![]() Simple geometric relationships show that an engine cylinder with longer stroke-to-bore ratio will have a smaller surface area exposed to the combustion chamber gasses compared to a cylinder with shorter stroke-to-bore ratio. To explain why, one must consider three factors: in-cylinder heat transfer, cylinder scavenging and friction. ![]() 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. 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.
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