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It's all about volumetric effeciency. I like to think of an engine as a lung. The more air/fuel mixture you can get in, and the more exhaust you can get out the better. Just factor in ignition to make the changeover as complete as possible. The more effecient the engine, the more power you are going to get for that particular displacement. You will never find a 100% effecient engine. You have friction loss to account for.
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