Thus spake Tegger <invalid@invalid.inv> :

>jim beam <me@privacy.net> wrote in
>news:IqKdnS8WKrBvPgfXnZ2dnUVZ_qGdnZ2d@speakeasy.n et:
>
>> Dillon Pyron wrote:
>
>>>
>>> And if you have a turbo, make sure it idles for at least 30 seconds,
>>> unless you have some sort of additional pressure oiling system.
>>
>> pressure isn't the issue with a turbo, it's "heat soak". heat from
>> the turbine conducts back to the shaft and the bearings after it's
>> switched off and cooks the oil in it. allowing the turbine to cool by
>> idling [some trucks used to spec three minutes] before switch off
>> mitigates this. using an oil that can take the heat [synthetics] is
>> strongly recommended.
>>
>
>
>I think what Dillon means is the sort of system that maintains oil flow
>through the turbo for X-minutes after engine shutdown. Such a system is
>meant to prevent the oil in the turbo from being heated to the point of
>coking.

Yeah. Since I don't race "tin tops" any more, I can't remember the
name of the system that did that. It would store up about a litre of
oil in a little resivor and then use either air pressure (via a
piston) or an electric pump to push the oil into the system. They
also had one that primed the system at startup.

With three pump dry sump systems, I don't worry about that, much.
--

- dillon I am not invalid

"Iran wants nukes? North Korea wants nukes?
I'm sure we can give them some. Or the Navy."

- former B52 wing commander