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The setup I have installed does two things:
1. It prevents oil mist from passing through the throttle body inlet during open throttle - which avoids idle-bypass clogging.
2. It filters out oil mist during closed-throttle oil mist intake from the valve cover atmosphere while in high-performance mode - which causes smoke out the tailpipe as the oil is burned in the combustion chambers.
I have been running with this setup for about three years now.
It works. No major smoke plume at all now... which your stock S will indeed do for certain on any GT course if driven hard.
Valve cover atmosphere is allowed to breathe while fumes are allowed to be burnt off in negative, closed intake valve vacuum while strained from oil mist.
If one were to put both the PCV and breather outlets of the cover to be put in to a "Y", then that would kill flow. A "Y" is not the way to go because it would kill air flow in the valve cover. Might as well plug both ends of the valve cover!
My cheap setup allows for clean ventallation of gasses within the valve cover without sucking in oil mist into the intake manifold or introducing oil mist to the throttle body.
Very simple, very cheap, and it works.
No more smoking during events and stray gasses are burned during closed-throttle intake vacuum.
All is well.
Splndid could you please post a pic of your set up. Very instructional thread..but still... I have my doubts about having one. Based on your post and Steve's from Evolution I am very interested in finding out more set up possibilities.
But, any one that runs on the track or autocross that has one is primarily trying to stop the embarrassing smoke screen. It's annoying when the smoke screen happens and you have to explain to people that nothing is wrong with your car. It can hold up events or get you banned from running on that day when nothing is truly wrong. If I did not autocross I would not have one.
The condition that causes oil to get sucked into the intake is a turn to the right, usually a hard sweeper. Oil gets sloshed up to the PCV valve and drawn into the intake. The oil catch prevents the oil from getting sucked into the intake and thus stops it from getting burned. MY04 and up has a redesigned valve cover that reduces this from happening, but it still can on the track.
My setup using air compressor filter is shown below. To empty you just unscrew the bowl and dump it out, put it back on. I autocross twice per month, so it gets emptied before each event. There have been a couple of occasions where I had to empty it after each couple runs because of the particular course setup.
Mounted on shock lower right
Oil caught after 1k miles running on the street
Damn I just read most of this thread and was thinking of using the same thing. It would be nice if your return tube was clear to see if any vapor was returning. It looks like it catches a lot.
Originally Posted by dtmcnamara,Mar 3 2008, 04:54 AM
so what about running the PCV valve hose and the crank case hose into a Y-fitting and throwing them both into a catch can then running a line back to the intake manifold (kill 2 birds with 1 stone?) I went through and looked for this but never got a straight answer. I think someone mentioned it but no one ever responded.
From what I read the crank case vent actually I guess can be called an intake for the engine and the PCV is the exhaust. You don't want to tie them together.
Wow! That's a lot of oil! Great design for your oil mist catch can!
For the sake of debate, I believe that my catch can is cheaper and easier.
For street, one need not to worry about a catch can.
For track, and for the AP2 engines, I believe that a cheap fuel filter between the PCV and the intake manifold is all that is required.
After being black-flagged for smoke at a track event, I put in the cheap fuel filter between the PCV and the intake manifold, and I never saw smoke at the tail pipe again. I also plugged the breather inlet at the intake manifold (before the throttle body) and installed an after-market breather filter at the front of the valve cover.
Hey! Whatever works! But I gotta sell you on the cheaper fuel filter just for track days design. It works fine.
