Secondary compression meaning

Secondary compression definition

A term that is used in two-stroke engines. Primary compression takes place in the crankcase and is then pushed up into the combustion chamber where secondary compression takes place as the piston squeezes the mixture. If the crankcase seals are poor, primary compression will be reduced resulting in reduced secondary compression so that it may be difficult to start the engine.

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Automotive terms beginning with "S", page 11

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