Forced Induction Supercharger/Turbocharger

PCV/breather/oil seperator?

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Old May 27, 2012 | 03:20 PM
  #31  
dizwiz24's Avatar
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Re: PCV/breather/oil seperator?

Originally Posted by mzgp5x
Before the crank driven Vac pump mod, I always got oil in the stock LT1 manifold. Ended up changing the LT1 manf for a World single plane.

With the crank driven vac_pump mod, I am pulling about -5psi vac (1/3 atm). Quite a difference in performance due to added ring pack sealing. The pressure differential really helped seal the compression rings. Result... more cylinder pressure. I was quite shocked with the added performance the first test drive. I think the car works better with it.

I asked GZMS about driving his vac pump with an electric motor. He said it would take about 1 HP. Electric draw would put me over the charge system limit. So, I went with crank drive.
B.
I thought electric pumps (blowers, etc. ) were a joke and not capable of producing enough boost.

Though I know you are talking about an electric vac pu,p which has a difft purpose than a blower.
Old May 28, 2012 | 12:01 AM
  #32  
97WS6SCharged's Avatar
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From: Jacksonville
Re: PCV/breather/oil seperator?

Originally Posted by dizwiz24
I thought electric pumps (blowers, etc. ) were a joke and not capable of producing enough boost.

Though I know you are talking about an electric vac pu,p which has a difft purpose than a blower.
Electric pumps create vacuum better than electric fans compress air.
Old Jun 7, 2012 | 08:10 PM
  #33  
MysticBowtie's Avatar
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From: Dallas, TX
Re: PCV/breather/oil seperator?

On a dual can setup, where would a vacuum pump be connected? I'm guessing I would want it in the dirty side in the following order:

PCV ---- catch can----vacuum pump----front of intake manifold

Is that right? Trying to understand all of this.... Thanks for the help guys!
Old Jun 8, 2012 | 01:14 AM
  #34  
97WS6SCharged's Avatar
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From: Jacksonville
Re: PCV/breather/oil seperator?

With a pump you should be able to eliminate the PCV valve all together and just use a single catch can. You also don't need to route the line back to the intake unless you need a closed system.
Old Jun 25, 2012 | 12:16 PM
  #35  
slowZ's Avatar
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Re: PCV/breather/oil seperator?

Originally Posted by RealQuick
Chris, to your point, the turbo will draw from the air filter into the compressor, therfore it will always pull vacuum (whether the TB is closed or WOT).

If he pulls from anywhere after the compressor housing, he could certainly see positive crankcase pressure and blow oil out of his seals (unless he has a one way check valve to prevent that)
I'm not entirely sure that the fist statement is true. I think it is dependant on the size of the air filter on the turbo and compressor size (ultimately the volume of air that's able to be moved through the filter). If the air filter has too much surface area I do not believe it will start pulling a vacuum until the turbo is at or close to peak rpm's, if at all.
I tested this on my car, it has a rear mount tc-76. I have a 3/8 i.d. hose hooked up to the intake side of the turbo and I put a vacuum gauge on the end of the line and it sees no vacuum until very high rpm's and even then its so minuscule there's no way that it will evacuate any pressure from the crankcase.
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