how much vacuum in a properly working PCV?

born2drv

born2drv

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can someone tell me how many inches of vacuum a properly functioning PVC setup requires? is there a maximum limit to how much you'd want to run? does the vacuum level vary whether the car is in boost or not?

the reason i'm asking is because i'm thinking to use an electric crankcase evacuation pump and i was doing some searching and some super-charged/turbo-charged mustang guys are using this pump for their PCV system:

GM part # 22062562
bracket part # 25534015

it's for a cadillac or something and was specifically designed for PCV applications, and it's only $150 or so from a dealer so i thought it would be worth a try? it generates 8" of vacuum. is this enough for the crankcase on our cars?

the alternatives are either:

- run a stock PCV setup and get oil in the intake
- run a catch can which still will cause ^^^ on some level plus require an assload of hose.
- run a belt-driven pump which would be a pain in the ass to get installed

so what do you guys think? anyone know how much vacuum our cars need???? thanks.
 
born2drv

born2drv

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lintlars said:
I was also wondering about this a pump driven setup would add too much clutter to an already full engine bay what about this http://www.moroso.com/catalog/categorydisplay.asp?catcode=13023
Click to expand...

how would that work? you weld the nipples into your exhaust manifold and run the PCV there? i could see the check valves helping, but how would this create vacuum?

i don't think a pump would add too much clutter, it would be like having a catch can, except you wouldn't run it to your intake, you'd run it to exhaust therefor your lines could be shorter and things would probably look less cluttered compared to having a catch can
 
born2drv

born2drv

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thanks a lot man, those are very helpful links. seems that 7" of vacuum would be great out of an electric pump, the mustang people seem very happy with it so i think i'm going to give it a shot.

basically i'm going to run lines from the valve covers to the GM cadillac vacuum pump, then to a check valve, and finally to the exhaust.
 
I

IJ.

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I come from a land down under
Going from memory here the Exhaust/Pcv system won't work with an exhaust with mufflers as there's too much back pressure so you don't get enough flow for it to be effective.

I guess adding a pump could overcome this!
(Got a pic of the pump?)
 
born2drv

born2drv

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Hey IJ, I did some more searching around, and I found this one is what most "street tuners" are using:

ssb-28146.jpg

http://store.summitracing.com/partd...SB-28146&N=700+400336+310100+115&autoview=sku

For drag racing applications, they recommend using a belt driven one.

That one there is adjustable from 0-20" Hg and the summit people say it's used all the time for PCV so i think that's what i'm going to go with. They also said you can run a catch can or inline filter as well to keep the oil level down so you don't damage the cat, mufflers etc if running to exhaust or minimize film in the intake if running it there.

or if you want to keep your intake clean and emissions low you can get one of these things:
http://www.maesco.com/products/racor/r_ccv_intro/r_ccv_intro.html
it's an inline oil filter that allows vacuum to build, with a replacable filter element.

so it would be like this cam covers > catch can or pcv oil filter > vacuum pump > exhaust or intake.
 
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