Re: [DML] Re: Turbocharger availability

[<delornut@xxxxxxxxxxxx>]

The turbocharger technology in the early eighties used a shaft between the 
two impellors that floated in a film of oil. It was actualy a bushing that 
had several oil holes to allow oil to flow through. The reasoning at the 
time was that with shaft RPM's hitting as much as 100,000 RPMs no bearing 
would stand up. Today's turbos use ceramic bearings that can withstand those 
speeds. These older turbo need the oil warmed up to a good flow rate or the 
shaft could rotate while touching the wall of the bushing and cause major 
problems. They don't spin all that fast at idle. When the engine is shut off 
the oil flow stops. A habit of reving the engine just prior to shut down 
will accelerate the rotation of the shaft and then shut off the oil flow. 
Again this causes major problems. Driving the last couple of miles slower or 
allowing the engine to idle for a few minutes prior to shut down will allow 
the oil to cool below the temp that causes it to coke and plug those oil 
flow passages. Turbos have minimal wear when treated right and can last for 
many miles but without exercising the above precautions they can self 
distruct in minutes if not seconds.

Bruce Benson


> Hello..  I have a BAE Turbo that was installed by the prior owner back  on
> May 1, 1984.  When I purchased the car from the original owner he was 
> very
> specific about letting it warm up properly and "cool" down properly. 
> When I
> asked him why I was informed that it may "blow up" if it is not  done.  I 
> have
> always done as he said but am wondering if it is  accurate.  I've never 
> had any
> other problems with the transmission; clutch  or drive train.
>
> Roy
> 0893
>
>
> In a message dated 12/5/2005 10:03:41 A.M. Eastern Standard Time,
> jtrealty@xxxxxxxxxxxxx writes:
>
> The  problem with the turbo is a lot more than just making more
> horespower. When  you start approaching 200 HP you face the "weakest
> link" problem. The  transmission and clutch were not meant to handle
> that kind of power.
>
>
>
>
>
> [Non-text portions of this message have been removed]
>
>
>
>
>
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