MICHIGAN TRACTOR PULLERS ASSOCIATION

HOT FARM CLASS RULES - 2012

WEIGHT: 8200lbs & 9200lbs

TIRES: Maximum 24.5 x 32 - any cut

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 overhead cams allowed. 

TURBO, ONE ONLY, MANIFOLDS: One single stage turbo allowed.  Maximum 3.15 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".  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.

RPMs: Open.

DRAWBAR: Drawbars must not exceed 20 inches in height or less that 18 inches from center of axle to hooking point.  No part of

   drawbar 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: Must have the following: helmet, fire suit, wheelie bars, roll cages, kill switches, fire extinguishers, fenders, 

  sides 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, and wide front axles.  No cast iron engine frames.  Ladder bars are recommended.  Tractor must have

  current certification on clutch and flywheel.  Fuel bypass and air shut-off to driver.  3/8" cable around motor between number 1 and

  number 2 cylinders with 6" overlap and 2 clamps.

THE HOT FARM TECH COMMITTEE WILL INTERPRET ALL RULES, ANY UNFORSEEN PROBLEMS OR OVERSIGHTS WILL BE RULED ON BY THE COMMITTEE.  ALL MTPA GENERAL RULES APPLY.