[V8] Well, it's spring....
Bob.Korn at Fike.com
Sat Apr 19 17:54:27 PDT 2008
I switched my 90 to R134 using the kit from the local FLAPs for about
$40 and has worked perfectly for about 2 years.
From: v8-bounces at audifans.com [mailto:v8-bounces at audifans.com] On Behalf
Of Ingo Rautenberg
Sent: Saturday, April 19, 2008 3:39 PM
To: b.homburg at web.de
Cc: V8 Audi Fans
Subject: Re: [V8] Well, it's spring....
Interesting, Bastian, though I'm not sure about the R134a with respect
to the USA. My '93 (build date Feb 1993) came factory (including
well-worn sticker on top of radiator Core Support) equipped with R134a.
On Apr 19, 2008, at 4:04 PM, Bastian Homburg wrote:
> um....let me explain:
> The ABH (4.2) and PT (3.6) motor were assembled using different
> technology: With the small motor, they used some kind of etching
> process whereas the 4.2 used nikasil coated cylinder walls. And
> exactly this coating is washed off over time due to a chemical
> reaction with sulphur components found in gasoline. That is why most
> of the ABHs use lots of oil even when the rings are perfectly OK. This
> is worse in manual trans models, which are geared shorter and tend(ed)
> to be driven more aggressively.
> And only the very last V8s had R134a AC from the factory. All '92s as
> well as most of the '93s still were equipped with R12 - the switch to
> R134a was made around May 1993.
> Retrofitting the system (no matter if 'old' or 'new' control unit) to
> R134a is pretty easy. Audi sells a "retrofit kit" that includes
> everything you'd need (part no. 4A0298107A for the denso compressors
> in the 3.6 and
> for the Zexel compressors in the 4.2), plus there's even an official
> retrofit guide (see
> http://www.audiv8.com/forum/download.php?Number=92939 for a pdf
> version). Cost for this kit in Germany is 200 Euros.
> The refrigerant type should definitely not be a major point in
> deciding for or against a specific V8.
> Dave Saad wrote:
>> On the oil consumption issue, I think a lot of 3.6L motors had the
>> same problem. Mine sure did. It seems that the problem is the
>> design of the oil ring - it is just bad. I put new rings in mine and
>> oil consumption has gone down to a normal level. My plugs now are a
>> nice brown too instead of crusted black. I am not sure why some
>> motors seem OK while others are oil burners from the same model
>> years. maybe the factory used two different styles of ring during
>> On the other issues, the AC is probably the biggest to me. Having
>> the R134a would be nice just for the ease of servicing. The newer
>> control head would also be nice I suppose, but the old style works
>> well enough.
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