Reply to "Valve cover breathers / PCV advice"

panteradougMember

As Dave said, you do not need to connect the breather to the air cleaner base. It can be vented to the atmosphere.

Manufacturers just connect them to the air cleaner base to use the air filter as a filter for the crankcase venting also. It is simpler and complies with EPA with no arguments.

So that is the simplest solution for emissions but all you need to have really is a oil fill cap that is vented to the atmosphere and has some type of a foam filter inside it to keep dust and debris from entering the valve cover.

That plumbing would work fine and if your PCV valve does not completely close at idle, most don't, then it is legal because you have a negative flow (suction into the engine) at both idle and when the throttle is open at any amount.

2/8/159:40 AM

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