A four-stroke cylinder produces a power stroke only every other rotation of the crankshaft, with three strokes being pumping losses. This doubles the real surface-to-volume ratio for the four-stroke reciprocating piston engine and the displacement increased. The Wankel, therefore, has higher volumetric efficiency and lower pumping losses through the absence of choking valves. Because of the quasi-overlap of the power strokes, that cause the smoothness of the engine and the avoidance of the four-stroke cycle in a reciprocating engine, the Wankel engine is very quick to react to power increases, giving a quick delivery of power when the demand arises, especially at higher rpm's. This difference is more pronounced when compared to four-cylinder reciprocating engines and less pronounced when compared to higher cylinder counts.