Cummins 1931 Indy Car: Packard Chassis, Completed the entire race on one tank of fuel. The lineage to the 4BT engine is obvious. Cummins 1950 Indy Entry. Cummins 1952 entry was even more unique, employing a laydown inline 6 engine. It took complete advantage of the rules at the time that allowed a diesel to be up to 401 ci, and no limits on boost, where as gas engines were limited to 183 ci. The Cummins Special set pole by more then 4 mph over the 2nd place V12 powered Ferrari's. It was leading into the late stages of the race when the turbo inlet became fouled and plugged with rubber debris and starved the motor of air.