copycheck engine

An engine is a mechanical device that produces some form of output from a given input. When the purpose of an engine is to produce mechanical power from a fuel source it is referred to as a prime mover;
The core of the engine is the cylinder, with the piston moving up and down inside the cylinder. The engine described above has one cylinder. That is typical of most lawn mowers, but most cars have more than one cylinder (four, six and eight cylinders are common). In a multi-cylinder engine, the cylinders usually are arranged in one of three ways: inline, V or flat (also known as horizontally opposed or boxer), as shown in the following figures.