Plugged the vacuum line (driver's side) to the rubber flex boot in front of the throttle body, and left the rear (passenger side) set-up alone. I don't see the benefit of having the vacuum line in front of the throttle body throwing oil into the TB, but I left the rear (driver's side) intact so, the motor still has PCV vacuum to suck the fumes from the crankcase. Under boost, there is no vacuum anyway, and I don't want the front of the throttle body creating vacuum sucking oil in the front.

 

a couple of problems, one is unmetered air in the intake system.

remember its a closed PCV system and now you have air entering at the passenger side thats not passing over the MAF.. and second what you did will keep oil off the T/B but not off the I/C

 

Good points. From where am I getting unmetered air now, that I wasn't getting before? I plugged the vacuum source on the driver's side, so same is actually not sucking any unmeterd air from any outside source. On the passenger side, whatever's getting into the motor is coming from the motor and not an outside source. Still unmetered? The PVC valve on the passenger side is the Lightning Enterprise one, which is supposed to restrict upward flow. I shouldn't be getting any more oil than before. Am I wrong? Also, I forgot to mention that I am going to be installing the oil separator between the upper plenum and the passenger side valve cover.

 

your getting unmetered air into the plenum from the crankcase(not the air intake system).....that vacuum you have pulling air from the cam cover puts air directly into the plenum (this air did not pass over the MAF) along with the measured air that passed over your MAF ....

with the hose connected at the drivers side rubber boot the PCV system is closed so air being pulled from the crankcase is equal and now is part of the air intake system......"equal in equal out".... it has to be or the computer will not know its there.


some terms for our PCV system that might help you see it clearly are the drvers side cam cover to rubber boot is called the PCV inlet and the rear of the plenum is called the PCV outlet

A closed PCV system is a component of the air intake system
A partial opened PCV system would be the same as drilling a hole in the top middle of you plenum.

BTW what times are you running in Florida at your H.P. ??? low 12's ?

 

I guess each person has different experiences on this topic.. Since I added the REM seperator I've never had even a hint of oil coming up the driver side and getting on the throttle body. When stock it was bad. Real bad at just 6k miles.

Now I just drain the seperator every 600miles or so and clean it's element every now and then. My thought process on this method is that I've not changed the original system other than to pull the excess oil out of the air stream.

Rich

 

I agree 100% with that .... you maintain a closed PCV system and you limit the oil coating the intercooler. I have to admit a light coating of oil on the intercooler will not hurt performance... Steeles truck ran 12.3 426/517 and his intercooler was caked and he never had a oil control device.

Run a separator or remove it and run breathers, Im still running 3 breathers.

 

Red02- That hose going into the rubber boot is AFTER the MAF . That is unmetered air as well.

 

Try one of these catch cans. they are cheaper than a Greddy, and I know they work better. I bought one, and have it on my truck, and there is no oil at all in the intake manifold.

http://www.accmachtech.com/pcvcatchcans.htm

It even has a steel mesh area that looks kind of like an AC accumulator to catch the vapors that the Greddy doesn't. Not to mention that this one has undercut sidewalls to keep oil from "walking" back up the walls.

Aaron

 

Do you have a picture of how this is installed on your truck? I saw where the instructions said to add a valve for supercharged applications did you do this?

 

Wouldn't any air coming from the valve cover (crank case) of the motor be considered metered air? Unless there are gasket leaks in the motor, I would think that the fumes/blow-by etcetera are all theoretically a source of metered air; air that passed through the MAF, into the combustion chamber and past the rings? Since I plugged the driver's side hole, the only difference now is that the passenger side valve cover vacuum source can not draw in metered air from the driver's side valve cover, but can only draw in metered air that went the long way through the motor; that is, through the combustion process. As an aside, when I shut the truck off, it makes a vacuum squeal for a second or two while the crank case equalizes pressure with atmosphere. It seems that I am running a vacuum in the crankcase now, that with the original vented system, it did not have. Vacuum generally helps ring seal.

 

thanks for this statement It helps me try to explain and may help in understanding.

Correct, the rubber hose is after the MAF So it is metered not ....."unmetered air as well".

This "rubber boot"is the PCV system inlet.....allows metered air into the crankcase. Every unit of air measured equals the same amout that would exit through theoutlet rear of the plenum in a closed PCV system by the computer.

think of the air intake system as linear..... MAF measures a unit/cycle of air. On its way to the cylinder it passes through the T/B-crankcase-plenum-SB-IC-intake galley-exhuast. you wouldnt drill a hole in the T/B, plenum, etc etc...but your are opening a hole in the crankcase if you plug one path through it....

Blown347Hatch has plugged his inlet, so he has a unmetered condition.

....now that he has plugged the PCV inlet the crankcase is no longer a part/component of the Air Intake System on his truck......it is simply a big vacuum leak......and is running lean.


I apologise for my poor Expilation Abilities and thanks for questions that help us all understand....sometimes I need to slow down ....

 

If I already have my drivers side inlet in the intake boot plugged and I am running a breather on the drivers side, then the air from the system is being vented into the atmoshere. No way is it lean. Doesn't make sense to me.Even after reading your post 3 times. If the air thats entering the engine is metered, then the air in the crankcase that is being pulled back in on the passenger side is metered to. No lean mixture. All my air/fuels are perfect. 12.3 to one...across the board.

 

Where I'm (possibly?) in disagreement with Red 92 is his statement that the PCV air I am sucking in from the passenger side valve cover is unmetered. If I left the driver's side open with a breather (it's plugged and sealed), then unmetered air would be entering that same (driver's side) valve cover and would be sucked in from the passenger side valve cover vacuum source (unmetered air because it never went through the MAF). But since the driver's side is plugged, whatever PCV the passenger side valve cover is vacuuming, it's metered air that got there as a by-product of the combustion process. All the air entering into the combustion chamber is metered, so why wouldn't the PCV air (ie the by-products of combustion) also be metered?

 

only in a close PCV system.... Yes your right about the quality of air ...fumes, blowby oil heading to the cylinders as long as you provide a path for it.

Your thinking that the unit of Measured Air that passes into the T/B after the MAF is the same whether the hole in the boot to the crankcase is plugged or not is not correct.

Can you see that if the hole in the boot is open the unit of air passes through the crankcase.

And now if the hole in the boot is plugged the unit of air passes into the T/B to the plenum and now some extra air is introduced into the plenum from the big hole at the rear of the plenum that is letting extra air enter the intake ......

 

Blown347Hatch.........hey we posted at the same time.....I'd like to reply but I'll wait till you read my last