Modified Tractors

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Description

  • Modified tractors are allowed any combination of engines, transmission and final drive.
  • No portion of the vehicle may exceed 14 feet from the center of the rear wheels to the front of the vehicle.
  • The weight of the class is 7500 lbs.
  • Tires are limited to 30.5” wide.

Maximum limitations

  • 4 blown automotive engines.
    Superchargers are limited to 8-71.
    Turbochargers are limited to a single stage.
    No intercooler allowed.
  • 3 blown automotive engines.
    Superchargers are limited to 14-71.
    Turbochargers are limited to a single stage.
    No intercooler allowed.
  • 5 naturally aspirated automotive engines, big blocks.
  • 6 naturally aspirated automotive engines, small blocks.
  • 2 V-12 aircraft engines.
    Maximum of 2 stages of compression per engine.
  • 1 V-12 aircraft engine, plus 1 automotive blown engine.
    Auxiliary stage of compression allowed on the V-12.
    Supercharger is limited to 8-71 on the automotive engine.
  • 2 industrial or marine-type engines.
    Diesel allowed.
  • Maximum of 2 compression stages per engine.
  • 1 JFTD-12 turbine engine, 2 T-55 turbine engines, 2 T-64 turbine engines, 5 T-53 turbine engines.