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In automotive applications, it is better to use fewer, larger cylinders than racing tradition encourages. The peak RPM is reduced, but at cruising power that is irrelevant, and there is a greater volume to surface ratio in the cylinders, and hence a smaller percentage of the charge has its flame quenched by the metal.
The diesels that get 50% efficiency in ships have cylinders bigger than some rooms, and run at 110 rpm.
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There is no excuse for a land vehicle to weigh more than its average payload.
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