IHRA Official Rulebook

TRANSMISSION: Any OEM type transmission permitted. Neutral safety switch required. WHEELBASE: Minimum: 90” unless car has original engine and OEM is shorter. Wheelbase variation left to right: 1” maximum. WHEELS & TIRES: Must be automotive-type wheels suitable for street use. Racing slicks permitted. Automotive wire wheels or motorcycle wheels prohibited. Minimum wheel size is 13” unless originally equipped with smaller wheels and is using the original engine. Recap tires prohibited. GENERAL REGULATIONS ALL CLASSES ALL CARS MUST PASS TECHNICAL SAFETY INSPECTION BEFORE ANY RUNS ARE MADE ANYTHING NOT STATED AS BEING ALLOWED IN THIS RULE BOOK IS NOT PERMITTED, UNLESS AUTHORIZED BY TECH DIRECTOR OR RACE DIRECTOR. AIR FOILS : Permitted. See class requirements for specific information. ALCOHOL : All racing alcohol/methanol must pass every test mandated by the IHRA Technical Department. No deviation from the federal standards of purity will be accepted. SPECIFICATIONS FOR PURE METHANOL: Property...............................................Grade A.........................Grade AA Methanol content, wt percentage, min ....99.85............................99.85 Acetone and aldehydes, ppm, max ........30.................................30 Acid (as acetic acid), ppm, max .............30.................................30 Water content, ppm, max .......................1500.............................1000 Specific gravity, 20c............................... .7928........................... .7928 Permanganate time, min .......................30 ................................30 Odor ....................................................Characteristic Acetone, ppm, max ...............................20 Ethanol, ppm, max ................................10 ALIGNMENT: Each car in competition, regardless of class, must have sufficient positive caster incorporated into the front end alignment to insure proper handling at all speeds. ANTI-BLOW BACK DEVICE: If mandated by class requirements, a brace or device must be installed that will prevent the bellhousing or adapter shield from being blown rearward in the event of flywheel and/or clutch explosion. Material required is 4130 chrome moly, minimum size is .875 x .083-inch wall tubing with 3/8 inch fasteners. Ball-lock pins prohibited. AUTHORITY: Any condition considered to be unsafe by any member of the Technical Dept. will be adequate grounds for barring or withdrawing a vehicle from participation in any event, until the fault has been remedied to the satisfaction of Technical Dept. The decision of the Technical Dept. will be considered final in all Inspection, Classification and Elimination protests or procedures. The National Race Director’s decision is final in all cases and he has the right to vary the allotted time between rounds, race procedures, and rules. APPEARANCE: Vehicles participating in drag racing events must be presentable in appearance at all times. Ones that are considered improperly prepared may be rejected by the technical committee at any sanctioned event. The appearance of personnel attending contestant vehicles is equally important, and should be subject to the same considerations. BALLAST: Any material used for the purpose of adding to a car’s total weight must be permanently attached as a part of the car’s structure, and may not extend behind the rear of the body or above the height of the rear tires. No liquid or loose ballast bags, (i.e. water, sand bags, rock, etc.), allowed. Dragsters will be limited to a maximum of 200 lbs. of ballast. This ballast must be so placed and constructed as not to constitute a hazard. The ballast must remain in the car at all times. Removable weight must be securely fastened to the frame or frame structure by at least two steel bolts, 1/2” minimum diameter. Any removable weight must not be attached to the front axle with hose clamps, wire strapping, etc. See drawing for attaching methods. Recommended forms of ballast are: heavier gauge steel floors - i.e. 16 or 18 gauge, etc. Distillation range at 101 kPa ..................Not more than 1˚C including (760mmHg)..........................................64.6 +/-0.1˚C at 760mm Hg Color, platinum-cobalt scale, mix ...........5...................................5 Appearance ..........................................clear-colorless Residual on evaporation, g/100ml ..........001...............................001 Carbonizable impurities: color platinum-cobalt scale, max ...................30 ................................30

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IHRA