Partially true. The OEM PCV valve closes in boost, which leaves no route for excess pressure to evacuate out of the head other than the small breather on the front of the valve cover that normally connects to the intake arm. For this reason, a closed system is not recommended for boosted applications.

 

Just replace the PCV with a hollow elbow.

I run the two ports with piping routed to a catch can with a breather half way down the catch can to vent, obviously the intake tract port is capped off and the original pipe from the rear port to the intake manifold is capped off at the I.M end.

I use a brillo scouring pads inside to act as a 'cheap ass' baffle - but it works

 

Agreed. The OEM PCV was not intended to see pressure on the intake side.

 

This is what we're using on the J32 AP2



Evan

 

Internally baffled with provision for oil drain at the bottom. Custom built locally along with the rest of my new setup.

 

if you vent it, its no longer CARB legal

reasons why I use the SC intake as a souce

no boost means the stock PCV is pulling air in through the can and into the valve cover then into the intake manifold

under boost the suction from the intake draws air out of the VC and the PCV valve is closed

no matter if its in boost of under vac the oil mist is being pulled out of the motor, its not just being let out of the vent its being removed under vac

ideally I would remove the stock PCV and just throw in a little filter on one side of the VC and run a slash cut into the exhaust so it always pulls in fresh air and pulls out the fumes but again not carb legal

 

hmm interesting


I understand that the PCV is a Valve, so air will only move in one direction - that is out of the engine. I was under the understanding that that is what kept it from sucking in air at all...

ya, I was thinking that exhaust splice-in set up would be ideal, but expensive to get my mechanic to do (lot of custom work and exhaust fabrication)

 

Its not expensive at all summitracing.com type in exhaust slash cut they sell a full weld in kit your mechanic will just need to drill a 1/2" hole and run a 1.5" weld around it. If he charges you more then 50 to just install the slash cut and not hook up the lines get a new mechanic. You could even bring your test pipe in if you're running one and have it done right on it.

V8 guys have been running the slash cut setup for decades and it works flawlessly no need to make a simple system crazy complex if Carb isn't an issue.

 

Your set-up looks like it utilized the ebay catch can, I was thinking of getting one and poping it open and doing a DIY baffle like you did! So you are running the stock line from the VC to the intake manifold as well? (for driving in traffic, no boost)

 

spectacle, your setup is clever