Four-stroke engine

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A topic known well beyond its field, found in many languages.

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What Wikipedia says

A four-stroke (also four-cycle) engine is an internal combustion engine (ICE or IC engine) in which the piston completes four separate strokes while turning the crankshaft. A stroke refers to the full travel of the piston along the cylinder, in either direction. The four separate strokes are termed:

Excerpt from the Wikipedia article “Four-stroke engine”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Zephyris, CC BY-SA 3.0, via Wikimedia Commons.