PCV issues
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On The Tree
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PCV issues Hey Guys I got some PCV problems that I thought you guys might help me out with.
I unhooked the PCV tubing from my Procharger inlet hat cause it was getting oil all through out the supercharger. So now I placed a filter on the end of that hose and am just venting to the atmosphere.
There is a problem with the drivers side vent. I'm getting oil sprayed all over the firewall right behind that vent. I suspect the breather tube has ruptured. back there. Any ideas why?
I'm noticing some leakage out of the filter I installed so the passenger side valve cover seems to be working properly. Why is the driver's side giving me problems?
No granted I had to remove the tube leading from the passenger side valve to the throttle body so I could run the new tube. I only mention this because I think the stock PCV valve was located in that tube, so essentially I'm no longer using the PCV valve. Is there a second PCV valve in the tube leading from the drivers side vent to the passenger side rear vent? If there is then I'm thinking that PCV valve might be causing more pressure on the drivers side vlave cover than the passenger side one. Maybe that's why the drivers side vent is spraying oil? I'm shooting in the dark here, I don't even know if there is a second PCV valve back there.
Regardless I have a catch can on the way which I want to install soon. But I'm curious as to how I should route it to give both vlave covers the best ventilation.
Also is there a better PCV vlave that I can buy to help out?
Thanks for your help guys,
BH
I unhooked the PCV tubing from my Procharger inlet hat cause it was getting oil all through out the supercharger. So now I placed a filter on the end of that hose and am just venting to the atmosphere.
There is a problem with the drivers side vent. I'm getting oil sprayed all over the firewall right behind that vent. I suspect the breather tube has ruptured. back there. Any ideas why?
I'm noticing some leakage out of the filter I installed so the passenger side valve cover seems to be working properly. Why is the driver's side giving me problems?
No granted I had to remove the tube leading from the passenger side valve to the throttle body so I could run the new tube. I only mention this because I think the stock PCV valve was located in that tube, so essentially I'm no longer using the PCV valve. Is there a second PCV valve in the tube leading from the drivers side vent to the passenger side rear vent? If there is then I'm thinking that PCV valve might be causing more pressure on the drivers side vlave cover than the passenger side one. Maybe that's why the drivers side vent is spraying oil? I'm shooting in the dark here, I don't even know if there is a second PCV valve back there.
Regardless I have a catch can on the way which I want to install soon. But I'm curious as to how I should route it to give both vlave covers the best ventilation.
Also is there a better PCV vlave that I can buy to help out?
Thanks for your help guys,
BH
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Re: PCV issues If you have no pcv filter and still have it connected to the intake manifold, then you are blowing boost into the crankcase, which would be a no-no and probably why there is oil spraying around. I wish I had the picture available to show the pcv system, but basically the tube from the back drivers side comes over the the passenger side and meets in a Y with the back tube from the passenger side valvecover. After they become one tube, it goes to the pcv valve then to the side of the intake manifold. The tube on the front of the passenger side valvecover is where air is supposed to be going in the crankcase, and the other tubes are exits. The pcv alve is one-way so only air can go from the engine to the valve to te intake manifold. If you have bypassed the valve, then it will blow air into the back of the engine, not what it was designed to do.
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On The Tree
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From: Stalking the streets of Maryland
Re: PCV issues ahhh, that is most definitely what I have done. So why did ATI suggest I do it like that? If the front passenger side vent is supposed to be an "air in" vent, then shouldn't I have left it hooked up to the throttle body? The throttle body would see boost therefore forcing air into the passenger side valve cover. But ATI wanted me to hook that vent up to the inlet hat which is always going to see a vacuum. Why would ATI do this?
Why is the "air in" vent only on the passenger side?
So confussed about this PCV setup.
Mike
Why is the "air in" vent only on the passenger side?
So confussed about this PCV setup.
Mike
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From: Richmond, VA Where fast cars, well......are hard to come by.
Re: PCV issues If it were in the stock tb location, it'd see boost all the time since it's in front of the blade (it pretty much always has a little pressure in the intake tubing at part throttle). By moving to the inlet hat, it sees no boost, and the vacuum from the sc is only there at high rpm. At low rpm the intake vacuum pulls air through that tube. At high rpm where the sc would make the most vacuum, the intake manifold is under boost, so the pcv valve is shut, and if that's shut then there is nowhere for the sc to suck air(or oil) out the tube. You said you were getting oil in the blower right? Probably from putting boost into the crankcase, which blew it into the inlet hat.
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From: Germantown, MD
Re: PCV issues Yes the instructions say to remove the tube that connects the passenger side vent to the throttle body vent. it then tells you to attach the ATI supplied PCV hose and connect that from the passenger side vent to the S/C inlet hat. I did that and it sucked oil through. I believe the reason was that there is a PCV valve in the stock tube going from the passenger vent to the throttle body. So if that tube is gone, so is the PCV valve inside. So since the vent is now under constant vacuum it must be sucking oil through.
All I did was remove it from the S/C inlet hat and placed a small filter on it and allowed it to drain under the engine bay. If this front side passenger vent is the air inlet, then wouldn't my setup be better? The way I have it, it never sees vacuum.
Am I to assume that the other tube running along the passenger side that goes into the intake manifold(just below and behind the throttle body) is the PCV outlet for the rear passenger and driver vents? If so, then wouldn't it be a better idea to hook this tube up to the vacuum in the s/c inlet hat or at least vent it to the atmosphere so it doesn't see boost?
Should all three be vented to the atmosphere? Keping in mind I have a catch can comming, what is the idea way to relieve crankcase pressure?
Mike
All I did was remove it from the S/C inlet hat and placed a small filter on it and allowed it to drain under the engine bay. If this front side passenger vent is the air inlet, then wouldn't my setup be better? The way I have it, it never sees vacuum.
Am I to assume that the other tube running along the passenger side that goes into the intake manifold(just below and behind the throttle body) is the PCV outlet for the rear passenger and driver vents? If so, then wouldn't it be a better idea to hook this tube up to the vacuum in the s/c inlet hat or at least vent it to the atmosphere so it doesn't see boost?
Should all three be vented to the atmosphere? Keping in mind I have a catch can comming, what is the idea way to relieve crankcase pressure?
Mike
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Re: PCV issues
it then tells you to attach the ATI supplied PCV hose and connect that from the passenger side vent to the S/C inlet hat. I did that and it sucked oil through.
I believe the reason was that there is a PCV valve in the stock tube going from the passenger vent to the throttle body. So if that tube is gone, so is the PCV valve inside.
Am I to assume that the other tube running along the passenger side that goes into the intake manifold(just below and behind the throttle body) is the PCV outlet for the rear passenger and driver vents?
If so, then wouldn't it be a better idea to hook this tube up to the vacuum in the s/c inlet hat or at least vent it to the atmosphere so it doesn't see boost?
Should all three be vented to the atmosphere? Keping in mind I have a catch can comming, what is the idea way to relieve crankcase pressure?
Mike
Mike
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Staging Lane
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From: Norfolk VA
Re: PCV issues 
What about running the LS6 setup? Then running the line down to the blower hat? Run a filter inline with it to catch any oil.Also using a McMaster-Carr check valve with the PCV works well too, that was my old setup and seemed to cutdown on problem. I am waiting on something before I can check out the LS6 setup
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Verdad Gallardo TECH Fanatic
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From: Germantown, MD
Re: PCV issues AG,
When you say LS6 setup are you referring to the intake manifold? If so, I thought that only replaced coolant tubes, not PCV tubes? Not sure what you are taling about.
Obviously I am open to suggestion at this point. Could you explain what the McMaster-Carr check valve is? How it works? How will it help me?
Thanks,
Mike
When you say LS6 setup are you referring to the intake manifold? If so, I thought that only replaced coolant tubes, not PCV tubes? Not sure what you are taling about.
Obviously I am open to suggestion at this point. Could you explain what the McMaster-Carr check valve is? How it works? How will it help me?
Thanks,
Mike
Re: PCV issues Do I have more PCV work to do? All I did was put a check valve in the hose between the passenger side valvecover and the throttlebody - should I do more than that?
-Geoff
-Geoff
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From: Norfolk VA
Re: PCV issues
AG,
When you say LS6 setup are you referring to the intake manifold? If so, I thought that only replaced coolant tubes, not PCV tubes? Not sure what you are taling about.
Obviously I am open to suggestion at this point. Could you explain what the McMaster-Carr check valve is? How it works? How will it help me?
Thanks,
Mike
When you say LS6 setup are you referring to the intake manifold? If so, I thought that only replaced coolant tubes, not PCV tubes? Not sure what you are taling about.
Obviously I am open to suggestion at this point. Could you explain what the McMaster-Carr check valve is? How it works? How will it help me?
Thanks,
Mike
The LS6 PCV setup pulls from under the intake, some say it does not pull in as much oil as the LS1 valve cover setup does. Just by looking it does look like better place to pull a vacuum and not pull in oil back into the intake track. JMx has it on his website, great write up. www.ls1howto.com Nothing hard, rather cheap and I hope it works. Then route it back down to the blower inlet hat.
Just an idea, anyone else with any feedback?
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Re: PCV issues Mightymouse tried the ls6 valley cover/pcv setup on his car, with no perceived difference than the ls1 style. A check valve in the loctaion white hawk descrived will either a) allow boost into the crankcase, or b) not allow fresh air to come in the front port, depending on the direction of allowed flow. In the case of b), the vacuum at part throttle would not pull anything into the intake since there would be no way for new air to come in. In a), we all know what that would do. 
Re: PCV issues
A check valve in the loctaion white hawk descrived will either a) allow boost into the crankcase, or b) not allow fresh air to come in the front port, depending on the direction of allowed flow.
-Geoff
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Re: PCV issues The tb tube does not pull the vacuum. Think about the engine at idle. Inside the manifold you see about 19 inches of vacuum, right? So that vacuum is pulling on the hose that runs to the pcv valve. The pcv valve will be open when the intake side is under less pressure (more vacuum) than the valvecover side. So this vacuum extends through the pcv to the crankcase. Now you've got a vacuum pulling there. The only other entrance for air into the crankcase is the front tube on the passenger side valve cover. That tube runs to the top of the tb. That port has a hole that goes to the front side of the throttle blade, the area where there is no vacuum. So air gets sucked in that whole route. There is no vacuum pulling air from the valve cover to the tb, only air going from the tb to the valve cover. Under part throttle, the effect is the same, just less vacuum so there is less pull. At wot the pressure on both sides of the tb is equal so there is no vacuum anywhere.