kirban's pcv inline check valve

[grocerygetter]

will this keep oil from getting into the tb from the pcv? I put a new AC pcv valve in recently. Is there another vendor that has it less than $20?

 

[stickybones]

will this keep oil from getting into the tb from the pcv?

No.

 

[grocerygetter]

so that's normal? I'm not talking about a lot here...just a little.

 

[stickybones]

I would say it's normal for these cars (even though some will say their's doesn't suck oil from the PCV) but it's certainly not desireable. I myself use a catch can in the PCV line to filter out the oil.

AMW catch can Price has gotten a bit ridiculous. It was about half this price when I bought mine last year. Oh well.

BTW, if you do install a catch can device, you'll need that check valve you were talking about before between the catch can and the vacuum port on the throttle body to keep boost out of the can.

 

[2QUIK6]

Yep, the kirban valve only keeps boost from going thru the tube (reverse flow of air) will not filter out oil being sucked up the PVC during normal operation under vacuum....the catchcan will do that and works very well.

 

[TurboGN]

BTW, if you do install a catch can device, you'll need that check valve you were talking about before between the catch can and the vacuum port on the throttle body to keep boost out of the can.[/QUOTE]

Stickybones, I also have a catchcan and love it. I removed a checkvalve (ATR) because it wouldn't allow the PCV to ventilate the crankcase. Why does it hurt to let boost into the can? Thanks, Joel

 

[stickybones]

Why does it hurt to let boost into the can?

Maybe it won't. I just figured it would be best not to let boost into the can.

 

[2QUIK6]

On the boost going into the can...I think it would be a good idea to keep it out since boost pressure is a lot higher than the vac pressure going thru it, I would not want any pieces of the wire mesh in the catchcan filter to go backwards into the PVC or get into the crank case in the event the PVC does not stop boost from going into the crank case.

 

[VadersV6]

Just get a good condensation catch from SMC pneumatics. They're designed to hold up at pressures over 150psi. Thats what I used. Collects oil like a suminabitch too. If you run a good catchcan like the one I mentioned, you dont need any check valve. If you dont have a catchcan at all, you still dont need a check valve. The PCV does all the work.

 

[2QUIK6]

Yes, theoretically the PVC should keep boost from going into the crank case and the stock PVC is designed to do just that at stock boost levels. But a worn PVC and high boost levels..the $20 is great insurance.

 

[VadersV6]

Replace the PCV and you wont have that problem. Besides, the more boost you run, the harder the puck in the valve will seal. Basic physics.

 

[rob86gn]

I just bought that check valve device from Kirban, haven't tried it yet. I tried to apply vaccum by mouth and could barely get any air through it the way air is supposed to go.

I am also concerned that it will not allow the crankcase to ventilate. The selling point is it promises that you won't blow out the rear main seal. I don't know what is worse- boost in the crankcase or explosive, gasous blow-by?

 

[2QUIK6]

You can't apply near the vacuum by mouth the the motor pulls. When you hook up the check valve, just start the motor and you'll feel there should be plenty of vac going thru the valve. The PCV is meant to ventilate the crackcase of emissions gases that erode the ozone and pull those emissions into the cylinders to burn up, I wouldn't worry about them being "explosive" in the the crank case, every car before the 70's just about did not have one.
Doesn't take much oil and carbon buildup on the PCV to make the check ball not seal as its just a ball bearing seat seal unless you change it each time you change the oil.

 

[rob86gn]

No, I'm not all that worried about the explosiveness of the gases and I do understand the purpose of a PCV valve; that is why I am concerned about the fact that this "check valve" is pretty restricted.

I understand that I can only produce about 10 in. of vaccum by mouth but the thing is supposed to open at 4 in. and it doesn't. Is yours the same way or does it seem to open easier?

 

[TurboGN]

No, I'm not all that worried about the explosiveness of the gases and I do understand the purpose of a PCV valve; that is why I am concerned about the fact that this "check valve" is pretty restricted.

I understand that I can only produce about 10 in. of vaccum by mouth but the thing is supposed to open at 4 in. and it doesn't. Is yours the same way or does it seem to open easier?

Mine was the same way causing a loss of pcv-controlled vacuum leak and oil vapors to be seen coming out of the valve cover filter at idle. Removed the check valve, reset the tps, and all was well.

 

[2QUIK6]

I understand that I can only produce about 10 in. of vaccum by mouth but the thing is supposed to open at 4 in. and it doesn't. Is yours the same way or does it seem to open easier?

Not sure how restrictive mine is, I just installed it in line and them checked that vac was still being sucked thru on the hose where it connects to the PCV.
It may just be the "initial" vacuum needed to open the check valve is a little greater than 4 in. But I did notice my TTA had some smoke coming out of the valve cover breather during the low speed emissions testing so you may be on to something. I'll check it out further and let you know what I find.

 

[VadersV6]

Waste of money. This will only do you any good if the PCV valve is crap and failing, or you're not running one at all. If the check valve closes at 4 inches of vacuum, then your PCV system isnt working during any small load while cruising. Its very easy to reach zero vacuum when cruising. This is a time when you're pushing alot of blowby and you really need your PCV working. The check valve will insure that it's not.

 

[2QUIK6]

If your only pulling 4in at cruise, no movement of the pedal, then you have other problems. Stock cam on mine pulls a solid 10-15.

 

[VadersV6]

Well, if you get a load and start going up a hill, the vacuum can easily drop below that.

 

[thunderace31]

Just remove the damn PVC Valve you dont need it
I dont want all that crap in the cycl. to be burned makes less power!!!
Plus how many really fast cars due you see with one??? Can you say NONE!!!
Trust me here if you see smoke coming out of the V-covers its time for a rebuild anyway
Just my .02
Correct me if I am wrong here