re: Water Cooled Turbo

["Matt Martinsen" <mattmartinsen@hotmail.com>]

>At 21:09 99-03-08 GMT, Eyvind Spangen wrote:
>But won't the water almost explode due to the extreme heat in the
>turbo after some hard driving?
> 
>Take note that because the turbo is constantly cooled with water 
>during
>driving, it never gets "extremely" hot. You won't see a water-cooled 
>turbo
>glow white or even red. At least my 5KT hasn't exploded yet ;-) even 
>though
>.Aleksander MierzwaWarsaw, Poland
>mailto:alex@matrix.pl87 Audi 5000CS turbo (mine)
>88 Renault Medallion wagon (mom's)
>91 mountain bike (just in case both cars break at the same time :-)

The exhaust side of the turbo will glow regardless of water cooling.  
(after some hard driving at night, pop the hood and bask in the 
red/orange glow off the hot side of the turbo and downpipe including 
where the O2 sensor plugs in) This is normal, it's a good reminder why 
it's a good idea to let your car idle down a bit after driving.  Water 
cooling only affects the bearing section.  I've been meaning to measure 
the actual surface temp of the turbo, I'll post the results.
The turbo on my 86 5KTQ glows, the turbo on my brother's 91 200Q glows, 
and the turbo on my friends Volvo C70 glows.  Normal.
-Matt Martinsen
Seattle, WA
I forget where I read about NASAs work with airfoil bearings for turbos 
that need _no oil_!  No cool down period, no need to plumb water or oil 
lines.  Big problem is price, industrial apps first, maybe trickling 
down to cars eventually.   
Get Your Private, Free Email at http://www.hotmail.com