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22/04/2025 4:47 pm
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I have a 1998 Mercury Grand Marquis GS. I am having a difficult time finding solid information on how exactly a PCV system with a catch can should be setup on a naturally aspirated V8 engine. My current PCV flow path is as follows; intake (before throttle body) ---> crank case ---> PCV valve ---> catch can ---> atmosphere.
Some people are saying that having both valve covers routed to the catch can and then to atmosphere is optimal, but this seems to negate the purpose of a PCV valve. From what I understand, having the PCV system connected the way it is done on my vehicle creates a vacuum and draws oil vapors out of the crank case better than just the blow-by alone.
To make a long question short, should the PCV system send vapor out both valve covers or draw air in one cover and out the other?
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22/04/2025 5:59 pm
You shouldn't need one. They're mostly for direct injection engines.
