PCV System

Super Bleeder!! · 08-09-2007

Quote:

Originally Posted by S2kracka

Take out the PCV valve, its not creating any crankcase vacuum with an open crankcase breather (nipple/vent on left side of the valve cover when you standing in front of the car facing the engine).

That crankcase breather port isnt suppossed to be open to atmosphere. From the factory that port is routed into the piping in front of the turbo which assures a constant vacuum.

Speedfreak · 08-09-2007

This thread topic is something I've been wondering about for a while. From the looks of it, the Krank vent seems like a good solution?

http://www.et-performance.com/turbo.html

I am not that read up on this subject, but know it's a problem with higher hp cars and for longevity. I want a solution!

**Kracka** · 08-09-2007

Quote:

Originally Posted by Speedfreak

From the looks of it, the Krank vent seems like a good solution?

They are hugely popular in the S2k-world for both N/A and FI cars.

Andrew7dg · 08-10-2007

Quote:

Originally Posted by Speedfreak

This thread topic is something I've been wondering about for a while. From the looks of it, the Krank vent seems like a good solution?

http://www.et-performance.com/turbo.html

I am not that read up on this subject, but know it's a problem with higher hp cars and for longevity. I want a solution!

I use something simmilar to this on my car. However I didn't pay this amount of money for that! I paid like $5.00 for a pack of 4 (they came in sets). Main reason is the ones I bought are plastic and these are metal. Mine hold 125psi so I am also good on "high boost applications". These just are pretty and shiny. however they are still to be used with the PVC valve. you just splice them inline.

You still need to just buy a PVC valve even with this kit. It serves a big function. I recomend putting a filter on the line as well.

The problem I am running into is that I am running a GM MAFT and when the PVC valve is open I am pulling in unmetered air into the manifold. I will have you guys think about that for a while.

however this is what I use:

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

PCV side : VC -> PCV -> optional 2nd catch can (sealed) -> heavy duty check valve (which is what that kit offers but don't pay that amount of money!) -> intake manifold.

I recomend the catch cans on older cars. It does save on cleaning a lot of oil. I build my own using PVC pipe and painting it black.

**Kracka** · 08-09-2007

Quote:

Originally Posted by Super Bleeder!!

That crankcase breather port isnt suppossed to be open to atmosphere. From the factory that port is routed into the piping in front of the turbo which assures a constant vacuum.

The problem is most DSM's are running around with them not hooked up to the intake, and also regular PCV valves leak boost through into the crankcase.

$110 for these things isn't exactly cheap, but at the same time they are serving a lot of functions. For the dip stick popping out its an actual solution, not just a patch like zip ties or springs to hold it in. I am glad I bought mine, I plan to get them for any car that I modify and consider to be my "good car".

**1ViciousGSX** · 08-10-2007

Quote:

Originally Posted by Super Bleeder!!

That crankcase breather port isnt suppossed to be open to atmosphere. From the factory that port is routed into the piping in front of the turbo which assures a constant vacuum.

The main reason why it's routed back into the intake pipe is so the air going into the valve cover is filtered. Ther is no real vacuum on the inlet side of the turbo unless you are running a clogged air filter. 2nd reason is that if you have a worn out engine with excessive blow by, it will go into the intake system to get burned by the engine. But that can cause build up in the turbo, piping and the FMIC. The Magnus SMIM should have 4 ports on it, I'm sure one of them can be used for the PCV.

Get a vacuum block or t-fitting if you need more.

I run the Jaz mini catch can/breather and it works fine with the stock PCV.
http://www.jegs.com/webapp/wcs/store...10002_69732_-1

Andrew7dg · 08-10-2007

Quote:

Originally Posted by 1ViciousGSX

The main reason why it's routed back into the intake pipe is so the air going into the valve cover is filtered. Ther is no real vacuum on the inlet side of the turbo unless you are running a clogged air filter. 2nd reason is that if you have a worn out engine with excessive blow by, it will go into the intake system to get burned by the engine. But that can cause build up in the turbo, piping and the FMIC. The Magnus SMIM should have 4 ports on it, I'm sure one of them can be used for the PCV.

Get a vacuum block or t-fitting if you need more.

I run the Jaz mini catch can/breather and it works fine with the stock PCV.
http://www.jegs.com/webapp/wcs/store...10002_69732_-1

Not picking on you but the vent on the side sees lots of vacuum when the turbo is spooling. Thats when the engine needs vacuum under boost. When it is at idle (off boost) for example, is when it doesn't see much vacuum however that when the PVC valve works and is sucking air out.

The other reason that it is routed into the intake line is because it needs metered air.

So the people that have vents on the side of their valve cover are also pulling in unmetered air through the PVC system. Kind of like what I am dealing with using a GM MAFT

**1ViciousGSX** · 08-10-2007

Quote:

Originally Posted by Andrew7dg

Not picking on you but the vent on the side sees lots of vacuum when the turbo is spooling. Thats when the engine needs vacuum under boost. When it is at idle (off boost) for example, is when it doesn't see much vacuum however that when the PVC valve works and is sucking air out.

The other reason that it is routed into the intake line is because it needs metered air.

So the people that have vents on the side of their valve cover are also pulling in unmetered air through the PVC system. Kind of like what I am dealing with using a GM MAFT

Not picking on you either, but the last thing I want on on my turbo inlet is vacuum. It doesn't really matter because once you go WOT there is no vacuum at the PCV.

Andrew7dg · 08-10-2007

Quote:

Originally Posted by 1ViciousGSX

Not picking on you either, but the last thing I want on on my turbo inlet is vacuum. It doesn't really matter because once you go WOT there is not vacuum at the PCV.

so, if you don't mind me asking, what do you have on the side of the valve cover. is that were you have your catch can? is it venting off to the atmosphere or is it sealed?

**1ViciousGSX** · 08-10-2007

Quote:

Originally Posted by Andrew7dg

so, if you don't mind me asking, what do you have on the side of the valve cover. is that were you have your catch can? is it venting off to the atmosphere or is it sealed?

Catch can breather venting to the atmosphere.

Andrew7dg · 08-10-2007

Quote:

Originally Posted by 1ViciousGSX

Catch can breather venting to the atmosphere.

A setup like your only take care of half of "crankcase ventilation", it will be enough to relief pressure in most cases but it will do nothing to ventilate crankcase due to lack of vacuum in the system, ventilation as in removing blow by and contaminates which will settle into your oil if not pulled out.

blageo23 · 08-10-2007

Quote:

Originally Posted by 1ViciousGSX

Not picking on you either, but the last thing I want on on my turbo inlet is vacuum. It doesn't really matter because once you go WOT there is no vacuum at the PCV.

When at WOT the PCV system goes in reverse because of the boost. Thats why you get oil in the intake because the blowby goes through the breather side and into the intake.

**1ViciousGSX** · 08-10-2007

Quote:

Originally Posted by blageo23

When at WOT the PCV system goes in reverse because of the boost. Thats why you get oil in the intake because the blowby goes through the breather side and into the intake.

That's why I have a catchcan/breather, so that doesn't happen.

The system doesn't go in reverse, the PCV valve closes off the flow under boost, what comes out of the breather is blowby.