I didn't bother to read the last page here but have a pretty good idea the discussion. You guys know that I have a turbo or supercharged everything....I know how these machines work and understand the differences in the various types. I have also rebuilt turbo's. They are really VERY simple machines, yet very complex only in that the weight of the moving parts must be balanced to a CH(a blonde one). If the supply of oil is volumulas(?) enough and at the correct pressures, since the "bearing" is oil....the turbine/impeller assembly will last a very, very long time.
Turbos placed near the exh manifold do get hot, very hot....I have seen them glow red in the dark. Any questions on heat? YET, because of the magical cooling properties of oil, they are able to function even while glowing red.
It's the same principle of heat shedding....it you wrap a big wad of wet paper towels around a copper plumbing joint, you will not be able to heat the joint enough to melt the solder(453F), even with a turbo-torch because the heat shedding of the wet towels....same thing happens in the turbo bearings....it does not burn the oil but intense heat does reduce it's total ability dramatically, which is why it is cooled so well.
The engineers even 40-50 years ago were pretty good at measuring heat-load. Superchargers were mounted in every WWII fighter worth it's salt......including 12 cyl radial monsters and that was over 70 years ago......
I think this kinda makes everyone a little right...and probably a little wrong too....
I was really fortunate to have been taken under a tuners wing when I raced bikes in the '70s..he taught me that myths are dispelled by personal experience. Hell, we made a Kawasaki H2 triple, TURN! ....but it was pretty philosophical stuff from an old, beat-up motorcycle mechanic. The guy was a fricken genius....
We ALL learn....at different rates and our intelligence is based off the databank we call life-experience....as I get older it's easier to see that I didn't really have to be a dick to someone who might be learning a bit slower......
jeff