Duesenberg Cummins Diesel Special
Even though they unveiled the Cummins Diesel Special in 1931, this race car was so far ahead of its time and so unusual, it belongs on this list. So, what was so unusual about this car? First, it was probably the first diesel-powered race car they ever built. In fact, they made it in cooperation with the luxury brand Duesenberg and the engine company Cummins, who specialized in the production of oil burners.
The Cummins Diesel Special had a 360 CID four-cylinder engine with 86 HP. Of course, the power was not substantial by any means, but the car could achieve high top speeds due to lots of torque. Best of all, it could run for 500 miles without fuel stops.