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Old 10-13-2003, 07:16 PM   #1
GravelRash
Scooby Specialist
 
Member#: 16318
Join Date: Mar 2002
Chapter/Region: NWIC
Location: Kirkland, WA
Vehicle:
2002 WRX wagon
Grime over Sedona Red

Default Overfill oil = oil in intercooler

I wrote up my experience in this thread but given the time it cost me I thought I'd make it more visible.
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Old 10-14-2003, 04:16 AM   #2
minix42@
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Member#: 548
Join Date: Nov 1999
Location: pittsburgh, PA USA
Vehicle:
'98 Impreza RS
dinged up faded black

Default

oil in intercooler.... where in the intercooler? your "write up" in the other thread doesn't say very much. You just have an air-to-air intercooler? or liquid cooled intercooler? I'm assuming air-to-air... I think this would be fairly normal. I know in my '98 my intake has an oily residue throughout the intake. I believe this is due to unused air being recirculated into the system?
At first, I was afraid you meant oil in the coolant... This is very bad. That was one of the signs before I found out I blew a headgasket. How 'bout some more info here so someone else can help out a bit more.

mike
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Old 10-14-2003, 04:27 AM   #3
Ugly
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Join Date: May 2002
Chapter/Region: NESIC
Location: West Hartford, CT.
Vehicle:
02 WRX

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Im pretty certain that the oil in the intercooler was just blowby. Putting too much oil in your car isn't the greatest thing in the world, but oil in the intercooler is quite normal in the WRX intercooler w/o running a catch can.
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Old 10-15-2003, 03:29 AM   #4
GravelRash
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Member#: 16318
Join Date: Mar 2002
Chapter/Region: NWIC
Location: Kirkland, WA
Vehicle:
2002 WRX wagon
Grime over Sedona Red

Default

Ahhh...sorry 'bout the lack of detail. The IC is stock, as was all the plumbing at the time.

(You guys presumably know this, but for everyone's benefit...)
The PCV valve vents crankcase vapors to the intake manifold when there's a vacuum there; it vents to the intake when there isn't a vacuum in the manifold. The PCV to intake hose is the large one on top of the intake hose about 3" before the turbo.

Ugly: so...if oil in the IC is normal, how much is normal? I wouldn't think normal crankcase vapors would result in enough oil to be dripping out the throttle body spigot...but then I'd never checked before the overfill. At least I hope I'm not getting that much blowby and/or oil frothing

To prevent/minimize oil in the IC I added a catch can, as noted in the other thread. Unlike some other installs mine only intercepts the line going to the intake hose. It's output side goes back to the stock location on the intake hose. Any gases/air or vapor that doesn't condense in the can will still be vented back to the engine to be burned with the intake air, as originally designed.

Whatever is/was "normal" should now be showing up in my catch can; I'll check it again to see.
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Old 10-16-2003, 04:29 AM   #5
minix42@
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Join Date: Nov 1999
Location: pittsburgh, PA USA
Vehicle:
'98 Impreza RS
dinged up faded black

Default

dripping?!!! yikes. I don't know about that. Mine had a thick film coating the inside of the intake, but yours does sound excessive. Any WRX owners have something to say here. Since mine's not tubrocharged it's not exactly the best comparison.
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Old 10-21-2003, 12:23 AM   #6
GravelRash
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Member#: 16318
Join Date: Mar 2002
Chapter/Region: NWIC
Location: Kirkland, WA
Vehicle:
2002 WRX wagon
Grime over Sedona Red

Default

Fwiw, I've got ~3k miles on since I cleaned out the IC and added the catch can. I had occasion to pull the IC again yesterday - clean and dry! No film at all, at least on the outlet side.

And the catch can is also as clean as when I added it. So I'm even more convinced that my overfill episode led to the exess oil going back to the intake.
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