IAMO 2009 Winners
 Iowa - Missouri Truck & Tractor Pullers                                      Since 1997
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4.1 Turbo Limited Pro Stock Tractors

Weight

 

  1. 9,500 lbs

Chassis

    1.  Component chassis are NOT allowed.

Engine

 

  1. 640 cubic inch maximum displacement allowed. + or -1%.
  2. Engine cylinder head must be OEM agricultural type for the brand of engine.  Port location must be the same as stock with stock manifolds using stock manifold bolt pattern.
  3. Aftermarket manifolds allowed but must bolt in original port bolt pattern.
  4. Not overhead cams allowed.
  5. No inner or after coolers allowed.

Fuel System/Turbo

    1.  Any single "P-Series" injection pump allowed.  NO Sigma Pumps.

    2.  Any single 4.1" smooth bore inlet turbo.

Tires

 

  1. Maximum tire size allowed is 24.5 x 32.  Tread width not to exceed 25".
  2. Front tires may be no smaller than 7.50 x 15 or 7.5L x 15 on any rim width.

 

Safety

 

  1. All drivers must wear a DOT approved helmet and neck collar.  A minimum single-layer fire suit, shoes, head sock, and gloves.
  2. Five Point Harness required.
  3. All exhaust must be discharged upward.  No curved stack or rain caps allowed.  Two 3/8 inch diameter bolts placed 90 degrees apart must be bolted through the exhaust as close to the turbo as possible.
  4. All tractors must have skid bars that will individually support the tractor weighted to its heaviest class.  Skid bars must not be higher than 10 inches off the ground and at least 32 inches from center of rear axle.
  5. Tractors must be equipped with a working air shut off (diesel engines) or ignition kill (gas).  A 2 inch ring must be attached to the end, and be positioned 48 inches above point of hook, and be no more than six inches off center and must be able to be pulled form the driver's seat.
  6. All tractors must have a spring-loaded return to idle throttle.
  7. If the tractor has a PTO, it must be covered.
  8. Tractors must be equipped with full side shields that cover engine below crank shaft centerline.  They must be a minimum of .060 inch thick steel or aluminum.  They must be easily removed.
  9. All tractors are required to have a white reverse backup-light.
  10. All inline pump tractors must have a fuel shut-off that has a three-way diverter valve and must run back to the fuel tank.  It must be able to be pulled from the dash by the driver.
  11. Roll cages must be SFI approved.
  12. All tractors must have a quick release steering wheel, swing-away column or factory-tilt column or steering wheel.
  13. Must have 3/8 inch cable between 1-2 cylinders with 2 clamps.
  14. All tractors must be equipped with a fire extinguisher within reach of the driver.
  15. Tractor Skid Plate-Front axle skid plate specs: