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post #1 of 11 Old 07-06-2012, 11:39 AM Thread Starter
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Yet another crankcase ventilation question

Ive read this topic to death and feel like I am finding conflicting theories of what actually works. I have a freshened up stock 302 in my 94 cobra with a 70mm turbo. My seals don't seem to me leaking and my dipstick isn't getting blown out. However, I currently run the stock pcv valve and I have the oil filler neck tube not connected to anything and its starting to blow out a little oil.


I just ordered a full catch can setup through race parts solutions, great company to deal with btw. I don't really want to hack up my stock cobra valve covers to install this unless I have to. A catch can setup just seems a little over kill for my setup, only running 9-10lbs of boost making 400/450.

Could I just run a vacuum line from the oil filler tube, put an air/oil separator in-line, and hook it into the air filter pipe just before the turbo? Any downsides to this set-up?

Also, I have read about running a breather but I don't want an oil mist everywhere as just this little bit is driving me crazy. Also, if I have understood correctly, will suck in un-metered air causing a lean idle, which I currently have. Its not terrible tho, about a 15.8 af reading.

Thanks guys


94 Rio Red Cobra, Trickflow 170s, F cam, T-moss ported lower, Fox intake swap, 3.73s
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post #2 of 11 Old 07-06-2012, 02:55 PM
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Why not just put a small breather on that tube and wrap a wrist band around it so you dont get a oil mist...change out wrist bands now and then,.....


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87 GT Vert.On3 turbo making 14 psi,Trickflow TW 170cc heads,TF street heat intake,70mm TB,stock cam,1.6 roller rockers,Snow performance stage 2 meth kit,42# injectors,340 lph fuel pump,AOD,Lentech VB,electric OD 3000 stall.3.55's
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post #3 of 11 Old 07-06-2012, 03:33 PM
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post #4 of 11 Old 07-06-2012, 04:11 PM
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Mustang Low Profile Screw In Breather Filter

Current: 04 Gt, sonic blue, 3.73s, 2.5" custom o/r exhaust, diablo tune, cai.

Sold: 90lx, stock short block & cam, TFS 170's, 1.72rr, typhoon intake, on3 kit 70mm, AOD, 4.10 gear, cobra 39s, C&L maf, stock tune, 11psi boost
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post #5 of 11 Old 07-06-2012, 06:28 PM Thread Starter
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Why not just put a small breather on that tube and wrap a wrist band around it so you dont get a oil mist...change out wrist bands now and then,.....
Wouldn't that still allow un-metered air into the engine? I also haven't had much luck finding a breather that small. I am just wondering if running that to my air filter pipe before turbo would be the optimal set up.

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post #6 of 11 Old 07-06-2012, 06:30 PM Thread Starter
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Is this what you use? In combination with the pcv I assume? I thought I remembered reading a thread a while back about this not being efficient with a turbo application, but I may be wrong.

94 Rio Red Cobra, Trickflow 170s, F cam, T-moss ported lower, Fox intake swap, 3.73s
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post #7 of 11 Old 07-06-2012, 06:33 PM Thread Starter
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Well wouldn't I truly want a breather on each valve cover? If im gonna go through the work of getting one put on the other cover I think a hidden catch can setup looks cleaner. Just my opinion

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post #8 of 11 Old 07-06-2012, 09:24 PM
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Originally Posted by AJs94cobra View Post
Wouldn't that still allow un-metered air into the engine? I also haven't had much luck finding a breather that small. I am just wondering if running that to my air filter pipe before turbo would be the optimal set up.
I found one that small at advance...I ran it like that when my car was supercharged 10 psi no problems at all....

Turbo installed!!!!
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post #9 of 11 Old 07-07-2012, 12:15 AM
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So far the best setup I have read about goes as follows.

- Baffled -10 or -12 fittings, one in each valve cover.
- Run both lines to catch can.
- Run a pcv valve from a turbo coupe with oil seperator inline.
- only thing I wonder is if it is best to vent the catch can with a filter or to run a -12 to the inlet of the turbo to eliminate nasty crankcase gasses.
- Also, since most guys run a blow through MAF it is pretty much impossible to get away from the unmetered air condition. From my understanding this can be remedied with the tune/ closed loop adaption.

Thoughts?

Still trying to figure out what I want to do as well. Just want to do it once.

Last edited by Journeyman; 07-07-2012 at 01:23 AM.
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post #10 of 11 Old 07-07-2012, 12:56 AM
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I've been looking this for a few weeks. Just noticed it says "do not use on cars with mufflers" what would the problem be with that

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post #11 of 11 Old 07-07-2012, 01:21 AM
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I've been looking this for a few weeks. Just noticed it says "do not use on cars with mufflers" what would the problem be with that
Backpressure from mufflers will eliminate the effectiveness of these. You need free flowing exhuast to create a vacuum.
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