The Light Pro Stock Class is a black smoke, diesel tractor class. This class derived from our Classic Super Stock class. The main modifications, from the Classic Super Stocks were increased cubic inches and larger turbo size. The average horsepower for this class is approximately 1200 horsepower. This is a diesel fuel only class. The turbo charger is a 3.15 compressor wheel with unlimited turbo wheel outlet. Within our current class, the cubic inches varies between 504 to 540 with the maximum cubes allowed being 540. Maximum cut tire size of 24.5 x 32 push the ground speeds between 26 and 28 MPH. The cylinder block must be from the same (tractor) manufacturer and bolt into place without modifications. Hood, grill, transmission, frame, rear end and axle must maintain stock appearance. Maximum wheel base is 114″ measured center axle to center axle. This diverse group of pullers has all the main tractor manufacturers in this class: John Deere, International, Ford, Allis Chalmers. This ground-eating, black smoke tractor class is a very crowd-pleasing pulling class!
TIRES: Maximum 24.5×32
AGE OF DRIVER: 18 years or older
FUEL: Diesel Fuel only, water injection ok, no combustible fuels in water
CYLINDER BLOCK OR CRANK CASE: Must be from same manufacturer and must bolt in stock location without modification. All engines must be 540 cubic inches or smaller. All engine upgrades must be approved by the committee.
HEADS: Cast iron heads only. Must be from same manufacturer. No over head cams allowed.
INJECTOR PUMPS, ONE ONLY: P – Pump maximum, one plunger per cylinder. No computerized fuel systems allowed.
TURBO: One single stage turbocharger allowed. Compressor cover bore to be no larger than 3.2″ at the face of the wheel. Compressor wheel must protrude at least 1/8″ into the 3.2″ bore. Map Width Enhancement is allowed. The maximum MWE slot width is 0.200″. MWE slot will be measured where the compressor wheel is within the 3.2″ bore. The turbine bore must measure no larger than 3.70″ diameter. All the blades must protrude into this bore. No waste gates will be permitted. No Variable Geometry Turbochargers will be permitted COTPA.
MANIFOLDS: Manifolds must be from same manufacturer and must bolt onto head without modification, alteration for turbo mounting allowed. Combine manifolds OK. No intercoolers.
DRAW BAR: Drawbars must not exceed 20″ in height or less than 18″ from center of axle to hooking point. No part of draw bar may extend rearward beyond point of hook. Drawbars must be stationary in all directions. No clevis.
HOOD, GRILL, FRAME, TRANSMISSION, REAR END, AXLE: Must be for that make and model and must maintain stock appearance. Front ends may be homemade with a maximum of 114” wheelbase. Frames may be homemade but must maintain stock appearance. Upgrades on sheet metal must be approved by the committee.
TOTAL LENGTH OF TRACTOR: Maximum length 13′ from center of rear axle to the furthest point forward, including weights.
SAFETY EQUIPMENT: Helmet, Fire Suit, Wheelie bars, Roll cages, kill switches, fire extinguishers, fenders, side shields, SFI flywheels and pressure plates, scatter blanket or steel shields, no steel fans, all electric fuel pumps must be wired to the kill switch. Wide front axles. No cast iron engine frames. (Ladder bars are recommended).
THE COMMITTEE WILL INTERPRET ALL RULES. ANY UNFORSEEN PROBLEMS OR OVERSIGHTS WILL BE RULED ON BY THE COMMITTEE. ALL COATPA GENERAL RULES APPLY.
Address Questions to:
Wayne Cook 937-477-8968