Quote:
Originally Posted by Phx Mike
I don't think there is any downside to a PCV system but emissions aside there is no harm in not having it either.
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The only possible downside is the potential for
oil consumption in a poorly designed PCV layout, like Brent mentioned above, which usually arises when a PCV valve is plugged into a non-baffled valve cover.
I totally agree with Brent that venting directly to atmosphere (typically out of both valve covers) is the easiest solution for engine longevity and design simplicity.
That is the answer to the OP's question- No, you don't "need" PCV- but you
do need a way for crankcase vapors, and the pressure they generate, to vent out...