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Section 33 - DIESEL SUPER STOCK TRACTORS (DSS)

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

33.1 - General Rules

  1. Component chassis is allowed in the Super Stock Tractor class.

  2. Diesel Super Stock Tractors will compete at the following weights:

    1. Component chassis tractors will compete at a maximum of 8200 lbs.

    2. OEM Cast chassis tractors will compete at a maximum of 8500 lbs.

33.2 - Tires

  1. Tire size allowed is 30.5 X 32 maximum. See General Tractor Rules for dimensions.

  2. Allow single charger OTTPA tractor to pull at 9000 lbs. on 24.5 x 32 tires.

  3. Allow any 680 cubic inch, any turbo tractor to pull at 8200 lbs. on 24.5 x 32 tires.

33.3 - Engine

  1. Diesel Super Stock tractors may run a one (1) inch deck plate or one 5/8-inch deck plate with two .125 gaskets.

  2. External hold-down devices recommended for holding head to block. This device connects top of the head to the bottom of block and must remain behind side shields. This device does not replace the safety cable, which must remain in place.

  3. Recast blocks allowed.

  4. Diesel Super Stock class is allowed to run Sigma fuel injection pumps. Any plunger sizes.

  5. OEM heads or two (2) valve aftermarket heads are allowed.

  6. No operating inner coolers are allowed.

  7. No overhead cams or hemi-style heads allowed in any Super Stock class.

  8. No electronic fuel injection or electric engine control.

  9. The engine block cannot be modified externally from OEM configuration, except for normal repair or for mounting of fuel injection pumps.

33.4 - Turbocharger

  1. Engines with up to 540 cubic inches are allowed 4 turbos maximum with a maximum of 3 pressure stages.

  2. Engines over 540 up to a max of 640 cubic inches. allowed 2 turbos total.

33.5 - Fuel & Water

  1. Only OTTPA approved fuel and water allowed in the Diesel Super Stock class.

  2. VGM water is the only water injected water that is allowed.

  3. A \$50 fine will be assessed for lack of fuel and water test ports for all classes.

  4. A \$50 fine will be assessed for any minor infractions of fuel or water quality.

  5. No alcohol, alcohol-based substances, other additives and/or formulas containing alcohol of any kind or manner may be used or allowed in water injection.