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Old 12-07-2006, 11:48 PM   #41
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Old 13-07-2006, 07:45 PM   #42
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Quote:
Originally posted by Jon Fuller
Are you saying that you've seen a compressor housing glow red?

if that much heat were transmitted into the centre bearing assy, it would fkk the oil instantly, ie, enough red heat to conduct into the compressor body, and turn that red too! ...yooo feckin sure?
Yup once or twice on silly power cars

If one half is glowing bright orange then surely some of that heat will transfer through the metal components of the turbo to the other half.

Burty's Cossie did away with the water cooling on the turbo as it was next to pointless at the temps his turbo ran at.
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Old 13-07-2006, 09:26 PM   #43
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Quote:
Originally posted by Jon Fuller
Are you saying that you've seen a compressor housing glow red?

if that much heat were transmitted into the centre bearing assy, it would fkk the oil instantly, ie, enough red heat to conduct into the compressor body, and turn that red too! ...yooo feckin sure?

Quote:
Originally posted by Johnny Boat Dude
Yup once or twice on silly power cars

But the compressor body is pretty much always made of cast ali.

Cast iron, from memory, starts to glow 'cherry red' somewhere around 600C....you know where I'm going with this, don't you...

I concede that some heat transfer will occur, of course. But as a general rule, things are engineered (heat gaurds in both sides of the turbo behind the actual turbines etc), to keep things down to a sensible temp in the bearing housing, indeed, the paint is still on my boat turbos centre sections after 6 years (yes I know there not quite as extreme as the installations you're talking of), but hey.

So, some heat may find it's way across and 'influence' the charge air, but I reckon it's insignificant compared to the heat generated by the boosting pressure.

we'll have to agree to dissagree.
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