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Old 07-12-2008, 10:55 AM   #26 (permalink)
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No, it's roughly 1/3 lost to engine heat and 1/3 out the exhaust.

Agreed - heat loss is the problem with low piston speeds. In general, you want high piston speeds, quick burn rate, high cylinder temps and pressures, long stroke, high compression, and insulating materials or coatings inside the combustion chamber (aluminum is not your friend).

Of course you also want the engine to stay in one piece.
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