Madera Speedway 2012 Sport Mod RULES (same as Chowchilla Speedway)


1. SAFETY EQUIPMENT: Rules apply at all times car is on track. Roll bar padding required in driver compartment (Fire retardant recommended). SFI-approved full fire suit required. Gloves required. Recommended: Fire retardant head sock and underwear; head and neck restraints; collapsible steering shaft. Driver-side window net required, minimum 16 inch by 20 inch ribbon or mesh style, and must be mounted so latch is at top front of window. Minimum three-inch wide SFI-approved five point safety belt assembly required. No older than 3 years. Must be mounted securely to roll cage. Kill switch required within easy reach of driver and must be clearly marked 'OFF' and 'ON'. Helmet must be Snell SA2000 or newer full face. No "M" rated helmets. In 2013, Helmets must be SA2005 or newer.


2. FRAME: 1964 or newer OEM 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, exceptions are: weight jack in original center line of spring tower allowed; frame may be cut a maximum 36 inches forward from center of rear end 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 inch wide by four-inch tall frame stiffener may be welded directly to outside of left side frame rail. Minimum wheelbase 108 inches, maximum 112 inches, both sides. Maximum overall width shall not exceed 78 inches from outside of tire to outside of tire.
No part of frame can be lower than four inches from ground except front cross member.

3. ROLL CAGE: Must consist of continuous hoops, minimum 1.75 inch O.D. tubing, with minimum wall thickness of 0.095 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.

4. DOOR BARS: All driver side door bars and uprights must be minimum 1.5 inch O.D. with 0.083-inch wall thickness. Minimum three driver side door bars, parallel to ground and 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 inch O.D. with 0.083 inch wall thickness, and one top door bar, minimum 1.5 inch O.D. with 0.083 inch wall thickness. Steel door plate, 18 gauge or 0.049 inch 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 five inches in front of seat. Must be visible for inspection.

5. BODY: No composite body panels allowed except roof rock guard hood scoop and spoiler. Body must be same width, front to rear, and parallel to OEM frame. Minimum ground clearance is four inches. 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. Must have front windshield and rear window support posts. Driver and passenger side windows must have at least 12 inch opening (height and width), 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. May be fiberglass or metal, full size roof, rounded down in all directions. Maximum 1.5 inch rolled down rock guard allowed on roof front. Rear spoilers ok, No wider than the body, max height 8 inches. Maximum four 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. Nose piece may have side "fins" that are no more than 2 1/4" high and run the length on the nose piece.

6. DRIVER COMPARTMENT: Must have minimum 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 0.125-inch aluminum, or 0.060-inch steel, complete floor pan required. Aluminum high-back seat only and must be bolted in, using minimum 0.375-inch bolts, 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 allowed while car is in competition except brake adjuster.
No mirrors of any kind.

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

8. STEERING: No rack and pinion. All components must be steel, unaltered OEM, in OEM location, exceptions are: outer tie rod end and adjustment sleeve may be replaced by a minimum 0.625 inch steel rod end and steel tube; spindles can be ground for brake caliper clearance only; unaltered, OEM replacement Pinto spindles with bolt on spindle savers allowed; steel steering shafts and knuckles only; driver compartment steering may be modified, must be kept on left side. Spindles must be right and left, and of same design. Quick release required - steering quickner and steering wheel may be aluminum. Idler arm, pitman arm, and center link must match frame.

9. SHOCKS: One steel, nonadjustable, non-rebuild able sealed unaltered shock per wheel. No bumpers or stops. No threaded body, front coil-over, air, or remote reservoir shocks. No Schrader or bladder type valve allowed. Front half may be shielded.


10. SPRINGS: One steel, non-progressive coil spring per wheel only. Steel multi leaf spring
allowed. Any coil spring must be at least 4.5 inches O.D. No torsion bars, air bags or inner liners.

11a REAR SUSPENSION UNTIL May 20th 2012: All components must be steel. All mounts and brackets must be welded or bolted solid. Coil springs must remain vertical. Coil-over eliminators or steel spring sliders allowed. Nothing may be mounted on lower control arms. Must utilize one of the following designs:
(A) Aftermarket three link design requirements: Must use minimum 16 inch lower control arms equal length left to right. 1/2inch tolerance Must use one upper control arm (pull bar) with biscuit (Maximum 3 biscuits 2 ¼ inch in diameter) located at top center of rear end housing (1-inch tolerance) Must use minimum 23 inch pan hard bar located behind rear end housing.
(B) Multi-leaf spring design requirements: Must use steel multi-leaf springs with no additional suspension components besides one shock per wheel and pull bar with biscuit (Maximum 3 biscuits 2 ¼ inch in diameter) located at top center of rear end housing (1-inch tolerance). Adjustable aluminum lowering blocks allowed.
(C) OEM stock design requirements: Rear cross member, control arm mounts and bolt holes on frame must be in stock location. All components must be unaltered, approved OEM, and match frame. Control arms cannot be altered in any way. Steel, rubber or nylon control arm bushings only. Springs must remain in stock location. Lower spring perch must be welded to rear-end housing. Must use steel upper weight jack.
11b REAR SUSPENSION AFTER May 20th 2012: All components must be steel. All mounts and brackets must be welded or bolted solid. Coil springs must remain vertical and over center line of rear-end housing. No coil-over eliminators allowed. No chains, cables or tethers. Rear shocks cannot be mounted on control arms. All rear control arms and panhard bars must be straight. Must utilize one of the following designs:
(A) Aftermarket three link design requirements: Must use 16 inch minimum, 24 inch maximum lower control arms. Must use one upper control arm, solid tube only, located at top center of rear end housing and remain centered (one inch tolerance) on housing over drive shaft. Must use minimum 23 inch panhard bar located behind rear end housing. Lower spring perch must be welded to rear-end housing. Must use steel upper weight jack. No floating or bearing rear spring perches/cups allowed.
(B) Multi-leaf spring design requirements: Must use steel multi-leaf springs with no additional suspension components besides one shock per wheel. Adjustable aluminum lowering blocks allowed.
(C) OEM stock design requirements: Rear crossmember, control arm mounts and bolt holes on frame must be in stock location. All components must be unaltered, approved OEM, and match frame. Control arms cannot be altered in any way. Steel, rubber or nylon control arm bushings only. Springs must remain in stock location. Lower spring perch must be welded to rear-end housing. Must use steel upper weight jack.

Car not on NSM legal rear suspension after May 2oth, will have to weigh 2650 pounds.

All Sport Mods will have to be NSM rear suspension in 2013.


12. REAR END:
Any steel approved OEM passenger car or truck rear end (housing and carrier) allowed. Safety hubs (floater) allowed. All components must be steel, except lowering blocks, axle cap, and drive flange. Inspection hole required in housing. 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. No scalloped ring gears.

13. BUMPERS: Steel bumpers must be on front and rear at all times and welded, or mounted with minimum .375 inch bolts. Rear bumper must be constructed of solid square, or minimum 1.25 inch O.D. tubing with 0.095 wall thickness, and - similar to diagram - no wider than five inches outside of rear frame rails. If wider than five inches outside rear frame rails, must be capped and bent forward 90 degrees, or constructed in a loop design. Must have at least one upright, minimum 1.25 inch with 0.065-wall
thickness, from bumper to fuel cell guard. Two-bar front bumper must be minimum 1.25 inch O.D. tubing with minimum 0.065 wall thickness (maximum 0.095 inch) mounted 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.

14. TIRES/WHEELS: For Madera Speedway you may use the same tire as the LunkerDaddy Late Models (Hoosier 8.0-15 RIB 700), or you may use the Hoosier dirt tire listed. Must use unaltered Hoosier Race tire, G60-15. No softening, conditioning, or grooving of tires. No re-caps. Aluminum or steel spacers only. Max wheel size 8 inches, steel only. Bead lock, on right rear only. External, steel bead lock only and it cannot make wheel any narrower than 8 inches and no wider than 8.75 inches. Must use only steel bolts. SIPING and GRINDING allowed inside the confines of the tread.

15. BRAKES: Must be steel approved OEM, operative four wheels, 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 0.81-inch thickness (new). No floating rear caliper mounts. Vented rotors only, no scalloped or ceramic coated rotors. No brake shut-off or pressure sensitive devices. One front to rear proportioning device allowed. 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. All exhaust must go through mufflers, two per car, and one per header. No merge collectors. No exhaust sensors.

17. FUEL SYSTEM: Mechanical push rod type fuel pump mounted in stock location only. Racing fuel cell required, maximum 32-gallon capacity must be in minimum 20 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 solid steel straps around entire cell, two inches wide and 0.125 inch thick. 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 vent, must have check valves. If fuel cell does not have aircraft style positive seal filler neck/cap system - a flapper, spring
or ball type filler rollover valve is required. Pick-up must be on top or right side of cell. Limit of one fuel filter. No cool cans. Air cleaner top/stud cannot direct air into carburetor. No top flow air cleaner housings. Holley #4412 or Aftermarket 500 CFM two-barrel carburetor only. Must fit Holley 4412 go no-go tech gauge. GM CRATE ENGINE: may use any Holley 4 barrel carburetor, all components (float bowls and main body) must be Holley manufactured. Metering blocks and base plate may be billet aluminum non-Holley. No aerosol-style carburetors allowed. May use Speedway Motors part #545-64940 or Moroso part #64940 carburetor spacer on crate. Must use MSD #8728 rev-control and 6,200 rpm chip

18. FUEL: Gasoline only. Racing fuel allowed. Pump grade recommended. No E85. No performance enhancing or scented additives. Fuel must pass both dielectric meter and chemical tests. Fuel sample may be taken from any car at any time.

19. WEIGHT: Minimum weight limit of 2500 pounds,(2650 pounds for cars not meeting the suspension requirements after May 20th 2011) no tolerance, after race with driver in car. Weights must not be used in driver compartment or outside body. All weights must be securely mounted with at least two 0.5-inch bolts, painted white with car number on it. No titanium, magnesium, stainless steel or carbon fiber components. Solid steel fasteners only.

20. BATTERY/STARTER: One 12-volt battery only, must be securely mounted between frame rails, and positive terminal must be covered. Car must have capability of starting without being pushed or pulled. Car must leave initial staging area on demand, unaided, or go to rear of that race. Starters must be mounted in stock location.

21. GAUGES/ELECTRONICS: No unapproved cameras, 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. 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 magnetos. No electronic traction control devices. Radios OK. Crate engine must use MSD #8728 rev-control and 6,200 rpm chip.

22. TRANSMISSION/DRIVE SHAFT: All forward and reverse gears must be operational, plus a neutral position. With engine running and car in still position, driver must be able to engage car in gear and move forward, then backward. Only OEM production transmissions allowed. No 'in and out' boxes or quick-change devices allowed. Functioning shift levers must be in OEM location. One steel or aluminum OEM style/size flywheel or steel OEM style/size flex plate allowed, must be bolted directly to end of crankshaft.
Automatic: Must remain in OEM or OEM replacement case, with a functioning OEM appearing pump. Aluminum OEM bell housing may be replaced with aftermarket explosion-proof aluminum bell housing. Original OEM bell housing must have approved scatter shield constructed of minimum 0.125-inch by three-inch steel, 270 degrees around flex plate. Manual: Must be unaltered, three or four speed, OEM production case and have a working 7.25 inch minimum diameter, steel and/or aluminum, single or multi-disc clutch and pressure plate bolted directly to flywheel/flex plate. These components must rotate, consistent with engine rpm, while car is in any gear. Must use explosion-proof steel bell housing with one hole for throw out bearing lever or hose, must be 270 degrees around top of clutch and flywheel/flex plate area. Hydraulic clutch pedal allowed with
manual transmission only.

Drive Shaft: Minimum two-inch diameter, white, steel drive shaft. Steel slip-yokes only. 360-degree drive shaft loop required and must be constructed of at least 0.25 inch by two inch steel, or one inch tubing, mounted six inches back from front U-joint.

23. ENGINE COMPARTMENT: Rear of engine (bell housing flange) must be mounted at least 72 inches forward from centerline of rear axle. Engine offset must be kept within two 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: Through 2012 only. Any American make engine allowed. MAX COMPRESSION RATIO: 11.5 to 1.Chevrolet Max CI.350 +.060.Ford Max CI. 351 + .060.Dodge Max CI. 360 + .060. All motors must obtain cubic inch from stock stroke of motor being used. No stroked or de-stroked motors allowed. Steel heads, block and oil pan only. OEM passenger vehicle production block only. No GM Bowtie, Ford SVO or Chrysler W blocks. Flat tappet cam/lifters and stud-mounted rocker arms only. No stud girdles. No mushroom lifters, cannot alter lifter bores. OEM firing order cannot be changed. No crank triggers. 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. No machine work on outside of engine. All belt driven accessories must be on front of engine. 'Wet' sump oiling system only.

CRATE ENGINE: Must use unaltered sealed GM #88958602 or #19258602 crate engine. Upon inspection, any different, altered or missing GM seal bolts will result in disqualification