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#906139 - 05/22/07 08:24 PM Air/Oil Separator for Subaru STi?
sekretskwirl04 Offline


Registered: 05/18/07
Posts: 19
Loc: Tahoe, CA
My first post in this forum. Great place and love the tech'. Anyway track season is here and we are looking for a viable A/I Separator for our 04 STi. Crawford makes one...a real nice one that is Subaru specific and well engineered BUT it costs 360$ Uh huh. Waaay TOO MUCH for a simple device IMO. I found a Moroso at Summit for 95$ and a Jegs for 45$. They all look like the same thing> hoses in/hoses out. I'm not sure if these will work with a forced induction motor though.We want to recirculate the oil back into the block for sure and not vent it. Ideas? thanks Danielle

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#906140 - 05/24/07 03:28 AM Re: Air/Oil Separator for Subaru STi? [Re: sekretskwirl04]
outersquare Offline


Registered: 06/02/03
Posts: 202
Loc: sokali
if you mean an oil catch can, you can rig one up for $20;

http://www.k20a.org/forum/showthread.php?t=10278

btw, don't use clear lines like those pics, use fuel/egr lines and yellow teflon tape.

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#906141 - 05/24/07 04:09 PM Re: Air/Oil Separator for Subaru STi? [Re: outersquare]
ccs v2.0 Offline


Registered: 08/07/06
Posts: 567
Loc: IL
The thing to watch is that the reservoir may not be compatible with synthetic oils and, after a while, as the oils starts 'eating up' the plastic, you'll see the walls becoming cloudy. IIRC, there will be a sticker on most filters with a statement to that fact.
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#906142 - 05/25/07 05:57 AM Re: Air/Oil Separator for Subaru STi? [Re: ccs v2.0]
SamSnyder Offline


Registered: 12/24/06
Posts: 17
Loc: San Fernando Valley
They're selling a few on ebay too. Take a look over there.

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#906143 - 05/26/07 06:58 PM Re: Air/Oil Separator for Subaru STi? [Re: SamSnyder]
AndyH Offline


Registered: 11/07/04
Posts: 2493
Loc: MSP 'burbs, MN
A very slick setup offered for sale over on www.iwsti.com by a forum member:

http://www.iwsti.com/forums/showthread.php?t=68600
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#906144 - 05/28/07 10:29 AM Re: Air/Oil Separator for Subaru STi? [Re: AndyH]
gtx510 Offline


Registered: 04/26/04
Posts: 1463
Loc: CA
Do you think oil would eat the foam in that second separator?

Try googling for "air oil separator". They're common on airplanes and diesel trucks. I've even seen a few sites that show you how to make one. Here's a how-to for a Sube.

An oil catch can isn't an air/oil separator. And you'll get better ring seal if you have the intake drawing air out of the can (after the oil has been removed).

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#906145 - 05/30/07 04:07 AM Re: Air/Oil Separator for Subaru STi? [Re: gtx510]
racer12306 Online   content


Registered: 10/06/05
Posts: 1794
Loc: Baltimore, MD
i have one of the ones made from an air compressor system filter. so far it has been good with a year and a half of service on it, with synthetic oil. thats about 30000 miles for me.

i believe you want to make sure you have a check valve as to not send boost up into the valve cover.
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