Doug Mitchell writes:
> If you want to see something neat, look at a turbo when it is
> running at full rpms. Glows a beautiful color. When I worked
> in the engine dynos at Ford, we used to run tractor and heavy
> truck engines at full load, wide open throttle to check them
> out. The turbos were glowing cherry red. Understood why it was
> necessary to keep the engine running for a few minutes after
> a hard run with the boost on.
Probably the reason why so many manufacturers have been moving to ceramic
impellers (those seem to have their own set of problems, though, such as
cracking at stress concentration points--for a while in the mid-90s, Detroit
Diesels were shelling them fairly regularly).
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