All added weights must be securely mounted to car with minimum of 2 (two) 1/2” (one-half inch) bolts through each weight. No weights may be mounted on rear bumper or outside the body of the car. All added weight must be mounted below all windows and interior sheet metal.

3. Due to the high risk factor involved, any car that loses lead weight during an event may be fined up to $500.00.

4. Minimum weight of car with driver at all times including after the race is 2,400 (two-thousand four-hundred) pounds.

5. All weight determinations will be measured on the scales selected for each racing event. Zero tolerance is strictly enforced. No burn off is allowed.

GAUGES/ELECTRONICS

No transmitting or listening devices, timing retard controls, or digital gauges (including tach). No electronic monitoring computer devices capable of storing or transmitting information except analog tach. No adjustable ignition control boxes. Only one 12-volt ignition box allowed, must be out of driver’s reach. No additional ignition accessories allowed. Only change allowed to ignition box is one high-end rev-limiter setting. This setting can be changed through one chip only, or an internal setting inside box. No electronic traction control devices ($10,000 fine).

BODY (See diagram)

Must be same width, front to rear, and parallel to OEMframe. Engine compartment must remain open (no side panels). Hood must be enclosed at rear. No panel in front of right door to engine compartment. No inner panels. No car covers. Must have front windshield and rear window support posts. Driver and passenger side windows must have at least 12-inch opening, measured at center of window, between lowest point at top of window, whether roof or roll cage, and highest point at bottom of window, whether interior or body. May use Lexan in opera windows. May use full windshield and rear window. Must be fiberglass full size roof, rounded in all directions. Three-inch single plane spoiler allowed. Maximum 4-inch plastic skirting allowed on bottom of doors and quarters. No reflective doors or quarter panels. Outside of tires must be widest part of car.

REAR END

Any steel approved OEM passenger car or truck rear end allowed. Safety hubs (floater) allowed. All components must be steel, except lowering blocks, axle cap, and drive flange. Inspection hole in housing is required. Full steel spool, steel mini spool or welded rearends only. Steel axles only. No quick change devices, or cambered rear ends. One piece drive flange only. No torque dividing differentials. No scalloped ring gears.

TIRES/WHEELS

Must run Hoosier IMCA tires.

BRAKES

Must be steel approved OEM, operative four wheel, drum or disc. Must maintain minimum OEM dimensions for hubs/rotors and calipers, cannot be lightened. Bolt pattern may be changed. Larger studs allowed. Rear rotors may be aftermarket, min. 0.810-inch thickness. Vented rotors only, no scalloped rotors. No brake shut-off or pressure sensitive devices. One proportioning device allowed, front to rear only. Brake lines must be visible.

1. All cars must be equipped with a working braking system on all four wheels and all four wheels must lock up at all times.

2. Steel rotors only. No carbon fiber or aluminum. No drilling, lightening or alteration brake rotors or calipers are permitted. All calipers must be O.E.M.

3. No single disc brake rotors are permitted. No scalloped rotors are permitted. Must be O.E.M.

BATTERY/STARTER

One 12-volt battery only, must be shielded. Must have capability of starting without being pushed or pulled. Must leave initial staging area on demand, unaided, or go to rear of that race.

DRIVETRAIN & SUSPENSION

1. All drive shafts must be painted silver or white. No aluminum, fiberglass, or carbon fiber drive shafts are permitted.

2. A 1/2” (one-half inch) x 2” (two inches) 18-gauge steel drive shaft loop is mandatory. Loop must be at least 6” (six inches) behind U-joint.

3. Drives are encouraged to perform systematic checks on their drivetrain to help reduce maintenance-related driveshaft problems. U.M.P recommends that competitors seriously evaluate their car and related components to reduce the potential risk for injury for driveshaft-related incidents.

4. No direct drives allowed. Transmission must be bolted to engine. All cars must have forward and reverse gears and be able to shift to forward or reverse with engine running. BERT-type transmissions are allowed.
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5. Clutch type transmissions must be equipped with explosion-proof steel bell housing. If no explosion-proof bell housing is available for your engine, or if you prefer, you may construct a shield of at least 1/2” (one-half inch) x 6” (six inches) steel covering the clutch area 360 degrees and be securely fastened.

6. Steering box must be O.E.M. No rack and pinions are allowed. Must use original bolt patter that matches frame type. In cockpit, steering may be modified to suit the driver but must remain on the left side. No center steering is permitted.

7. Any passenger car or truck rear end is permitted except no aluminum is allowed other than lowering blocks, axle cap and drive plate.

8. No “live axle” rear ends. No quick change devices.

9. No independent rear suspensions.

10. Floater hub assembly only.

11. Front suspension must be O.E.M. and be in stock location. Must be replaceable by stock part from same type of suspension.

12. No aluminum shocks, shells, hubs, A-frames, rear-end or other suspension parts are permitted.

13. No coils over shocks are permitted on front of car. No homemade coil overs are allowed – no exceptions.

14. Steel coil-over eliminators or steel/aluminum coil-over kits allowed-must conform to shock and spring rules. (Rear only) (5 inch spring).

15. One shock per wheel only. No lay down shocks less than 12” (twelve inches) away from brake rotor. Additional shocks in other locations are permissible. Any shock may be claimed for $120.00.

16. Stock passenger car spindles only. No fabricated spindles are permitted.

17. Lower A-frames cannot be altered or moved. Pre-approved after-market lower control arms are legal but must remain in factory location. All after-market lower control arms must have an official U.M.P.-approved and numbered sticker at all times.

18. Tube type upper A-frames are allowed and may be moved.

19. Composite leaf springs are permitted.

20. Aluminum shackles are permitted.