Burning Oil???

Bernie Benz b.benz at charter.net
Tue Oct 3 20:38:27 EDT 2006

As I suggested Derek, check your intake piping for excessive oil.


> From: "Derek Pulvino" <dbpulvino at hotmail.com>
> Bernie,
> 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
>> me.
>>> If, as was mentioned in an earlier post, you have smoke on long
>> deceleration
>>> 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
>> amount
>>> of smoke on acceleration after idling sounds like too much smoke for a
>> valve
>>> 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
>> 924
>>> Turbo and my Audi 5000CS Turbo when the turbo seals were failing.
>> Apparently
>>> 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
>> you
>>> burn the excess oil out of the turbo at a fast rate which makes a huge
>> cloud
>>> 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
>> for
>> 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.
>> Bernie
>>> Jeff Bernstein
>>> Canton, Oh

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