Official Turbo LSJ thread!!!
08-07-2013, 11:13 AM
#6301
A) don't understand how the PVC system is supposed to work
Or
B) they don't care and just want to vent blow-by while catching the oil vapor.
08-07-2013, 11:15 AM
#6302
It runs from where my screwdriver is pointing to under two or three air oil separators. They are removed here.
Look where my thumb is at. You can see that same hole coming from the back of the head moving to the front of the head/VC. Its a long narrow passage way.
Look at the top you can see near the timing area that long aluminum tube built in from the back of the VC to the front to where the AOS are. If this was pressurized there would be no need for the AOS because air would be put into the crank case. There is no source to pressurize the the crank case on an LSJ except people with bad rings.
The hole at the head is just as small btw. Its just a second VAC source.
08-07-2013, 11:24 AM
#6303
No, I'm talking about lsj. I'm not going to sit here argue with you about it because you clearly have your mind made up.
For those that care,
That rear line going to the intake post maf so that air entering the case is metered and won't cause idle issues. There's baffles because no matter how good of shape an engine it in, there will always be some amount of blowby. These baffles done work very well though, which is why you get that gummy oil on the tb and sc inlet.
For those that care,
That rear line going to the intake post maf so that air entering the case is metered and won't cause idle issues. There's baffles because no matter how good of shape an engine it in, there will always be some amount of blowby. These baffles done work very well though, which is why you get that gummy oil on the tb and sc inlet.
08-07-2013, 01:53 PM
#6304
No, I'm talking about lsj. I'm not going to sit here argue with you about it because you clearly have your mind made up.
For those that care,
That rear line going to the intake post maf so that air entering the case is metered and won't cause idle issues. There's baffles because no matter how good of shape an engine it in, there will always be some amount of blowby. These baffles done work very well though, which is why you get that gummy oil on the tb and sc inlet.
For those that care,
That rear line going to the intake post maf so that air entering the case is metered and won't cause idle issues. There's baffles because no matter how good of shape an engine it in, there will always be some amount of blowby. These baffles done work very well though, which is why you get that gummy oil on the tb and sc inlet.
But for those that care...
08-07-2013, 03:11 PM
#6305
No, I'm talking about lsj. I'm not going to sit here argue with you about it because you clearly have your mind made up.
For those that care,
That rear line going to the intake post maf so that air entering the case is metered and won't cause idle issues. There's baffles because no matter how good of shape an engine it in, there will always be some amount of blowby. These baffles done work very well though, which is why you get that gummy oil on the tb and sc inlet.
For those that care,
That rear line going to the intake post maf so that air entering the case is metered and won't cause idle issues. There's baffles because no matter how good of shape an engine it in, there will always be some amount of blowby. These baffles done work very well though, which is why you get that gummy oil on the tb and sc inlet.
08-07-2013, 04:07 PM
#6309
1 the pcv port in the head that is a direct feed
2 the vent line from the back of the valve cover
the oil dose get into the intake tube from the manifold it gets there from the vent line from the back of the valve cover
when driving normal your pulling vacuum from the head and the vent line but more from the head as the vent line is restricted a lot more now when you build positive manifold pressure the check valve closes off the port in the head and then you are relying on the vent line from the back of the valve cover and that is where you get oil in the intake tube
that is why you run a good quality air/oil separator and increase the line size on the back of the valve cover and plug the head and keep it a closed system
and never gut the valve cover
08-07-2013, 04:58 PM
#6312
The way john has now explained it is the way I had always believed it to work. He threw me for a loop when he worded is as he did above. I thought he was saying that the valve cover to intake line had no ventilation function and was strictly for clean air intake into the crank case at all times. Which is why I asked him to clarify, which he did.
08-07-2013, 05:27 PM
#6313
The way john has now explained it is the way I had always believed it to work. He threw me for a loop when he worded is as he did above. I thought he was saying that the valve cover to intake line had no ventilation function and was strictly for clean air intake into the crank case at all times. Which is why I asked him to clarify, which he did.
secondly as mrb said dont gut the VC, there is no need, I did it a year ago thinking I was going to reinvent the wheel. If you want to tap it like I did that is fine, just leave the baffles/steel plate in place. I have another VC that I am having powerdercoated and leaving the baffles/steel plate in place. I am going to tap it however like I did above for my catch can and vacuum source just above the steel plate to allow for extra crank case venting.
08-07-2013, 05:56 PM
#6314
The vc port IS a fresh air inlet. Study some basic physics. At part throttle the post tb vac is greater than the intake tube, so the check valve in the head/IM pulls vac on the case. It wouldn't do any good to just suck on the case though; the while point it to get the vapors out. That's what the fresh air inlet is for.
Some of you really need to do some research on how the system works. It's NOT that ******* hard to understand.
08-07-2013, 06:38 PM
#6315
Oh geesh here we go with the engineering/physics crap. Like everyone has or needs a degree. Funny you mention it thought I am starting my third year of school (Embry Riddle aero engineering) this semester.
Anyway if you plump your existing vent/custom vent into an oil catch or separator then to your turbo intake (like many of us here have done) you will be fine. I have read a lot of threads on these setups over the months and I see now why MRB has popped a blood vessel in his forehead over this. Its super simple and everyone including my self at one time or another had made this overly complicated.
Anyway if you plump your existing vent/custom vent into an oil catch or separator then to your turbo intake (like many of us here have done) you will be fine. I have read a lot of threads on these setups over the months and I see now why MRB has popped a blood vessel in his forehead over this. Its super simple and everyone including my self at one time or another had made this overly complicated.
08-07-2013, 08:13 PM
#6320
Oh geesh here we go with the engineering/physics crap. Like everyone has or needs a degree. Funny you mention it thought I am starting my third year of school (Embry Riddle aero engineering) this semester.
Anyway if you plump your existing vent/custom vent into an oil catch or separator then to your turbo intake (like many of us here have done) you will be fine. I have read a lot of threads on these setups over the months and I see now why MRB has popped a blood vessel in his forehead over this. Its super simple and everyone including my self at one time or another had made this overly complicated.
Anyway if you plump your existing vent/custom vent into an oil catch or separator then to your turbo intake (like many of us here have done) you will be fine. I have read a lot of threads on these setups over the months and I see now why MRB has popped a blood vessel in his forehead over this. Its super simple and everyone including my self at one time or another had made this overly complicated.
And as good of friends as John and I are, he doesn't either.
YES a big ass hose and vent into a can will keep your dipstick from popping and keep oil out of the intake. But that is NOT the only purpose of pcv. Trevor is one of the few in this combo that gets it. Sylvester is on the right track as well.
John feel free to call and yell at me
I learned all of this pcv stuff from someone smarter than half of us put together. You guys are the ones mixing up 2 different ideas and focusing on the wrong one.
08-07-2013, 09:55 PM
#6322
Anyway, maybe this will make better sense to some of you:
https://www.cobaltss.net/forums/7035549-post27.html
08-07-2013, 10:38 PM
#6324
