Enid Speedway Park rules follow the NCRA modified rules.
1. SEATS; Only custom manufactured aluminum seats, acceptable to Speedway officials, will be permitted.
The seat must be properly installed. All seats will have padded rib protectors. An adequate padded head rest acceptable to Speedway officials is mandatory.
2. SEATBELTS & SHOULDER HARNESSES; A lever type quick release latch must be fastened to the lap belt. A lap belt not less than 3” inches is mandatory. Both ends of the lap belt must be fastened to the roll cage with high quality bolts not less than 3/8” inch diameter. The shoulder harness must be no less than 3” inches wide and must be attached to a roll bar behind the drivers seat. Where the harness crosses the roll cage, it must pass through a steel guide welded to the roll cage that will prevent the harness from sliding side to side. Shoulder harness inertia reels will not be permitted. A center (crotch) belt must be securely mounted to the lower seat frame at the bottom and to the lap belt at the top. Where the belts pass through the seat edges, it must have a grommet installed, be rolled, and or padded to prevent cutting of the belt. Alll seat belts and shoulder harnesses must connect at the lap belt with a quick release buckle acceptable to Speedway officials. Seat belts should not be used beyond (5) years. The date of manufacture should remain visible at all times. All cars should have either and approved window net in the drivers door or 2 arm restraints. Arm restraints shall be functional, you will be checked before you go on to the race track, if they are used properly you will not be allowed out of the staging area.
3. DRIVER UNIFORM; It will be required that at all times the driver wear a driving suit, shoes and gloves of fire resistance material that effectively covers the body. It is highly recommended that driver use a Snell SFA 3-2A/5 uniform with full nomex underwear.
4. HELMETS; Driver will be required to wear a full face helmet at all times while practicing or in competition. It is recommended that that helmets meet the specifications set forth in the Federal Motor Vehicle Safety Standard Regulation or meet the specifications set forth by the American National Standards Institute Inc. All drivers must wear neck brace or helmet restraint at all times.
6. FRAMES; OEM complete. 1964 or newer, perimeter American rear wheel drive passenger car frame only. No sports car frames. Frame must be full and complete, cannot be widened or narrowed, and must be able to support roll cage on both sides, EXCEPT; Weight jack in original center line of spring tower allowed. Frame may be cat a maximum of 36” inches forward from center of rear end housing. Horns may be removed in front of steering box. Front cross members may be notched and boxed for radiator and or steering clearance. Maximum 7” inches wide opening in side of spring tower for spring removal. Maximum 2” inches wide by 4” inches tall frame stiffener may be welded directly to the outside of left side frame rail. Minimum wheel base of 108” inches. Maximum wheel base of 112” inches both sides. Maximum overall width (front to rear) shall not exceed 78” inches from outside of tire to outside of tire. No part of frame can be lower than 4” inches from ground except cross member.
7. FRONT SUSPENSION; All components must be steel, unaltered OEM, in OEM location, and replaceable by OEM parts, EXCEPT; tube type upper A-frames with aluminum or steel cross shafts, and mounts can be moved. OEM replacement tubular control arms OK. Lower A-frames must be right and left and of same design; rubber, nylon, or steel lower A-frame bushings, no offset or bearing type. Welded or bolt on shock mount on lower A-frame. Lower A-frame mounts and bolt holes on frame must be in OEM location.
8. STEERING; All components must be steel, unaltered OEM, in OEM location, EXCEPT; outer tie rod end and adjustment sleeve may be replaced by a minimum .625 inch steel rod end and steel tube; spindles can be ground for brake caliper clearance only. Unaltered OEM replacement Pinto spindles, raised cast, spindles must be right and left and of same design. Bolt on spindle savers allowed. Steel steering shafts and knuckles only. Steering quickener, steering wheel and quick release may be aluminum. Cock pit steering may be modified, must kept on left side. No rack and pinion.
9. SHOCKS; One steel, nonadjustable, unaltered shock per wheel. One additional shock allowed on rear suspension. No threaded body, front coil over, air , or remote reservoir shocks. No Schrader valves.
10. SPRINGS; Steel or composite leaf spring allowed. One coil and or leaf spring per wheel only. One additional spring allowed on pull bar of lift bar, may be progressive. Any coil spring. No torsion bars or air bags.
11; REAR SUSPENSION; All components must be steel. No covers allowed. All trailing arms/link bars must be solid tubing. Rear of frame may be altered to accept leaf or coil springs. Steel coil over eliminators or steel/aluminum coil over kits allowed. Must conform to shock and spring rules. One mechanical traction bar (pull or lift, NOT both).
12. REAREND; Any steel approved rearend allowed. Safety hubs (floater) allowed. All components must be steel except lowering blocks, cap and drive flange. Full steel spool, steel mini spool, or welded rearend only. Steel axles only. No cambered rearends. One piece drive flange only. No torque dividing differentials allowed. No scalloped ring gears. Steel quick change rear ends are allowed.
13. BUMPERS/RUB RAILS; Steel only. Bumpers must be used both front and rear at all times and welded, or mounted with bolts. Must be minimum 1.25 inch O.D. tubing. .065 inch wall thickness on front. .095 inch wall thickness on rear. Two bar front bumpers must be mounted frame end to frame end no wider than width of material outside of frame rails and with bottom loop parallel to ground. Top bar must be directly above bottom bar, minimum 6.5” inches apart, measured center to center. Rear bumpers and nerf bars can be no wider than tires with sharp edges removed on either end.
14. TIRES AND WHEELS; May run either Hoosier or American Racer IMCA type G-60 tires only. Any 8” inch steel wheel.
15. 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 may be used. Rear rotors may be aftermarket, minimum 0.0810 inch thickness. Vented rotors only. No scalloped rotors. No brake shut offs or pressure sensitive devices. One proportioning device allowed, front to rear only, brake lines must be visible.
16. EXHAUST; Round tube headers only. All primary header tubes must enter directly into one collector at same point at end of header and point rearward.
17. FUEL SYSTEM; Racing fuel cell required. Maximum 32 gallons capacity. Must be in 18 gauge steel container. Cell must be securely mounted behind rear axel, between tires, minimum of 4” inches ahead of bumper, minimum of 10” inches above ground. Must be mounted with a minimum of two .125” inch thick solid steel straps, 2” inches wide around entire cell. All cell mounts must be steel, securely welded to frame/cage. Protective tubing must cover rear and extend past both sides of cell. No part of cell shall be lower than protective tubing. Fuel cell vents including cap must have check valves. Pick up must be on top or right side of cell. Limit one fuel filter. No cool cans or caps.
No top flow air cleaner housings. One naturally aspirated 2 or 4 barrel carburetor only. No adjustable carb spacers.
18. FUEL; Gasoline or alcohol. No performance enhancing additives. Upper cylinder lube allowed. Fuel sample may be taken from any car at any time.
19. BATTERY/STARTER; one battery only. Must be shielded and securely mounted between frame rails. Must have capability of starting without being pulled or pushed. Must leave initial staging area on demand, unaided or go to the back of that race.
20. GAUGES/ELETRONICS; 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 drivers 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.
21. TRANSMISSION/DRIVESHAFT; Must have at least one gear forward and one gear reverse, plus a neutral position. With motor running and car in a still position, driver must be able to engage car in gear and move forward, then backward. Layne, Ernieglide, Bert and Brinn transmission will be allowed as well as any OEM transmission. No five speed transmissions, in or out boxes, or quickchange devises allowed. Functioning shifter must be in stock location on transmission manufactured after 1995. All manual gear type transmissions must have standard OEM case and must have a working disc type or approved cone type clutch inside and a explosion proof bell housing. Automatic transmission must remain in OEM stock appearing automatic case. Original bell housing must remain. Must have approved scatter shield or blanket. Scattershield may be constructed of 25” inch by 3” inch steel, 270 degrees around flexplate or flywheel.
22. ENGINE COMPARTMENT; Rear of engine (bell housing flange) must be at least 72” inches forward of centerline or rear axle. Engine offset must be kept within 2” inches of centerline of front cross member with engine level. Minimum 11” inches engine height from ground to center of crankshaft. Radiator must be mounted in front of engine. Cooling system may be modified.
23. ENGINE SPECIFICATIONS; Any American make engine allowed. Steel heads, block and oil pan only. All engines must be able to be used in conventional passenger cars without alterations. Engine mounts cannot be removed or altered. Castings and fittings must not be changed. No machine work on outside of engine. “Wet” oiling systems only.
24. WEIGHT; Minimum weight limit of 2,450 pounds, No tolerance, after race with driver.
Weights must not be used in drivers compartment or outside of the body or hood area. Any weights added to other areas of vehicles must be securely mounted and painted white and have car number on it, and attached with two .5” inch bolts. No titanium, magnesium, or carbon fiber products. No gun drilled, tubular, or hollow bolts or studs. Steel fasteners only.
25. ASPIRATION; One two barrel or one four barrel carburetor OK. Must be naturally aspirated. No fuel injection, No electric fuel pumps.
26. SPOILERS; A rear spoiler not exceeding 5” inches of total material and not exceeding the width of the rear deck. A maximum of 4 tapered supports may be installed in front of the spoiler no higher than the spoiler.
27. BODIES;
(A) 1970 or newer American compact passenger car only, no panel cars or station wagons. Stock appearing front windshield or rear window support unit, painted roll bars not acceptable substitute. May utilize a flat half windshield, with no wings, mounted to the roll cage. Must have a minimum of three windshield bars in front of driver. (B) Firewall and floorboards are mandatory. All body parts should be recognizable as factory production vehicle. Fiberglass or metal duplicates of body parts are permitted. Homemade body parts may be constructed of steel, aluminum, or fiberglass. All cars in competition must have a complete paint job. Body must be the same width, front to rear, and all parallel to the frame. (C) Original roof line of vehicle must closely be maintained. Must be full size roof. No wings or any other ground effects are allowed anywhere outside or inside the car. Sail panels must closely resemble examples shown on body diagram and be the same on both sides of car. Any reinforcing lips on rear of sail panel must be 180 degree bends. (D) All cars must be numbered with large legible numbers on both sides, on top and rear panel. Numbers on sides and top of car must be in contrasting color from body, be at least four inches thick and at least 20 inches high. (E) Sponsor’s names must not interfere with car numbers and must be neatly lettered. (F) Engine compartment will remain open, no side panels; hood sides may have maximum four inch drop and must be enclosed at rear of hood; maximum hood scoop height----six inches. Passenger side of body must be no further forward than rear of block.
(G) (optional) Rear of bodies to be solid panel at least eight inches high and include car number. (H) No panel in front of right door to engine compartment. No inner panels. No car covers. (I) Driver and passenger side windows must have at least 12-inch opening, measured at center of window, whether the roof or roll cage, and the highest point at the bottom of window, whether the interior or body.
28. DRIVER COMPARTMENT:
Must have minimum three windshield bars in front of driver. Aluminum high back seat only and must be bolted in next to left side frame rail and ahead of rear tires. Bottom of seat can be no lower than bottom of frame rail. Driver must be sealed off from track, driveline, engine, fuel cell, canisters, and pumps. Oil coolers must not protrude above interior. Accumulators cannot be mounted between driver and left side door bars. No driver adjustable devices while car is in competition except brake adjuster. No mirrors or reflective sun visors.
29. ROLL CAGE:
Must consist of continuous hoops. Minimum 1.75 inch O.D. tubing with a minimum wall thickness of .095 inch for main cage. Frame mounted in at least six places (low carbon or mild steel recommended). Must consist of a configuration of front, rear and top hoops connected by tubing on sides or side hoops. Driver’s head must not protrude outside cage with helmet on. Roll cage must be securely supported and braced with minimum one cross bar in top halo. Foot protection bar required. Main cage no further forward than rear of engine. All bars forward of cage must be lower than hood.
REMEMBER IF IT DOES NOT SAY YOU CAN…THEN YOU CAN’T!
PROMOTER RESERVES THE RIGHT TO CHANGE OR CLARIFY ANY RULES TO IMPROVE COMPETITION, SAFETY OR COST.