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 Wankel engines in their vehicles, and while pioneered by Jensen and Audi, 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.