Rules B Mod

little302

Nut behind the wheel
MOD Rules


1. ROLL CAGE: Must consist of continuous hoops, minimum 1.5” O.D. tubing with a minimum wall thickness of .095” 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. Drivers head must not protrude outside cage with helmet on. Roll cage must be s...ecure 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.

2. DOOR BARS: All drivers’ side door bars and uprights must be minimum 1.5” O.D. and .083” wall thickness. Minimum three driver side door bars, parallel to ground & perpendicular to driver, and welded to front and rear of roll cage, passenger side must have at least one cross door bar, horizontal or angled, minimum 1.25” O.D. & .083” wall thickness, and one top door bar, minimum 1.5” O.D. & .083” wall thickness, steel door plate 18 gauge or .049” minimum thickness, must be securely welded to outside of driver side door bars and cover area from top door bar to bottom door bar and from rear hoop down post to 5 inches in front of seat. MUST BE VISABLE FOR INSPECTION.

3. SAFETY: Rules apply at all times car is on track. Snell rated SA95 or SA2000 helmets are required. SR approved full suit, gloves and shoes required. Recommended fire retardant head sock and underwear, head and neck restraints.
Driver side window net required and must be mounted so latch is at top front of window or arm restraints. Minimum three inch wide five point safety belt assembly required. Must be mounted securely to roll cage, recommended to be no more than three years old. Kill switch required within easy reach of driver and must be cleanly marked “OFF” and “ON”. A small Fire extinguisher compartment is mandatory.

4. FRAME: OEM complete 1964 or newer, perimeter American rear-wheel drive passenger car frame only. No sports car frames. Frames must be full & 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 cut a maximum 36 inches forward from center or rear housing: horns may be removed in front of steering box: front cross member may be notched and boxed for radiator and /or steering clearance: Maximum seven inch wide opening in side of spring tower for spring removal. Maximum two inches wide by four inch tall frame stiffener may be welded directly to outside, both sides. Maximum overall width (front or rear) shall not exceed 78 inches from outside of tire. Nor part of frame can be lower than four inches from ground except front cross member.

5. BODY: Must be same width, front to rear, and parallel to OEM frames. 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 sail panels, may use full windshield. Must be fiberglass or aluminum full size roof rounded in all directions. (Roof escape panel is allowed) plastic skirting allowed on bottom of doors and quarters. Outside of tires must be widest part of car. 5” spoilers allowed. Spoiler supports no more than 5” tall in rear, 2” tall in front and 12” long.

6. DRIVER COMPARTMENT: Must have a minimum of three windshield bars in front of driver. Lexan or aluminum cowl panel in front of driver can be no wider than cockpit and no farther back than steering wheel. Minimum .125 inch aluminum or .060 inch steel complete floor pan required. 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 race track, driveline, engine, fuel cell, canisters and pumps. Accumulators cannot be mounted between driver and left side door bars. No devices that would enable driver adjustment to alter wheelbase or for weight jacking while car is in competition. No mirrors or reflective sun visors.

7. FRONT SUSPENSION: All compartments must be steel, unaltered OEM, in OEM location and replaced by OEM parts, except tube type upper A-frames with or without aluminum/steel cross shaft & mounts can be moved. OEM replacement lower A-frames bushings only, no offset or bearing type. All lower A-frame mounts and bolt holes on frame must be in stock location. Lower A frame must be right & left & of same design: rubber, nylon , or steel lower A frame bushings, no offset or bearing type: welded or bolted shock mount on lower A frame. Lower A frame mounts & bolt holes on frame must be in OEM location. OEM ball joints only. Sway bar must be unaltered OEM. After market lower A-Frames are legal.

8. STEERING: All components must be steel, unaltered OEM, in OEM location except outer tie rod end & 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: spindles must be right and left, and of the same design; bolt on spindle savers allowed; steel steering shafts and knuckles only. Steering quickener, steering wheel and quick release may be aluminum. Cockpit steering may be modified, must be kept on left side. No rack and pinion.

9. SHOCKS: One steel non-adjustable unaltered shock per wheel. One additional shock allowed on rear suspension. No bumpers or stops, no threaded body, front coil over, air or remote reservoir shocks. Front half may be shielded. No Schrader valves.

10. SPRINGS: One steel, non progressive coil spring and/or steel leaf spring per wheel only. One additional spring allowed on pull bar or lift bar, may be progressive. Any coil spring must be at least 4.5 O.D. 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 frames 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 bar not both).

12. 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 driver flange. Inspection hole in housing is required. Full steel spool, steel mini spool or welded rear ends only. Steel axles only. No quick change devices, or cambered rear ends. One piece drive flange only. No torque dividing differentials.


13. BUMPERS AND RUB RAILS: Steel only. Bumpers must be used both front and rear at all times and welded or mounted with minimum .375-inch bolts. Must be minimum 1.25-inch O.D. tubing, .065 wall thickness on front, .095 wall thickness on rear. Two-bar front bumpers must be mounted to frame-end to frame-end, no wider than width of material outside frame horns 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 bumper and nerf bars can be no wider than tires.

14. TIRES AND WHEELS: Hoosier IMCA G-60 (KK704) E-MOD A Tire H Tire
tires only. Grooving, siping and or grinding of tires is allowed. No re-caps. Aluminum or steel spacers only. May use I.M.C.A. Approved bead lock, on right rear only. External , steel bead lock only and if cannot make wheel any narrower than 8 inches and no wider than 8.75 inches. Must use only steel bolts. Driver can run mud plugs on all 4 wheels. Rim-mounted bleeder valves allowed.

15. BRAKES: Must be steel approved EIM, operative four wheel, drum or disc. Must maintain 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.

16. EXHAUST: Round tube headers only. All primary header tubes must enter directly into one collector, at same point, at end of header. No exhaust sensors. Must run mufflers.

17. FUEL SYSTEM: Mechanical fuel pump only and must be mounted at front of engine. Racing fuel cell required, maximum 32-gallon capacity, must be in minimum 18 gauge steel container. Cell must be securely mounted behind rear axle, between rear tires, minimum of four inches ahead of bumper, minimum of ten inches above ground. Must mount with minimum two .125-inch thick solid steel straps, two inches wide around entire cell. All cell mounts must be steel, securely welded to frame/cage. Protective tubing must cover rear & extend past both sides of cell. No part of cell shall be lower than protective tubing. Fuel cell vents, including cap vent, must have check valves. Pick up must be on top or right side of cell. Limit of one fuel filter. No cool cans. One naturally aspirated 2-barrel 500 cfm 13/8” century carburetor only. May remove chock horn. No aerosol carbs allowed.

18. FUEL: Must be gasoline. NO performance-enhancing additives. Upper cylinder lube allowed. Fuel sample may be taken from any car at any time. Penalty for illegal fuel is disqualifications from event and $250 fine – first offense. No Alcohol. E-85 allowe.

19. WEIGHT: Minimum weight limit of 2,600 pounds, no tolerance, after race with driver in car. No weight and /or loose objects in driver compartment or outside body. Weights must be securely mounted to frame or roll cage and painted white with car number on it. Must be attached with at least two .5 –inch bolts. No titanium, magnesium. No gun-drilled, tubular, hollow bolts or studs.

20. BATTERY AND STARTER: One 12-volt battery only, must be shielded & securely mounted between frame rails. 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. Reverse-mount starters with OEM case transmissions only.

21: GAUGES AND 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 along 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 changed 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)

22: TRANSMISSION AND DRIVESHAFT: Must have at least two forward gears & one reverse, plus a neutral position. With engine running and car in still position, must be able to engage car in gear & move forward, then backward. Three speed, four speed and automatic. No five speed (or more) transmissions, in & out boxes, or quick change devices allowed. Functioning shift levers, must be in OEM location on all OEM production type transmissions. Flex plates must be full steel, unaltered OEM or OEM replacement. Flywheel/flex plate must bolt to engine between clutch assembly & crankshaft & all driving components within bell housing must rotate while car is in any gear. Transmission must be one of the following designs:
MANUAL: Must have a standard OEM cast & working disc-type clutch or approved cone or disc type coupler inside an explosion proof steel bell housing. One fly wheel only, minimum 8.5 inches diameter. Diameter of clutch disc must be a minimum of 5.5 inches. Clutch assembly must be steel, except housing, which must be steel and/or aluminum. Bell housing can have only a hole for throw out bearing lever or hose, must be 270 degrees around top of clutch and flywheel area. Standard or reverse mount starter allowed, must directly engage flywheel. No internal clutch type transmissions, except automatics.

AUTOMATIC: Must remain in OEM or OEM replacement case with a functioning OEM appearing pump. Must have an approved scatter shield. Scatter shield must be constructed of minimum of .125-inch by three-inch steel, 270 degrees around flex plate.
DRIVE SHAFT: Minimum two-inch diameter steel drive shaft & must be painted white. Steel slip-yokes only. 360-degree drive shaft loop required and must be constructed of least .25-inch by two inch steel, or one inch tubing, mounted six inches back from U-joint.

23: ENGINE LOCATION: Rear of engine (bell housing flange) must be mounted at least 72 inches forward from the centerline of rear axle. Engines offset must be kept within 2 inches of centerline of front cross member with engine level. Minimum 11-inch engine height from ground to center of crankshaft. Radiator must be mounted in front of engine. Cooling system may be modified. Overflow tubes must be directed to ground between frame rails.

24. ENGINE SPECIFICATIONS: Any American made engine allowed. Steel heads block & oil pan only. All engines must be able to be used in conventional passenger car without alterations. Engine mounts cannot be removed or altered. Castings and fittings must not be changed. Wet oiling system only. No Roller cams.
 
Any G-60 tire allowed Hoosier or American Racer, A or H Emod . Grooving ,siping , or grinding allowed.
 




Back
Top