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Wankel Engine.

The Wankel rotary engine is a fascinating beast that features a very clever rearrangement of the four elements of the Otto cycle. It was developed by Felix Wankel in the 1950s.

In the Wankel, a triangular rotor incorporating a central ring gear is driven around a fixed pinion within an oblong chamber.

The Wankel promised higher power output with fewer moving parts than the Otto cycle engine; however, technical difficulties interfered with widespread adoption. In spite of valiant efforts by Mazda, the four stroke engine remains much more popular.

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