The Napier is a complicated extrapolation of a basic opposed-piston engine. Your average “engine” has cylinders and pistons ...

The free piston engine, a design with opposed pistons working against compressed air springs and combining both compression and firing strokes in a single axis, doesn’t turn anything in itself ...

While most engines made in the last 100 years have adhered to the standard single-piston per-cylinder design, the TS3, also known as the "Commer Knocker," is an exception. The opposed-piston ...

A recent patent application has been published in the U.S., filed on August 12, 2015 detailing “a rotary piston engine mounted on a vehicle.” According to the patent’s abstract, the engine ...

A rotary engine uses rotational movement of triangular rotors to turn the wheels, as opposed to a conventional engine, which converts piston movement into rotary movement of the wheels.