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...e water pumps in the [[17th century]]. In 1794, [[Robert Street]] built a compression-less engine whose principle of operation would dominate for nearly a centur ...sel engine]]s and [[HCCI]] engines) rely on the heat created in the air by compression in the engine's cylinders to ignite the fuel.

...of the piston) instead of four, although the same four operations (intake, compression, power, exhaust) still occur. Thus, there is a power stroke per piston for ...a [[spark plug]] to ignite the fuel. Diesels rely on the heat of very high compression to ignite the fuel. Fuel is sprayed into the hot compressed air and ignites

[[Image:Four stroke cycle compression.jpg|thumb|An illustration of several key components in a typical [[four-str ...) chamber around an eccentric shaft. The four phases of operation (intake, compression, power, exhaust) take place in separate locations, instead of one single lo

...mmon [[four-stroke cycle]] by completing the same four operations (intake, compression, power, exhaust) in only two strokes (linear movements of the piston) rathe ...]] to ignite the fuel. Diesels rely on the heat generated by the very high compression to ignite the fuel. Fuel is sprayed into the hot compressed air and ignites

...|framed|right|[[Four-stroke cycle]] (or Otto cycle)<br />1. intake<br />2. compression<br />3. power<br />4. exhaust]] ...e of [[Physical compression|compression]] and in particular of in-cylinder compression.

...ing [[oxygen]] (usually atmospheric air), rather than a separate source of ignition [[energy]] (such as a [[spark plug]]), as is the case in the [[gasoline eng ...of an [[intercooler|aftercooler/intercooler]] to cool the intake air after compression by the turbocharger further increases efficiency.