View source for Template:POTD/2004-07-24

{{POTD {{{1|{{{style|default}}}}}}
|image=Four stroke cycle start.png
|size=300
|title=[[Four-stroke cycle]]
|texttitle=Four-stroke cycle
|caption=The [[four-stroke cycle]] of an [[internal combustion engine]] is the cycle most commonly used for automotive and industrial purposes today, including [[Automobile|cars]], [[truck]]s, and generators.

The cycle was invented by [[Nikolaus Otto]] in [[1876]], and is also called the Otto cycle. The cycle is characterized by four ''strokes'', or straight movements in a single direction, of the [[piston]].
|credit=Photo credit: [[User:Wapcaplet|Eric Pierce]]
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{{Portal POTD/featured|Portal:Technology/Selected pictures#{{FULLPAGENAME}}}}
[[Category:Wikipedia Picture of the day July 2004]]
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