![]() ![]() The fourth stroke, known as the exhaust stroke, evacuates the resulting exhaust gases by having the piston move up to top dead center, pushing out the gases. The combustion forces the piston back down to bottom dead center. ![]() The third stroke, known as the ignition or combustion stroke, ignites the air and fuel mixture, causing combustion. The second stroke, known as the compression stroke, compresses the air and fuel mixture as the piston moves up towards top dead center. The first stroke, known as the intake or aspiration stroke, draws in air and fuel as the piston moves from top dead center to bottom dead center. This cycle works in four up-and-down cylinder motions (known as strokes). This can be done by a variety of means, but in Automation, all engines operate on the Otto cycle, the 4-stroke engine cycle used by most gasoline (petrol) powered cars. The goal of an engine is to convert chemical energy of the fuel into rotational kinetic energy. In order to understand how to design an engine, you must first know what an engine does, and how it works.
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