does anyone know of some really nice electric vacuum pumps, im going to go that route for a nice clean set-up

 

https://ls1tech.com/forums/showthread.php?t=850263

 

What's wrong with the idea in the above link's thread is that the PCV valve is designed to be closed under high engine vacuum, and if there is positive pressure in the crankcase, that pressure needs to escape. The stock escape point is the passenger-side breather, which goes to the throttle body. Under normal circumstances, it breathes air filtered by the engine's air filter into the crankcase. If pressure is present, it will escape, and gets sucked into the engine through the throttle. Also, in that link, the tee and check valve feeding the intake manifold is redundant. Having it at all is giving the turbo a chance to pressurize the crankcase if the check valve fails. The stock PCV system cannot pressurize the crankcase, if it enters on the vacuum side of the blower/turbo. I wanted a vacuum pump too, but I know it is unnecessary now.

 

there's no pressurizing of the crankcase with that setup. look at it again.

 

I ultimately decided to stick with how Magnuson set their system up with the addition of a catch can (kiss)

 

they just pulled off of the inlet side of the blower? with a roots style supercharger thats fine, but the inlet side of a turbo doesnt pull much vacuum at idle. Which is the reason I went with hydroboost instead of jacking with the vacuum booster on my blazer (another thread i know).

the question is, how important is it to have stout vacuum in the crankcase at idle speeds and just off idle? I think it is for various reasons but I would like to hear some other thoughts on it. I WILL test it both ways when I throw the engine on a dyno, out of curiosity more than anything.

 

The check by the turbo would have to get stuck shut, the one by the manifold stuck open, and the PCV valve stuck open. You're right, it couldn't happen. Except it would happen to me, and only intermittently so it could never be diagnosed. Again, only me.

 

Let me clarify, the pcv I left intact, and just pulled the breather hose off the throttle body(capped that port) and installed a breather on the hose. So I was getting crack case evacution from the stock pcv pulling air through the breather.
At wot never had oil mist anywhere.

 

That is purdy.. How often do you have to drain oil from one of those.?

 

cant say i havent been there