Unlike all other forms of NTPA “Stock” classes, the alcohol tractors do not blow plumes of black smoke. In the “Open” division, most of the engines have been modified to run on methanol fuel, although rarely fans will see a diesel fueled Super Stock joining in the fray. From their tube frame component chassis to their highly modified engine, these aren’t your granddad’s John Deere, Case IH, or various other brand models found in agriculture – hardly! These machine can create in excess of 5,000 horsepower weighing 8,000 lbs. The “Super Stock Open” class generates more power than any NTPA “stock” division. These International and John Deere machines produce around 2,500 to 3,000 horsepower with their “stock engine” having up to four turbo chargers flowing the air mixture. As the name implies, diesel is the only fuel allowed in the Super Stock Diesel division. Although they may appear “stock” on the outside, they produce many times over their factory rated horsepower. You might call the “Super Stock” an unlimited version of the “farm” appearing tractor classes. Chassis setup, gearing, tire pressure, and the driver all must be perfect to win in this division. With no turbo charger or super charger to force air into the engine, a competitor in this division must rely on the engine itself to pump as much air as possible and that means that engine settings like the proper air/fuel ratio are more important than ever. Perhaps the closest in appearance to what the average pulling fan drives on the street, the Modified Four Wheel Drive trucks are also the only “naturally aspirated” division in NTPA competition and utilize both rear and front wheels to pull.
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