Wankel engine
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Wankel engine is a type of internal combustion engine with a rotary mechanism instead of pistons. It produces high torque but has low fuel efficiency, caused by difficulties sealing the rotor-cylinder interface. A small number of auto manufacturers have included the Wankel engine in their vehicles, and while pioneered by Jensen and Audi, it is now only available in one model of Mazda, the RX-8.
It is named after Felix Wankel, who worked on this design in the 1950s.