PCV on a boosted engine???

[Blown353]

Victor Jr intake, valve covers have none of the factory ports, throttle body port gone, etc. I was thinking running 2 -10 lines from the valve covers to a catch can then to the inlet of the turbo.

That setup as described will catch all oil vapors emitted from the engine and suck them back in and reburn them... but it will not provide constant fresh air circulation through the crankcase to help keep the oil clean and actively suck out combustion blowby and contaminants.

To properly ventilate the crankcase and keep the oil clean requires that fresh air be constantly circulated through the engine... that's what a PCV is for.

Also, a good PCV will seal on it's own under boost-- but as Mike mentioned it isn't a bad idea to add a check-valve in line for additional reverse-flow protection.



Also like Mike said, adding an in-line air/oil separator (like his good catch can, AMW also makes a good one) is an excellent idea. Oil in the intake charge helps promote detonation.

I have my blower engine set up with large filtered breathers on baffled stands in each valve cover, and a PCV in the intake valley that is baffled. The PCV runs through an AMW catch can prior to going up to the plenum, it does a great job separating the oil vapors and the intake plenum is extremely clean even after several thousand miles. The PCV is sourced off a Buick Grand National, easy to retrofit because it has hose barbs on each end and as the OEM application involved boost it seals very well. You can't blow back through it either with your mouth or with an air compressor.

[Mike Norris]

"Victor Jr intake, valve covers have none of the factory ports, throttle body port gone, etc. I was thinking running 2 -10 lines from the valve covers to a catch can then to the inlet of the turbo. Fresh air from a vent on the valve cover with a one way valve??"

The setup you are describing is more of a breather package then a PCv system. In this case you would not want it going back to the intake tract as it would most likely allow oil to get there anyhow. I have attached a picture of a billet 3" can we have used for that in the past.

If you do not have a baffled source for the PCV system such as the stock valve covers use, you could use the LS6 style valley cover from a 2004 Vette as Blown353 has. This works very well to say the least. If the area for the PCV source is not baffled initially it will tend to get a lot of oil into the hose.

The GN piece is another option for sure, but I have not used one. I try to stay with all LSx pieces and a catch can on these engines as it is just my preference.

Hope this helps.

Mike Norris