Thread: PCV System
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Old 08-10-2007   #4
Andrew7dg
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Join Date: Mar 2006
Location: St. Paul
Drives: Currently Mitsu-less
Posts: 851
Re: PCV System

wow leave for lunch and a bunch of stuff is said....

ok...

I would like to state I don't have any crap in my compressor wheel or intake tube because of my setup. It is pretty much the origional setup but with filters and a heavy duty check valve.

Look at my set up for just a second...

Breather side : VC -> catch can (sealed) -> intake pipe.

intake goes before the turbo just to clarify so it never sees boost

Catch can catches everything that the VC spits out which is kind of a lot of crud. After it is filtered it goes into the turbo. No crap.

Now why don't I just vent to the atmosphere like everyone else...

Because I believe that under high boost/ WOT when the PVC valve is closed there is a lot of blow by. This Breather side takes pressure out because the turbo take in so much air that it creates a vacuum (again before turbo) By having some sort of vacuum on it will take away pressure PLUS suck out unwanted gas. If you have it vented to the atmosphere there is a weird gas smell which I don't like. If this is hooked up to the turbo inlet tube. It does reburn it but it doesn't have the oil to go with it because the catch can caught it.

Make it short

No boost---> air going into valve cover side
Boost ---> air going out of valve cover side

If you have it vented to the atmosphere air goes in (no boost). However when you are running boost, there is pressure in the crank case and it need to go somewhere and by pressure it forces itself out of the breather side and you get weird smelling fumes

The other side

PCV side : VC -> PCV -> optional 2nd catch can (sealed) -> heavy duty check valve -> intake manifold.


I don't get that much crap in this filter but it still works.

I have a heavy duty check valve (good up to 125psi) that helps the pvc valve out. What people are experincing with just using the PVC valve is that the PVC valve won't hold high pressure boost and get pressure going the wrong direction.
Some people have installed the check valve without the catch can and still get good results. Since mine is a street driver I want to be safe and install another filtration system so my intake manifold and heavy duty check valve doesn't plug

Air only goes one way out of this system and that is into the intake manifold.

I have 3 more check valve selling for $2.00. easy for high boost applications.

Now why don't I just remove the PVC valve then? The PVC valve is calibrated for flow ratings. Thats why there is a spring and cost about $110 instead of my easy $2.00 part


This is how I have my system set up. It works for me just fine. I don't get any gas smells plus my turbo, intake, and intercooler is clean. I can also run high boost on my PVC valve with out it failing on me.


Now going onto this expensive $110 kit. I think it is shiny, crome and does everything that the $2.00 part does on the PVC side. However it also puts a check valve on the Breather side. What would this do though... When there is positive crank case (boost) it would let gasses leave, (off boost PVC valve open) it would block air going into the engine. There would be a vacuum at the pvc valve and no air going into the breathing side so what happens, the system has high vacuum and thats why you get the air wooshing in when you pull the dip stick.

http://dsm.dejonpowerhouse.com/
Has the product and look how it is set up.
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Last edited by Andrew7dg; 08-10-2007 at 01:58 PM..
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