Class Rules & Regs

RULES Super Modified A heads up no breakout eliminator embracing the use of both naturally aspirated and nitrous oxide enhanced engines, clutch style transmissions and data logging combined with limited tuning. DESIGNATION SM, followed by car number Requirements and specifications ENGINE: SM 1 SM 1.1 CARBURETTOR Any automotive carburettors with any internal modifications permitted. Any mechanical fuel injection system permitted. Maximum 8 throttle bores. No electronic fuel injection. No superchargers. No turbochargers. SM 1.2 CYLINDER HEADS Hemi, canted valve or wedge heads permitted. No overhead camshafts. Production style canted valve or wedge heads will be defined by the intake port roof height. Any canted valve or wedge head that measures 3.05" or less, measured vertically to the highest point of the intake port entry on the intake face with the head laid flat on it's head gasket surface, shall be classed as production style. All other types of canted valve or wedge heads shall be classed as Raised-port style. All heads must be cast with water jackets. No billet heads. No port plates. All heads must retain original valve cover height and profile. Maximum 2 valves per cylinder. SM 1.3 INTAKE VALVES Any material may be used but with maximum head diameter as follows, Pro-Stock and all Hemi heads: 2.40" Production canted valve heads: 2.30" Small Block engines: 2.10" All Rover and Wildcat: 2.10" Tolerance .010" SM 1.4 VALVE SPRINGS Single or dual valve springs only may be used (not including flat wound dampers) with a maximum O.D. as follows: Big Block engines: 1.650" Small Block and Rover engines: 1.55" Tolerance .025" measured as installed with valve seated SM 1.5 CRANKSHAFT STROKE (from 2003) Minimum stroke in inches for all engine combinations can be calculated as follows, Cylinder bore x .862 Stroke tolerance .005" SM 1.6 CYLINDER BLOCK All cylinder blocks, excluding standard Rover and Wildcat Rover, must retain their standard pre 1980 head bolt pattern. All blocks must retain standard cylinder bore and lifter spacing. No dry sump systems. Maximum bore size as follows, Big Block engines: 4.650" Small Block engines: 4.190" Rover based engines: 4.070" Tolerance .005" SM 1.7 NITROUS OXIDE Any commercially available nitrous oxide system may be used in conjunction with the following size supply bottles, All Big and Small Block engines: 1 X 5lb bottle (Part number to follow) Rover based engines: 1 X 10lb bottle (Part number to follow) Big Block Nitrous Engines - Maximum of 2 nitrous solenoids with maximum .090" orifice per solenoid, both of which must be opened simultaneuously. (This will be verified by tech inspectors confirming that earth wires from both solenoids share a common feed). Up to two purge solenoids are permitted and must be vented exclusively to atmosphere behind carburettors. Solenoids must be mounted in a position suitable for east tech access. Nitrous bottle in driver's compartment must be equipped with a relief valve and vented outside of driver's compartment. Bottle must be permanently mounted (no hose clamps or tie wraps). One -4 or -6 supply line only. Must be appropriate length (no huge storage coils please). External heating of bottle other than with electric blanket for the proper use prohibited. See GSR: 1.9 and 9.7 SM 1.8 ENGINE SETBACK Maximum 10 percent of finished wheelbase, measured from the centre-line of front spindle to front spark plug hole. SM 1.9 EXHAUST SYSTEM Competition type exhaust systems required. Exhaust gases must be directed out of the car body, rearward, away from driver and fuel tank. SM 1.10 LIQUID OVERFLOW Mandatory. See GSR: 1.7 SM 1.11 FUEL Gasoline/petrol, methanol and ethanol accepted. Only nitrous oxide in accordance with GSR: 1.9 permitted. See GSR: 1.6, 1.6.1, 1.8, 1.9 and 1.11. SM 1.12 FUEL SYSTEM All fuel cells must have pressure cap and be vented to outside of body. Fuel cells mounted inside trunk require complete bulkhead of at least .024" (.6mm) steel or .032" (.8mm) aluminium to isolate driver compartment from trunk. Fuel lines must be located outside of driver's compartment. Fuel tanks not to be higher than that of rear tyres. Front mounted cells permitted, must be protected from collision damage by the frame or by a protective bar of minimum dimensions 1 1/4" o.d. x .065" chrome moly or 1 1/4" o.d. x .118" mild steel tubing See GSR 1.5. DRIVE TRAIN: SM 2 SM 2.1 CLUTCH, FLYWHEEL, FLYWHEEL SHIELD Maximum 2 disc clutch. Pressed steel clutch cover plates only. Flywheel and clutch must meet SFI spec. 1.1 or 1.2. Flywheel shield must meet SFI spec 6.1 or 6.3. Clutch release must be manually operated by the drivers foot. Electronics, pneumatics, hydraulics or any other device may in no way affect the clutch operation. See GSR: 2.3, 2.5, 2.6 and 2.10 SM 2.2 DRIVELINE Drive shaft loop mandatory. See GSR: 2.4 SM 2.3 REAREND No independent rear suspension. After market axles and axle-retention device mandatory. See GSR: 2.2 and 2.11. SM 2.4 TRANSMISSION, automatic Spring-loaded, positive reverse lockout device and functional neutral switch mandatory. Transmission shield meeting SFI spec 4.1 mandatory. Automatic transmission flex-plate meeting SFI spec 29.1 and flex-plate shield meeting SFI spec 30.1 mandatory. See GSR: 2.14. BRAKES AND SUSPENSION: SM 3 SM 3.1 BRAKES Four wheel disc brakes mandatory. See GSR: 3.1 SM 3.2 STEERING See GSR: 3.3 and 4.1 SM 3.3 SUSPENSION Full automotive-type suspension mandatory. Minimum one operating hydraulic shock absorber per wheel. Lightening of stock components prohibited. Rigid mounted suspensions prohibited. See GSR: 3.2, 3.4 and 3.5. SM 3.4 WHEELIE BARS Permitted. Wheels must be non metallic. See GSR: 3.6. FRAME: SM 4 SM 4.1 BALLAST Permitted. See GSR: 4.2 SM 4.2 GROUND CLEARANCE Minimum 3 inches (76mm) from front of car to 12 inches (305mm) behind centre line of front axle, 2 inches for remainder of car, except oil pan and headers. See GSR: 4.5 SM 4.3 PARACHUTE Mandatory. See GSR: 4.8 SM 4.4 ROLL CAGE All cars must have chassis inspected every 3 years by the ASN and have serialised sticker affixed to frame before participation. See GSR: 4.4, 4.11 and 4.11.1 SM 4.5 WHEELBASE Minimum 90 inches (2286mm) Maximum 115 inches (2921mm) TYRES AND WHEELS: SM 5 SM 5.1 TYRES Racing slicks permitted. See GSR: 5.1 SM 5.2 WHEELS Must be automotive type wheels suitable for street use. Maximum rim diameter 15 inches. Wheel studs must be threaded into hex portion of lug nut a distance at least equal to the diameter of the stud. See GSR: 5.2 INTERIOR: SM 6 SM 6.1 SEATS Properly braced, framed and supported seats constructed of aluminium, composite material, double layer poly, fibreglass or carbon fibre (automotive accessory seats) permitted. See GSR: 6.2 SM 6.2 SHEET METAL Driver compartment interior must be aluminium, steel or fibreglass. Magnesium prohibited. See GSR: 6.1 and 7.5 SM 6.3 WINDOW NET Mandatory. See GSR: 6.3 BODY: SM 7 SM 7.1 AIRFOILS Non O.E.M. airfoils or wings permitted. Must be permanently attached to frame or roll cage. Non adjustable during run. See GSR: 7.2 SM 7.2 BODY All cars must have full body. Original O.E.M. body or replica shell mandatory. Chopping, channelling, sectioning or other alterations to contour length or width permitted as long as the body can be identified with original appearance. One piece bodies prohibited. Funny car bodies prohibited. Driver must sit on either left or right side of driveshaft. Must have two driver exits. SM 7.3 FIREWALL Mandatory. See GSR: 1.1, 4.3, 6.1 and 7.5 SM 7.4 FLOOR Mandatory. See GSR: 6.1 and 7.6 SM 7.5 WINDSHIELD, WINDOWS Mandatory. Must be in good condition and free from cracks. May be replaced with shatterproof material, 1/8" (3.2mm) minimum thickness. See GSR: 7.8 and 7.9 ELECTRICAL: SM 8 SM 8.1 BATTERY Batteries must be securely mounted, may not be located in driver compartment. See GSR: 8.1 SM 8.2 MASTER CUT OFF Mandatory. See GSR: 8.4 SM 8.3 TAIL LIGHTS Must have one functional tail light for night operations. Flashing, blinking or strobe lights prohibited. See GSR: 8.6 SUPPORT GROUP: SM 9 SM 9.1 COMPUTER/DATA RECORDERS Data recorders permitted. See GSR 9.1 and 9.2 SM 9.2 FIRE EXTINGUISHER SYSTEM Mandatory. See GSR: 9.3 SM 9.4 TOW VEHICLES Permitted. See GSR: 9.9 SM 9.5 WARMS See GSR: 9.4 and 9.11 DRIVER: SM 10 See GSR 10.1, 10.2, 10.4, 10.5, 10.6, 10.7, 10.8, 10.9, 10.10. WEIGHT BREAKS 2001 & 2002 Minimum weight Big Block, 2,300lbs Small block (wedge head only), 2,250lbs Rover Wildcat heads, 2,150lbs Rover standard heads, 1,850lbs Big Block engines using Pro-Stock or Hemi heads - 4.5lbs per cu.in, net intake valve lift limited to .700" measured at zero lash Big Block engines using Production heads - 4.15lbs cu.in. Big Block Nitrous Engines: Net intake valve limited to .600" at zero lash Small Block engines (wedge head only) - 5.0lbs cu.in. All Rover heads - 5.0lbs cu.in. Engines using nitrous oxide - add 1.15lbs cu.in. Cars using clutch - add 100lbs An absolute maximum .025" tolerance is permitted on restricted intake lift to account for valve lash and deflection DRIVER CREDENTIALS AND PROTECTIVE CLOTHING REFER WHITE BOOK. PLEASE NOTE SOME SIGNIFICANT SAFETY REGS WILL CHANGE FOR CARS THAT RUN FASTER THAN 7.50.