Turbo Coking - wasRe: <VV> Curious Question - idling

[Bill Elliott]

Also, a REAL good reason to run synthetic oil in any turbo engine, new or old.

Bill Elliott

>> The only vehicle I idle for any period of time to allow for cooling is my 
>> Dodge truck with its Cummins diesel engine.  I try to let the exhaust 
>> temperature gauge (turbocharger) cool below 350F before shutting down so as 
>> to not cook the oil in the turbocharger bearings.  Usually this ends up 
>> being less than a minute.
>> 
> Dale,
>       That's exactly what's recommended in the Turbocharging Chapter in the 
>Corvair Basics Manual - letting the turbo Corvair engine idle for a few 
>minutes after a hot run so the oil flow continues through the bearing until the 
>turbo cools down.  Otherwise you stand a good chance of "coking" the static oil 
>remaining in the bearing after a premature hot shutdown.