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should have explained - heat is lost to surface area, power is made by PSI pushing on the piston times the length it effectively moves (stroke, sort of).
so, there is a square/cube thing going on - for a given CC, the fewer pistons you have, the less surface area you have for heat to be lost to.
air gets in and out of the combustion area through valves, which are effectively limited by the circumference of the valves, times the number of valves, with bonus for more lift and longer lift. too long of lift, and you lose economy.
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