Re: Turbo care

[PDQSHIP@aol.com]

In a message dated 96-10-29 18:15:09 EST, you write:

<< i think that you'd find that both these turbos are air-cooled, not water
cooled.
 the water cooled turbo for the ur-q was the 1988 2.2litre/hydralic cam motor
 upgrade if memory is correct....
 
 warming down is an absolute must after hard driving with a air-cooled turbo.
 
 -dave.
 '93 s2
 '90 ur-q >>
Maybe you are a little confused dave...  By water cooled and oil cooled, one
refers to the turbocharger bearing housing....  The two theories are:  WC =
coolant is flowed thru the bearing housing, oil still is the bearing shaft
"carrier" but the heat sink is no longer the oil, it is the coolant  2)  OC =
Oil cooled which means the heat sink is the oil, and in fact, is a misnomer,
cuz unless you add a accusump, ALL TURBOS, by definition, are oil cooled....
 However, the older cars use oil only as the heat sink, which creates big
prollums when the turbo is hot and shut down...   All audis since 1985 have
Water cooled turbo bearing housings, and as of 1986 all audi turbos have the
afterrun water pump for the turbocharger.....  This corresponded with the
running change to a single oil filter from 1986>, prior to that all audi
turbos had 2 oil filters, one for the turbo only.....  There is no such thing
as an "air cooled" turbo, that is, by definition, an oil cooled turbo,
otherwise it is indeed not a turbo...

HTH

Scott