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

They were in-line two-cylinder and in-line three-cylinder engines. Ferrari's Two-Cylinder Engine: The 252 F1 Ferrari's endeavor to develop a two-cylinder engine was short-lived. In the 1950s ...

Two-cylinder power! [Tom’s] ultimate goal is to put his new tiny air engine on a small model aircraft. To enable consistent performance, his engine needs a regulator, but off-the-shelf models ...