Wankel rotary crank engine concept of Mazda

Imagine that you’re a 1950’s car maker being pitched an experimental engine. This German guy named Felix walks into your office and tries to sell you on the idea of a three-pointed piston spinning around inside an oval box, burning fuel as it goes. It looks like a ball of fire in a bingo cage, or maybe a football knocking around in a washing machine. And not only does it run, but it’s also incredibly balanced.

The rotor itself is triangular with convex faces, and its three corners are called apexes. As the rotor spins within the casing, it creates three chambers that are responsible for the four phases of the power cycle: intake, compression, power, and exhaust. Each face of the rotor is always at work on one stage of the cycle. If it sounds efficient, that’s because it is—sort of. Horsepower outputs are high relative to engine displacement, but they consume lot of fuel because the combustion chamber is large. This engines Gaines up to 9000 rpm



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