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[[Image:4-Stroke-Engine.gif|framed|right|[[Four-stroke cycle]] (or Otto cycle)]] ...amual Brown in 1823. It was based on what Hardenberg calls the [[Leonardo cycle]], which, as this name implies, was already out of date at that time. Just

...[Wilhelm Maybach]] in the 1870's developed the [[four-stroke cycle]] (Otto cycle) engine. ...thumb|An illustration of several key components in a typical [[four-stroke cycle|four-stroke]] engine]]

[[Image:4-Stroke-Engine.gif|framed|right|[[Four-stroke cycle]] (or Otto cycle)<br />1. intake<br />2. compression<br />3. power<br />4. exhaust]] .... It was compression-less and based on what Hardenberg calls the "Leonardo cycle," which, as this name implies, was already out of date at that time. Just a