Crankcase blow-by is hot gases that sneak past the piston rings. As of 2007, the U.S. Environmental Protection Agency limits nonmethane hydrocarbons to 0.14 grams per bhp-hr. Blow-by gases are rich in ...
Some of us will remember (or still have) engines with PCV valves. The PCV system basically took blow-by gas and oil vapors from the combustion chamber and funneled them back into the intake system, ...
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