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Thread: P C V placement
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Old 12-15-2009, 09:31 AM
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You do not want to combine a breather and a PCV in the same cap. They will, in effect, cancel each other out, and the nasties in your crankcase will not be sucked out. The PCV and breather need to be separate and on opposite sides or ends of the engine to get a cross-flow through the crankcase.

Here is one of the better explanations of positive crankcase ventilation I have come across.
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