NEW for 2026: we will be following PPL fuel & water standards. Diesel fuel standards on the dielectric    constant test are greater than 30 and less than 150. Pullers can use their OWN water in 2026. No oxygen carriers or    combustion accelerators allowed in water injection. Only  water-soluble oil permitted in water injection. Water injection    maximum reading on efractoneter is 5.0  (updated 9/2025)

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Engines  

1) No engine larger than 680 CID (plus 1%).  

2) Tractors are limited to one pressure stage and allowed one (1) air compressing device.  

3) Tractors may use a steel plate, maximum of one (1) inch thick, between the block and the head.

4) Tractors are limited to two (2) valves per cylinder.  

5) No intercoolers allowed.  

6) ONLY turbo allowed is from Wimer 

7) Wimer cross bolt mechanism is mandatory 

 

Safety  

1) Metal detec on shield between driver and engine from top of hood to top of torque tube or transmission housing or clutch housing from side shield to side shield. This also serves as a flash fire shield.  

2) Safety blankets must be on the inside of the e bar and the e bar must be fastened forward of the rear of the engine block. 3) Tractors that require tools for the removal of side shield must be equipped with onboard fire control system. On board system nozzles must be in engine compartment.  

 

Tires 24.5 – 32 maximum size.