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Section 18 - SUPER MODIFIED 2WD TRUCKS (2WD)

Unless specifically outlined below in the class specific rules, the Truck General Rules and the overall General rules outlined above will apply.

18.1 - General Rules

  1. 2WD vehicles will compete at a maximum weight of 6,200 lbs.

  2. Vehicles in this division will adhere to all pertinent criteria of modified tractor safety and construction, unless special variations are noted.

18.2 - Body / Chassis

  1. Tubular steel frame is allowed

  2. The maximum length of the vehicle is no more than 15 feet from the centerline of rear axle to forward most portion of the vehicle including the weight racks.

  3. The 15 feet from center of rear axle overall rule will apply to all 2WD vehicles with the exception of a ten (10) inch over-length allowance for cosmetic fiberglass only. No steel structure, reinforcement, or steel bumpers allowed past 15 feet. Tow hook to be consistent with 15-foot rule.

  4. Maximum width of vehicle is eight (8) feet.

  5. Chassis (frame) may be truck frame or fabricated frame like modified tractors.

  6. Vehicle appearance:

    1. Fiberglass hood scoops, spoilers, fender flares are allowed.

    2. Allowed to use stock appearing pickup truck and van fiberglass bodies and parts.

    3. All 2WD vehicles must have a presentable front windshield of glass, Plexiglass or Lexan. Does not have to be a full windshield.

  7. Fuel injection, carburetors and headers may protrude through the hood.

  8. Any factory production body truck or van is allowed including passenger-type bodies.

  9. Vehicle needs to conform to provisions of the modified tractor engine shielding.

18.3 - Engine

  1. The engine is any engine, or its replica, available in a passenger car. For a replica to be considered legal it must accept and swing a stock crankshaft.

  2. Must have a 3-point engine mount and a support saddle for the rear of the transmission.

  3. 2WD OTTPA competition – a limit of 650 cubic inches and two (2) valves per cylinder.

  4. There will be no timing delay devices allowed.

  5. All boosted V8 motors limited to a maximum 5” bore spacing.

  6. Engine can have a maximum of eight (8) cylinders.

  7. Diesel engines are not allowed.

  8. Except for high performance type starters with crankshaft drive, rear of engine block may not be moved forward of center line of front axle.

NOTE: “Entire engine” is to mean anything that is bolted to the engine block.

18.4 - Superchargers

  1. Maximum super charger limit is 14-71 hi-helix, no screw type super chargers permitted.

18.5 - Turbochargers

  1. Allow only single staged turbochargers in the division and must therefore follow the safety rules that apply to all turbocharged engines which are found in the General Rules Section under Supercharger/Turbocharger.

18.6 - Exhaust

  1. Vehicles must have vertical exiting exhaust.

  2. Height of pipe must be a minimum of one (1) foot above the bend.
    NOTE: Vertical is defined as “being in plumb” with a 10-degree variance in any direction permitted.

18.7 - Tires, Wheels

  1. Must run a minimum of 14-inch front rims with an automotive or front tractor tire.

  2. Any wheelbase is permitted.

  3. Front wheel and axle are to remain in the visual center of the front wheel well. Must maintain a minimum of two (2) inches of complete original type wheelhouse forward of front wheel. Must be able to see forward most part and rearward most part of tire from a side view.

  4. Rear tire diameter shall not exceed 143-inch circumference when mounted on an 18-inch rim and inflated to 28 PSI. The ground patch is not to exceed 19 inches based on the original tread.

18.8 - Weights

  1. Weights are not to extend forward of maximum length stated in Rule 1 under the Body/Chassis section above, not rearward more than 12 inches from hitch point and must not interfere with hitching and unhitching of vehicle.

18.9 - Driveline / Clutch

  1. Torque converters, automatic shifts, etc. are permitted.

  2. Engine to clutch to transmission to be constructed like the modified tractors.

  3. No electronic, pneumatic or hydraulic devices that affect the clutch system are allowed.

  4. All staged or variable released clutches of any description prohibited. (This does not affect slave cylinder for clutch pedal.)

  5. All 2WD vehicles engine/automatic transmission combinations must have either:

    1. Two front engine mounts, two rear engine mounts, and a support saddle for rear of transmission, with ½ inch maximum clearance.

    2. Two front engine mounts, support saddle at rear of engine, with ½ inch nylon strap in the middle of that span to secure the driveshaft to the frame.

18.10 - Fuel & Water

  1. VP Racing Fuel is the only fuel that is allowed for use in all pulling vehicles.

  2. A \$50 fine will be assessed for lack of fuel and water test ports for all classes.

  3. A \$50 fine will be assessed for any minor infractions of fuel or water quality.

NOTE: A bubble or hood scoop is optional. If used, the scoop or bubble must cover the carburetors or fuel injection if the induction system protrudes through the hood.