Rotary engines (also known as Wankel engines and Wankel rotary engines) are quite different from piston or ‘reciprocating’ engines. One of the distinguishing features is that they don’t need valves to operate. That’s to say, the Wankel rotary engine design doesn’t have valves — but quite a few rotary engine designs have incorporated them. Both rotary engines and piston engines utilize internal combustion and share the same phases of intake, compression, power, and exhaust. But beyond this similarity, they are
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