Naturally Aspirated Tractors

Naturally Aspirated TractorsThe Naturally Aspirated Tractors are the Illiana Pullers Association’s entry-level tractor class. Competitors are limited to factory rated engine speeds (RPMs) with a 700 cubic inch limit. The average diesel-powered vehicles in this class were originally rated at 75 horsepower, now with a few engine modifications, they produce around 300 horsepower and move down the track in an 11 mph gear.