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

[Ingo Rautenberg]

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
>>
>>
>
> _______________________________________________
> Audifans V8 mailing list
> Send posts to: mailto:V8 at audifans.com
> Manage your list connection: http://www.audifans.com/mailman/ 
> listinfo/v8
>
> You can help keep the audifans site running by shopping at http:// 
> audifans.com/shop/
>