Thread: Crank Case Ventilation fully explained. (Turbocharged edition.)

Why would it? You're already drawing from the valve cover under load. You want to draw from it some more? You can't. You're using the same size hose at the end of the day to draw things through to the intake.

Some mad turbo suction power, or a very small intake pipe :-P



I kind of wonder why they bothered with PCV system then if valve cover breather pretty much eliminates the need for it. Granted valve cover breather wont be as good at idle, but still.

A valve cover breather does not eliminate the need for the PCV system. Not even close.

electric vacuum pump?

You offering?

Ive thought about it.

From the N/A thread. Same principles apply to boosted setups.

Have you found any good electric kits?

No, I have not. Any I've seen are too loud for continuous use. I haven't been looking hard though.

The BMW S52 engine (and I'm sure others) comes with an air pump that might work well and be quite, I've not researched it enough though.

Tried it out today, the amount of vacuum coming from the turbo is definitely sadly low, probably 3inHg or so. One thing I realized, while at WOT driving this setup might be fine, but while cruising there would be extra blow-by causing drag. This is not possible to put into power numbers, but would probably be seen by slight loss of MPG.

One main thing that I do like about routing PCV to breather, is reduced amount of oil/oil vapors in the intake manifold. Granted without a catch can this oil will just build up in the intercooler, but with a catch can it reduces the need for having two separate catch cans.