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1)Blow-by occurs when [the explosion] in your engine's combustion chamber causes fuel, air and moisture to be forced past the rings into the crankcase. Your engine's rings must maintain an [excellent] fit in order to contain the pressure. 2) Blow-by also occurs when somebody who REALLY needs to [take a dump] lets loose a fart so putrid and heinous, that it smells as if he just crapped his pants.
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