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Section 34 - LIMITED MINI-ROD TRACTORS (LMRT)

Unless specifically outlined below in the class specific rules, the Tractor General Rules and the overall General rules outlined above will apply.

34.1 - General Rules

  1. Supercharged engines are allowed to weigh 1,950 lbs.

  2. Naturally Aspirated engines over 512 cubic inches and up to 575 cubic inches are allowed to weigh 2,000 lbs.

  3. Naturally Aspirated engines 512 cubic inches and less than are allowed to weigh 2,050 lbs.

  4. Diesel powered tractors allowed to weigh 2300 lbs

  5. No portion of the tractor shall exceed 8 feet forward of the center of the rear wheel.

  6. Tread width (footprint) not to exceed 6 feet in width.

  7. Both driver’s feet must rest inside the main frame rails and even with or behind rear of bellhousing while seated inside roll cage with 5pt. restraint harness fastened.

  8. Brake pedals must be mounted directly ahead of foot rest and inside the main frame rails.

  9. Feet and brake pedals must remain inside the main frame rails and behind the engine block plate during brake pedal application.

  10. Must have a fuel shut off valve within reach of the drivers seat.

34.2 - Tires

  1. Maximum tire size is 18.4 x 16.1 with a maximum of 143-inch circumference when mounted on an 18-inch-wide rim and inflated to 10 psi.

  2. The ground patch is to not exceed 19 inches on original tread.

  3. No tire repairs (boots, section repair, vulcanized spots, etc.;) will be allowed.

34.3 - Engine

  1. Mini-Rod tractors are limited to:

    1. A maximum of 575 cubic inches for a naturally aspirated engine

    2. A maximum of 380 cubic inches for a 6-71 supercharged small block w/10% overdrive high helix or standard rotors on ay heads excluding LS heads at 2000lbs.

    3. Maximum 380 cubic inch small block with a 8-71 supercharger on 23-degree heads only, overdrive is limited to 0% on high helix rotors and 7% on standard rotors at 2000lbs

    4. A maximum of one (1) Lycoming T-53 L-13 engine. All engine safety requirements that are required in the Light Limited Modified class are required.

    5. Diesels allowed with a maximum of 250 cubic inches, maximum 4 cylinders, maximum of 2 valves per cylinder limited to a single turbo. No variable turbos permitted

  2. All engines are limited to (2) valves per cylinder.

  3. Engines are limited to (1) spark plug per cylinder.

  4. No LS Heads allowed

  5. No Turbos Allowed

  6. No forms of control allowed, including grid systems.

  7. Engine Mounts, use one of the following methods:

    1. Two rear engine mounts, and a support saddle for rear of transmission, with 1/2 –inch maximum clearance

    2. Two front engine mounts, support saddle at rear of engine, with ½ inch clearance, and a mount at rear of transmission.

NOTE: This is to prevent the engine or transmission from dropping if breakage occurs.

  1. Must have SFI Spec 14.1 blower restraints.

34.4 - Driveline Shielding

  1. Mini-Rod tractors must meet general tractor shielding and safety criteria.

  2. All drivetrain, excluding additional manual transmission, must be enclosed in 5/16″ minimum steel or 3/8″ inch aluminum, round, inside diameter not to exceed 2 inches more that the outside diameter of the largest universal joint, fastened every 6 inches or closer, with 3/8″-inch or larger bolts, Grade #5, or butt and seam welded, and securely mounted to vehicle’s frame. Applies to all vehicles with exposed driveshaft. No more than ¼ -inch of end of driveline shall be visible with driveline shielding in place.

34.5 - Drawbar / Hitch

  1. Drawbar height to be 13″

  2. Diesels allowed height to be 15”

  3. Drawbar length to be no shorter than 6″.

  4. Drawbar and hitching device to be one-piece construction, with a minimum of 1-inch solid steel material.

  5. No hollow tubing is permitted.

  6. Front part of drawbar is to have a minimum of ½-inch cross sectional thickness to remain on the front side of hole where drilled.

  7. Minimum ½ -inch pin.

  8. Drawbar height adjuster or hold up/down device to be no more than 5 inches from hook point. There must be a minimum of ½ inch metal remaining where hole is drilled. Hose clamps may not be used for any drawbar related devices.

  9. The drawbar receiver or the material where the front of the drawbar is attached must have a minimum of 1/4 –inch thick metal on each side of the horizontal pin drawbar.

  10. The point of hook is to have a minimum of a 2-inch round hole, maximum of 2-1/4 inch hole.

  11. The thickness of material around the hole must be a minimum ¾-inch thick.

  12. Point of hook to be no more than 3/4-inch cross sectional thickness.

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34.6 – Front Skid Plate

  1. Skid Plate required on all vehicles at all levels in this division. Front skid plate to be configured according to diagram and dimensions as follows:

    1. Skid plate must be made from .125-inch steel and extend across under front of chassis - rail to rail and solidly attached

    2. Skid plate formed at 90 degrees with a minimum 2.500-inch radius at bottom front of skid

    3. Tow hitch placed minimum 7.500 inches from ground

    4. Skid plate to extend rearward under chassis to center of front axle

    5. Bottom of skid plate to be at or bellow bottom of front rim.