Question

High rpm engine piston diameter to stroke ratio

Answer 1

While there are many factors that contribute to an engine’s efficiency, the primary factor that needs to be considered is the engine geometry itself.

Not only does the overall size of the engine matter, but the aspect ratio of the engine cylinders—defined by the stroke-to-bore ratio—also matters.

To explain why, one must consider three factors: in-cylinder heat transfer, cylinder scavenging and friction...

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