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

[Scott Simmons]

I might be putting on a new compressor this summer (currently clutch is 
toast, can't seem to find clutches by themselves) and was talking to one 
of my mechanics about the pro's and con's of converting.

He can find R12 substitutes for around the same price as (rising) R134a 
... $10/can.  For that rate, I'll just change the accumulator, orifice 
tube, compressor, flush the system, and fill with R12 substitute.

~Scott S.

Korn, Bob wrote:

>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
>>>      
>>>
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>  
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>>>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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>>    
>>
>
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