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Registered:
June 2003
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oil in compressor housing/new turbo
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Sat, 03 April 2004 12:12
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the rb20det turbo is on, i have just added a intercooler and it has a air leak problem somewhere as i cannot get much boost, but i have not overspun it etc.
also today after pulling the intake stuff off, i found just as much oil puddled in the new rb20det compressor housing intake etc as the old ct20, i have a peice of copper tubing about 5cm long and about 1.2mm I.D as the restrictor, is there still too much oil getting past the seals or is the fact that im not getting positive presure while its spinning up allow oil past the seals? (i doubt it)
when u dont have a small enough restrictor what will happen, will the oil go out the exhuast? or will it go out the compressor housing as well?
im assured the turbo is in reasonable/non leaking condition and this is pissing me off.
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Location:
Kita-Ku, Sapporo, Japan
Registered:
January 2003
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Re: oil in compressor housing/new turbo
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Sat, 03 April 2004 13:26
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dumb question, but are there any lines going from PCV, cam cover breather etc etc, to the intake? any way any other oil containing air could be getting into the intake tract, either before or after the turbo?
Cya, Stewart
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Location:
Newcastle
Registered:
May 2002
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Re: oil in compressor housing/new turbo
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Sat, 03 April 2004 21:11
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Sound like blow-by to me.
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Registered:
June 2003
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Re: oil in compressor housing/new turbo
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Sun, 04 April 2004 05:45
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no its deffinatly oil getting past the seals because I dont have the breather etc attached, and the sump is deffinatly not becomign pressureised.
However the oil return line is pretty much horizonal with a little wee down hill..but if oil was backing up in the turbo doesnt it come through the turbine housing?
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Location:
Brisbane
Registered:
February 2003
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Re: oil in compressor housing/new turbo
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Sun, 04 April 2004 06:21
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you need the oil drain exiting into the sump ABOVE the normal level of oil. If you pressurise the bearing housing and the oil is prevented from leaving the housing, that oil there will heat up and - even with the water cooling - fail to do it's job of lubricating the bearings and you end up with a $1900 door stop.
having the crankcase presured will only add to drainage problems.
it's essential that any forced induction engine is able to evacuate excess pressure from the crankcase. Cause if the turbo seals don't fail from this, then the front or rear engine seals will happily oblige.
sort your crankcase ventilation system first then the drain, then see if the oil pooling continues.
some of the more experienced turbo dudes here might be able to advise if the seals are stuffed if oil has been pushed past...
oh... i think that if oil leaked past the exhaust turbine seal from the bearing housing you'd have a fire, not just smoke. The smoke you see is form the engine burning up the oil introduced into the intake/induction system.
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