Burning Oil???

Derek Pulvino dbpulvino at hotmail.com
Tue Oct 3 20:13:24 EDT 2006


Reading this, I guess you don't necessarily buy off on the turbo culpability 
theory?  Jeff, were you able to solve your problem by replacing/rebuilding 
the 924 turbo?

Derek P

> > Derek,
> >
> > The oil burning that you are describing sounds like a turbo going bad to 
> > If, as was mentioned in an earlier post, you have smoke on long 
> > then I would suspect valve seals.   If you don't get smoking on long
> > deceleration then it is most likely turbo seals starting to fail.  The 
> > of smoke on acceleration after idling sounds like too much smoke for a 
> > seal problem to me.
>Could be, Jeff. If so, one would find the intake plumbing from turbo to
>throttle body flooded with oil. An easy check Derek. This intake piping and
>the IC will usually be lightly oil wetted inside, but not flooded.
> >
> > The smoking on long idling is exactly what would happen on my Porsche 
> > Turbo and my Audi 5000CS Turbo when the turbo seals were failing.  
> > when the car idled for any length of time with the oil pressure being 
>very low
> > it would allow a lot of oil past the seals.  As soon as you accelerate 
> > burn the excess oil out of the turbo at a fast rate which makes a huge 
> > of smoke.  Under normal running conditions the oil pressure was 
>sufficient to
> > keep the seals from leaking on the turbo.
>Not the likely scenario, Jeff. There is lots of oil storage area from the
>turbo to the TB from a leaking turbo, but nothing excepting the cylinder 
>a valve stem seal leak to go. Turbo seals are labyrinth, not contact seals
>and are on the drain sides of the bearing, not the pressure side. Their
>leakage is not supply pressure dependant, but is primarily turbo bearing
>wear dependant.
> >
> > Jeff Bernstein
> > Canton, Oh

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