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 maufacturers have included Wankel engines in their vehicles, and while pioneered by Jensen and Audi, is now only an option in one model of Mazda, the RX-8