Water Cooled Turbos - should be water jacketed turbos

[Gary Erickson]

QSHIPQ at aol.com wrote:

> Ned has a great story from kkk regarding
> their insistance that *all* turbos are oil cooled).

Just to keep our facts straight, the story I've heard indicates that KKK
differentiates between air-cooled and water-cooled turbos; oil was there
for lubrication.

Reference Ned's email "What? Oil Cooled Turbos!" of 4 December 1997 at
<http://www.audifans.com/archives/1997/12/msg00633.html> also copied
below:

NR> About 4 years ago I was embarrassed when talking to some
NR> folks who work building our Audi turbos at KKK.  I made
NR> mention of the oiled cooled turbos on the ur quattro.
NR> 
NR> Their response was,  "ALL our turbos are LUBRICATED by oil.
NR> Some are air cooled and some are water cooled."
NR> 
NR> I had to readjust my thinking.  Now when I order turbos
NR> they are specified as either water cooled or air cooled.
NR> 
NR> Ned Ritchie

Not trying to bust you here; it just didn't jive with a memory fragment
floating around in my poor abused noggin.

FWIW, I do agree that the afterrun pump is not necessary with a proper
cool down.  I've been running my '89 200q without an afterrun pump for
six months prior to tearing down the head and swapping the
turbocharger.  (When it started leaking prodigiously on my honeymoon, it
got bypassed with a deepwell socket clamped into the hoses in it's
place.)

I've seen no change in cool down characteristics in that time, nor did I
see any signs of oil coking in the turbo or feed/drain lines when I
removed them.  This may be due to the fact that I've run Mobil-1 since I
bought the car 60K ago.

Which may be a sign that afterrun pumps may have been a necessary evil
in the days pre-synthetic oils, but may be successfully ignored today
with the careful choice of lubricants during routine maintenance.

My $0.02, almost guaranteed Your Mileage Will Vary.

later,

-Gary

'85 turbo GT coupe
'89 80q
'89 200q