What is the cause of
Thread Starter
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Joined: May 2004
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From: R.I.P Piphead, at least you are home now :(
What is the cause of
Oil in intercooler & associated pipework
I know its relatively normal to have a bit, but what exactly causes it, and apart from fitting a catch can, is there anything else that can be done to reduce it
I know its relatively normal to have a bit, but what exactly causes it, and apart from fitting a catch can, is there anything else that can be done to reduce it
Joined: Apr 2002
Posts: 38,078
Likes: 310
From: The hell where youth and laughter go
It's caused by a couple of things:
Minor leakage past Turbo oil seals. Wear and tear, not much you can do about that.
And -
Oil mist and vapourised oil in the crankcase.....
Seeing that the crankcase breathers run into the inlet tract, and there is always positive pressure in there from blow-by gases and the PCV valve, any oil vapour and mist in there will go into the inlet tract. Devices like oil seperator and windage trays help reduce this (already fitted - although I suppose they could be modified - never seen one on the market though). But you'll always get some oil blowing through, especially as the engine starts to wear and you modify it and run higher boost pressures.
Minor leakage past Turbo oil seals. Wear and tear, not much you can do about that.
And -
Oil mist and vapourised oil in the crankcase.....
Seeing that the crankcase breathers run into the inlet tract, and there is always positive pressure in there from blow-by gases and the PCV valve, any oil vapour and mist in there will go into the inlet tract. Devices like oil seperator and windage trays help reduce this (already fitted - although I suppose they could be modified - never seen one on the market though). But you'll always get some oil blowing through, especially as the engine starts to wear and you modify it and run higher boost pressures.
Last edited by ALi-B; Oct 3, 2004 at 03:47 PM.
Thread Starter
Scooby Regular
Joined: May 2004
Posts: 10,026
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From: R.I.P Piphead, at least you are home now :(
Cheers for that Ali
I replaced my intercooler hoses today, and noticed a bit of oil, mostly in the Y piece, and throttle body hose
But recently I had noticed a small amount of oil around the turbo (again on the hose)
When I took the old Samcos off the end that connects to the turbo, was pretty well worn away, and the oil around the turbo will have been leaking from there I imagine
Ive now replaced it with a proper STi metal Y piece, and the fit is a lot lot better, and tighter, so all being well I wont see any more oil deposits on the compressor housing
Engine is MY00 with PPP and done about 48k miles now, and has on occasion had higher boost pressure
I have a new VF24 turbo to go on, once I get the remap funds sorted
I replaced my intercooler hoses today, and noticed a bit of oil, mostly in the Y piece, and throttle body hose
But recently I had noticed a small amount of oil around the turbo (again on the hose)
When I took the old Samcos off the end that connects to the turbo, was pretty well worn away, and the oil around the turbo will have been leaking from there I imagine
Ive now replaced it with a proper STi metal Y piece, and the fit is a lot lot better, and tighter, so all being well I wont see any more oil deposits on the compressor housing
Engine is MY00 with PPP and done about 48k miles now, and has on occasion had higher boost pressure
I have a new VF24 turbo to go on, once I get the remap funds sorted