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TIRES
Maximum 20.8x38
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AGE OF DRIVER
18 years or older
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FUEL
Diesel Fuel only, water injection ok. No combustible fuels in water
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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.
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HEADS
Cast iron heads only. Must be from same manufacturer. No over head cams allowed.
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INJECTQR PUMPS. ONE ONLY
P Pump maximum, one plunger per cylinder. No computerized fuel systems allowed.
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TURBO. ONE ONLY. MANIFOLDS
One single stage turbo allowed. Maximum 3" compressor wheel. The wheel may be no larger than this measurement at the inlet. Tips of wheel must protrude into opening at least 1/4". No slots or grooves. All air must enter the compressor housing inlet. No external altering of compressor housings. Any size exhaust outlet and housing. Turbo must not extend through hood. Manifolds must be from same manufacturer and must bolt onto head without modification, alteration for turbo mounting allowed. Combine manifolds OK. No intercoolers.
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RPMs OPEN
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DRAW BAR
Drawbars must not exceed 20 inches in height or less than 18 inches 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.
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HOOD. GRJLL. 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.
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TOTAL LENGTH OF TRACTOR
Maximum length 13' from center of rear axle to the furthest point forward, including weights.
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SAFETY EQUIPMENT
Helmet, Fire Suit, Wheelie bars, Roll cages, kill switches, fire extinguishers, fenders, side shields, SF1 flywheels and pressure plates, scatter blanket or steel shields, no steel fens, all electric fuel pumps must be wired to the kill switch. Wide front axles. No cast iron engine frames. (Ladder bars are recommended).