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2006 L61 PCV operation with LSJ intake manifold and gasket
I am trying to figure out how our PCV works when we swap to the LSJ intake manifold. I didn't know to pay attention at the time of installation but it looks like the portion of the PCV that used to route to the intake manifold is now blocked off. I am thinking that it is blocked off making the nipple on the valve cover function as a vent of positive pressure only. Any feedback from anyone with insight on this would be greatly appreciated.
To answer your question, there is no operation lol. Only way ive seen to fix it is to add a phenolic spacer and grind out a path for the pcv gasses to follow.
To answer your question, there is no operation lol. Only way ive seen to fix it is to add a phenolic spacer and grind out a path for the pcv gasses to follow.
So right now the nipple on the valve cover is just functioning as a vent so it really shouldn't matter if I just use a breather filter. What adverse affects could this have on the engine? Is it worth figuring out a work around?
Slowbalt, are you running a modified phenolic spacer or is the LE5 different?
Couldn't I just run an external PCV valve and route it it to the back side of the throttle body but before the supercharger? If I did go the phenolic spacer route how would my stock PCV port handle boost? I don't know much about PCV operation other than what I have read up on.
So I have been doing a little research on PCV systems and it seems that while idling the PCV valve limits flow so as not to raise RPM or lean out. When cruising it seems like that is when I am missing the most benefit because the PCV valve is closest to full flow at less of a vacuum. As soon as I get into boost it sounds like the PCV port to the intake manifold closes off so under load/acceleration I'm not really missing any benefit. This is all just my understanding and I may be mistaken.
I was thinking and wondering why I couldn't just rig up an external PCV valve by tapping into the valve cover and the intake manifold. Do any of you see any problems with this?
Btw the whole reason I looked into this is because I'm consuming a bit of oil at autocross events. I don't seem to burn a noticeable amount daily driving or even drag racing. Is using a little oil common at all when driving that hard with hard consecutive corners?
You could do that but idk if i would do it on the vc, thats supposed to be for fresh air inlet. If you take the bc off you can see the pcv ports on the head i believe theres three on the front and two on the back. You can see how it lines up with the manifold. I would drill the head and run the valve off of that, like how the stock system works.
You could do that but idk if i would do it on the vc, thats supposed to be for fresh air inlet. If you take the bc off you can see the pcv ports on the head i believe theres three on the front and two on the back. You can see how it lines up with the manifold. I would drill the head and run the valve off of that, like how the stock system works.
I would still have the nipple that's there be the fresh air inlet. I would tap a new fitting for the PCV valve. Correct me if I am wrong but I am thinking the PCV is integral in the head for cost savings. It shouldn't make much of a difference if it is sucking thorough the valve cover or the head because they are both allowing airflow in the same relative area correct? As long as I set it up so the air has to flow across the top of the head I would think it should work but I don't know for sure.
The valve cover has a baffle built in to seperate the air from the oil, i guess twchnically it would still work that way. L61/le5 dont have a pcv valve its just the fixed orifice you see when you pull the manifold off, lsjs do use an actual valve in the manifold. Like i said earlier, easiest way is to get a phenolic spacer.
The valve cover has a baffle built in to seperate the air from the oil, i guess twchnically it would still work that way. L61/le5 dont have a pcv valve its just the fixed orifice you see when you pull the manifold off, lsjs do use an actual valve in the manifold. Like i said earlier, easiest way is to get a phenolic spacer.
Is the orifice open all the time or is there some kind of check valve in there?
I run a lsj/b207 intake manifold on my 2001 L61 2.2 ecotec (turbocharged)
I've blocked the checkvalve in the manifold between runner 2/3 (cause I dont want boost into the crankcase) and put a hose on the valvecover pipe to a catchcan with breather.
07-07-2016, 01:38 PM
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