Watch This See-Thru Rotary Engine Run in Slow Motion on Three Types of Fuel

The inline configuration is arguably the most common automotive engine design for plenty of reasons, including simplicity and the low cost of producing these motors. We also have plants with the cylinder banks arranged in a V, flat mills, boxers, and oddballs such as the VR and W.

The oddity to rule them all, however, is the pistonless rotary engine that converts pressure into rotating motion. More compact and lighter than conventional po…