Engines: Motive Power Types: Rotary spark-ignition engine & components
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Topic IntroductionHelp

Rotary engine power pulses

Each chamber has 1 power pulse. So each rotor revolution produces 3 power pulses, which is similar to the output from a single cylinder 2 - stroke engine.

What if 2 rotors are bolted together?

Then their output is similar to that of a twin-cylinder 2 - stroke engine.

Because of the ratio of the gears in the housings and rotor, the eccentric shaft makes 1 revolution for each power phase. That’s the same as 3 revolutions for each rotation of the rotor. So the eccentric shaft turns at 3 times the speed of the rotor.