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catch can install


Sickman
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Hi I’ve been a member for a while but have never introduced myself and have generally been poaching tec info from this site. However the time has come to ask a question.

i have a 1995 uk Impreza. Had the engine rebuilt 2.1 stroker etc.

it then sat around after a respray for about ten years. Last year I finally got a running in map and all was good. I was about to upgrade turbo sports cat and it started smoking under boast so I had a look and the intake has oil in it so I’m now fitting a catch can.

ive looked at a million threads but cant find a picture. I’ve taken some breathers off near under the turbo and expected to see the psv  valve but it’s just a copper looking pipe coming out of the crank case. 
 

im probably about to get spanked for being a noob and posting in the wrong place!

cheers

Alex

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Ok well every breather joint on the way to the intake has a small amount of oil around it. The intercooler and hoses has oil in it. From what I have read this is a breather problem which is common and I need to fit a catch can or my rings are gone which I hoping they’re not cos the engine has only done a few thousand miles. 

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The pcv valve is directly below the throttle body on the inlet manifold,  the other 2 oil breathers are on top of each cam cover .

Just make sure of you disconnect the oe oil breather system, that you "bung " any un used pipe take offs ... ie the one that goes to the intake pipework and 1 of the outlets on the crank breather y pipe 😉

Excessive oil burning could be due to a turbo seal or rings , are you getting much pressure when you take off the oil filler cap when running? 

This might indicate blow by , combustion gasses getting past the rings ,leading to excess crankcase pressure and the oil burning 

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Cheers savage I’ll install the catch can as per your directions and then I’ll check the oil filler cap. I pretty sure there was no pressure there the last time I took the filler cap off when it was running but I need to get it back together to check it now

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Although it would make sense if it's a 1 way valve , Otherwise boost would blow out of the inlet into the crankcase . I'd imagine you'd need to block it off as I don't know what pressure it operates at and it might suck air into the manifold at idle vacuum. 

Tbh my pcv inlet manifold hole had been welded up before I fitted my can 😊

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