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Animated scheme of a four stroke internal combustion engine, Otto principle: 1. Suction stroke - Air and vaporised fuel are drawn in. 2. Compression stroke - Fuel vapor and air are compressed and ignited. 3. Power stroke - Fuel combusts and piston is pushed downwards. 4. Exhaust stroke - Exhaust is driven out.

Piston N. Gynn is based off A reciprocating engine, also often known as a piston engine. It's a heat engine that uses one or more reciprocating pistons to convert pressure into a rotating motion. This article describes the common features of all types. The main types are: the internal combustion engine, used extensively in motor vehicles; the steam engine, the mainstay of the Industrial Revolution; and the niche application Stirling engine.