Wankel engine
In a Wankel engine, the fuel-air mixture cannot be pre-stored because there are consecutive intake cycles. The engine has a 50% longer stroke duration than a reciprocating piston engine. The four Otto cycles last 1080° for a Wankel engine (three revolutions of the output shaft) versus 720° for a four-stroke reciprocating engine, but the four strokes are still the same proportion of the total.