[V8] Well, it's spring....

[Korn, Bob]

I switched my 90 to R134 using the kit from the local FLAPs for about
$40 and has worked perfectly for about 2 years.  


BK

-----Original Message-----
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.

Ingo

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
> 4A0298107
> 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 
>> production?
>> 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.
>>
>> Dave
>>
>>
>
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