ya it looks like they would replace the oem pcv check valve. Are you running over 30psi of boost on your setup? If not then the oem should be fine, if it isnt just replace it with a new oem one.

 

U buy the adapters locally

 

http://www.dsmtuners.com/forums/arti...cv-system.html

 

Perfect! Great read. I feel like I have found a great inexpensive solution. Thanks a bunch for that link.

 

I don't think that the check valve should be used to replace the oem pcv valve. The air flow through the check valve is significantly greater than through the pcv valve. If the car is run with the check valve only, the additional air flow will raise the idle to an unacceptable level. On mine, it was about 2000 rpm! With the pcv / check valve combination everything was normal.

I don't run 30 psi boost either, but after two new oem pcv valves which wouldn't hold past 15 psi (one crapped out at 10 psi) I opted for the check valve. Probably overkill, but it isn't going to leak no matter where I set the boost.

 

I know this thread is years old but I need to bump it. I am getting 30psi on my boost leak check but still getting air out of my breather. I know It's not my pcv valve cause I took the hose off that goes to it and plugged it. It's a descent amount of air out of my breather. I call bs on the tdc cuZ I never had to did that before. I have 272 kelfords with spring and retainers. Has anyone figured this out? I'm starting to thing this is normal. I don't get any blue smoke ever. My dipstick never has blown out. I know my compression is Good. Car also only has 38k on it. And not beaten.
The amount of air would prolly not be enuf pressure to blow up a balloon but damn it still feels odd to me. Any help would be great.

 

I still get air out of the valve cover breather barb as well....

I have GSC S2's with beehive springs and stock retainers. About 2 years ago i was burning a lot of oil and the car seemed to have a bit of a boost leak. I could visually see that my valve stem seals were demolished and I replaced them with the low clearance ones from super tech. This stopped the burning of oil and lowered the amount of air coming out of the breather barb. However i still get air coming out. I would say enough to blow up a balloon is fairly accurate.

I say normal?

 

Every time I hear someone say normal it makes me feel better but I till have that skeptical side of me that wonders. I didn't have this issue before I had my cams etc... I actually meant not enuf to blow up a balloon but close. If it comes to me actually getting a balloon to check I'm just gonna go insane. Lol. The fact I'm not burning oil and able able to pressurized it to 30 psittacosis. Tell me my rings and seals are fine and I don't have boost leaks. I can't hear any leaks and get normal pressure drop. It takes almost 2 minutes to lose 30psi

 

But I have time say a boost leak isnt my concern. I just am wondering if air out of breather is normal. The more i pressurize it the worse it gets. BTW I just had a brand new fp red installed. Like three days ago. With cams,retainers and springs, I would've been told if my valve seals were bad. Plus my car has been babied to It's 38k miles on it now.

 

Anyone else have this problem or better yet figure out if and why It's normal?

 

I've noticed the same thing almost every time I've checked for boost leaks. My opinion is that the air exiting the breather tube on the valve cover is most likely caused by either leakage past the piston rings on one or more cylinders, which results in increased crankcase pressure; or slight leaks past the stem seal on an open valve. This shouldn't be any cause for concern. Remember, you're checking for boost leaks, not doing a leak-down test on each cylinder. During a leak-down test, all valves are completely closed on the cylinder being tested. That will never be the case during a boost leak test (unless you remove all of the lifters on all four cylinders) . Naturally, the more pressure you pump into your system, the more pressure is going to escape through the breather.

My engine has brand new valve stem seals, retainers, etc and has 180 psi compression on all cylinders. It does not burn oil. Yet there's still a slight sound of air escaping through the breather tube during a boost leak test. I don't worry about it. I just listen and look for leaks in the turbo system, including the injector seals, throttle-shaft seals, and the pcv valve to intake connection.

 

^^^Thank you. I geuss the reason for my concern was before I had my turbo,kelford cams, retainers, valve springs installed I really don't think it did this at all. So my hope is that due to the highest duration of lift in the valves It's doing this. But that doesn't really make sense cause air would just be escaping through the exhaust or the intake. Maybe there's a way it can get from either one of those Into the valve cover???? Idk.
In the end I'm just gonna sweep my worrying about it under the rug. And hope when my tuner comes up this Sunday I don't have problems. Ohhhh the joys of Modding. Idk how my gf puts up with it all. Lol
If anyone else would like to chime in feel free.

 

I'm able to pump my boosted side of things up to 30psi and watch it slowly fall. About 2-3seconds per psi. And can't hear anything. I've yet to soap bubble but will sometime this week.

 

You're right. An open exhaust valve will just loose pressure through the exhaust pipe, etc. Not through the breather tube. The only way (normally) to get pressure into the valve cover during a boost leak test is from the crankcase, or the pcv valve. (I'm ignoring obvious problems like a loose spark plug, a bent valve, horribly worn valve guides, and so on because I'm certain that's not the issue here). Ideally, the pcv valve should prevent this, but the oem pcv valve is not so reliable. That's why I use a check valve between it and the intake manifold.

I usually cap off the breather tube only because the noise may prevent me from hearing a "real" boost leak elsewhere. I always release the pressure as soon as I can because I don't like holding 30 psi in the crankcase, valve cover, etc any longer than necessary. There's too many seals and gaskets not designed for that kind of pressure.

 

^^^Exactly. My car has 38k on it and just had head work and I highly doubt It's any of the above. But Ya I didn't want to put that much psi in my valve cover for the reasons u posted. Just something I'll have to live with. Thanxx man.