[urq] RE: Water Cooled Turbos

[QSHIPQ at aol.com]

In a message dated 2/14/01 12:31:30 AM Central Standard Time, 
Dave.Eaton at clear.net.nz writes:

> can't resist a smile at the inclusion of sae papers in this context, but i
>  digress....

Sometimes they can be a great resource, temps are a tough thing to fudge when 
propogandizing.  I love thermocouples, but they sure are expensive, and in 
the context of WJ turbos, it's not just audi that has published them.

>  
>  anyway, audi make the note in their paper on the v6tt that one of the 
issues
>  with water-cooled turbos is that the water will vapourise and can stop
>  coolant being drawn in by the after-run pump.  for this reason, the
>  after-run coolant flow is reversed (i.e. coolant is pushed to the turbos).
>  anyone know if the after-run pump "reverses" direction in the i5 20vt?

Yes, the I5 runs reverse as well, for the same reason.  The biggest problem I 
see with afterrun systems is that the delay on turn on usually misses the 
peak shutdown temps anyway.  

HTH
SJ