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Old 09-06-2002   #1
Ozzy88GTA
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GTA Year: 1988
GTA Engine: 305 TPI Automatic
PCV Mod

Just thought I would share this with you guys (gals). The PCV Mod as known by many is not some I hear around thirdgen F-body groups. I have done some research on this for a while and found that it is used quite frequently on turbo cars to keep the oil from getting to the aftercooler. I also found that many 4th gen f-body owners as well as some truck owners were installing them to control detonation. This all does make sense, the oil will reduce the total octane in the fuel going to the cylinders. It also increases emissions as well as fouling the catalytic converter, valves and intake.
So with that said I decided to do my own. Some use aftermarket catch cans or even homemade ones. The image below shows how I connected mine. The cooler is a copper tubing running in front of the radiator which I plan on replacing with a tranny cooler later on. The separator is a Campbell Housfeld which I got from Home Depot for about $20. The hoses are 3/8" fuel hose from Ace Hardware.
<img src="http://home.earthlink.net/~ozvresto/GTA/images/PCV_Mod.jpg">
The results are not very noticeable as many mods but there is some difference in idle quality as well as some acceleration improvement. After 3 days of running with it there is oil and some small particles of something in the separator bowl that otherwise might have ended up in the intake.

Here are some othe links:
http://www.holdenls1.com/index43.html
http://www.y8s.com/celica/air-oil/

Any thoughts?
-Ozzy

Note: Do not use a vented catch can on a MAF equipped engine since this will upset the air metering by the MAF.

Last edited by Ozzy88GTA; 11-25-2002 at 04:10 PM.
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Old 11-25-2002   #2
Ozzy88GTA
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GTA Year: 1988
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I wanted to bring this one up again to show what this thing is removing from the PCV gases going to the intake. Pretty nasty stuff if you ask me. It had water, oil, sludge and who knows what. The arrow indicates the fluid level collected from just a tank and a half of gas.
<img src="http://home.earthlink.net/~ozvresto/GTA/images/pcv-mod-bowl2.jpg">
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Old 11-25-2002   #3
brandon87gta
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Here is a cheap alternative that the Turbo Buick guys are using. Buy a small Fram fuel filter, I forget the part number but it is 2" long X 1" wide and clear, so you can see the filter for replacement. Run it inline after your PCV before it enters the intake/throttle body. This will keep the oil out of the intake and only costs a couple bucks.

Brandon
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Old 11-25-2002   #4
Ozzy88GTA
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GTA Year: 1988
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Yeah, I've seen that too.
Thanks,
-Ozzy
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Old 11-25-2002   #5
IROC-T
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Ozzy why the cooler? And where did you mount the seperator? I did this on my truck but I used one of those little plastic water seperator that you put on your spray paint gun,that worked but was messy to clean every month. T.
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Old 11-25-2002   #6
Ozzy88GTA
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GTA Year: 1988
GTA Engine: 305 TPI Automatic
The cooler helps cool the crankcase vapors and condenses them before entering the separator. It also protects the plastic bowl in the separator since they have a maximum operating temperature of about 125deg. It may seem like overkill but since the separator is small it removes more oil vapors than without it. When the car is warmed up and running you can feel the temperature difference between the hoses. Here is a shot of the hose routing and mounting. To some the extra hoses in the engine compartment may seem like too much but this is a practical application and not one for show.
<img src="http://home.earthlink.net/~ozvresto/GTA/images/pcv-mod2.jpg">

<img src="http://home.earthlink.net/~ozvresto/GTA/images/pcv-mod3.jpg">

I used the larger separator than the one used in small air compressors. I removed the filter element and used some stainless pot scrubbing pad material to make a separator. This helps collect the smaller particles to keep them from blowing through. I also reversed the flow in the separator, it seems to work better.
Sorry for the lenghty reply.
-Ozzy
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Old 11-25-2002   #7
brandon87gta
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Ozzy88GTA,

I take it you are using the "aluminum foil" stuff, for lack of a better word, to keep the heat off the incoming air right?

Also why did you decide to do the PCV mod? Were you having a lot of problems with crankcase pressure and oil? I was having a similar problem with my GN until I discovered that my K&N breathers would seal shut under 20 psi of boost. After a little trimming of the grommet, problem fixed and no more oil in the PCV.

Another thing with boosted cars is the pressure going back into the engine is greatly increased because of the added boost. This to is bad because it can blow out intake gaskets and such. This is also a simple fix with a check valve, that only allows the pressure to flow one way. It is placed in-line with the PCV just like the filter I mentioned early. Not that this will help to many GTA's, ones that are running superchargers or TTA's might want to look into this.

Brandon
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Old 11-26-2002   #8
Ozzy88GTA
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GTA Year: 1988
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Yes the foil stuff is " Foil Backed Fiberglass Insulation" and it does keep the duct a lot cooler. There are companies selling a similar product for the metal intake pipes used on many compacts.
Anyways, I was browsing around and ran accross a thing called the <a href="http://www.condensator.com/">"Condensator"</a>. Then I ran accross some other articles of guys doing the mod to their cars, some turbos or superchargers and some natural. Me being so cheap decided to build something similar. I wasn't trying to accomplish anything, I was trying to see if I could make one work and see what was being sucked into the intake. I had noticed a lot of oil in my plenum when I ported it so this was a good test to see how much oil was really flowing in the vapors. But yes you are right, this would benefit more those with a power adder or a worn engine with lots of blow-by. Of course mine in no spring chicken either.
-Ozzy
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