1. Rules: All General Rules and Safety Rules apply to the Turbo Class unless otherwise specified in the following rules.
2. Engine: Engine, not to exeed 640 ci, must be of same manufacture as tractor with the same number of cylinders (i.e. an International tractor must have an International engine). Engine must bolt in manufacturer’s intended location.
3. Intercooler: Only factory equipped intercoolers using engine coolant allowed.
4. Engine RPM: Engine is not to exceed 3000 RPM under no-load conditions. Throttle arm must hit stop screw on injector pump. Each tractor will be checked while in line and waiting to hook. R.P.M. to be checked by Tech Committee with photo-tach or other means furnished by the AFPA.
5. Charger / lnjector Pump Setup: 3m 3out small foot: any pump up to and including a bosh p pump is allowed. Bushings: Reducing bushings or sleeves will not be permitted in either case. Bolt-ons: Tractors built as naturally aspirated may use bolt on Turbochargers. Water Injection: Water injection allowed. No pressurized tank systems are allowed.
6. Maximum tire sizes: 20.8 x 38 any cut tires allowed.
Protest Rule: If a tractor is protested, the protest must be made to a member of the Tech Committee by a competitor in same class either before the pull starts or before the tractor in question leaves the pulling track. A protest fee of $500 must be paid by protester, which will go to protestee if the tractor is found to be legal. All points and prize money for that pull will be forfeited, protest fee returned to protester, and protestee barred from pulling at club sanctioned pulls for one year, if tractor found to be illegal or refusal of tear down.