<VV> <Air-Vair> Re: new subject? A/C questions

[Greg Riley]

I have converted numerous early model systems to 134-A using the stock condenser with excellent results. The '61-5 large condenser are very forgiving.  I have had very poor results doing the same with stock '66-7 condenser. 
You do need to follow advice regarding flushing the system, replacing hoses, correct refrigerant oil, o-rings, crimping connections, replacing drier, and expansion valve for one calibrated for 134-A.  A small pressure controlled electric fan can be hidden under the condenser inside the stock condenser cowling. This is desirable if the car is likely to get caught in traffic. However, I still believe the best solution for ALL 'Vairs is a trunk condenser. This will perform better (if installed properly) and enhance engine life. 
In the final analysis R-12 is the best and most forgiving refrigerant I have ever used. 
Good luck,
Greg Riley 

To: virtualvairs at corvair.org; AirVair at yahoogroups.com
From: mikeamauro at aol.com
Date: Tue, 18 Nov 2008 23:41:18 -0500
Subject: <Air-Vair> Re: <VV> new subject?  A/C questions



















    
            


"...has anyone converted an early a/c system to R134a? is it worth 
the  hassle?..."
 
For a while, before changing my A6 out for a Sanden 
SD7, I ran my late model system converted to 134a; the system 
performed OK, but not as well as with R-12. For this to work, at the least 
you'll need to change the compressor oil. There are other concerns, and the 
following is a link to a Hemmings article containing some useful info. 

http://www.hemmings.com/hmn/stories/2006/10/01/hmn_feature32.html
 
And another with more detail: http://www.nichols.nu/tip306.htm
 
Also, I can tell you (drawing from my trade 
experience and education as an A/C contractor), if you really want your 
conversion to work the best it can: 1) change to barrier hoses with crimped 
connectors and 134a compatible O-Rings (the old hoses, internally soaked with 
mineral oil, will leak a little refg. through their walls (sorta' 
bad), but the OEM stainless clamp terminations just won't cut it at 
all with 134a refrigerant (134a leaks easier, as it has a much smaller molecule 
than does R-12); 2) 134a requires more condenser than does R-12... hence, you'll 
either need to increase the size of the condenser, or add an electric 
helper fan (or you'll develop little or no subcooling, and cooling performance 
will be poor in hot weather and/or at idle). My conversion dealt with a 67 coupe 
having the condenser across the back of the fire wall; hence, I was able to 
add two fans (this add helped system performance greatly, and was done in 
conjunction with change to the Sanden compressor and a 134a TXV; so, cannot 
comment on how just the fans would have helped with an A6 still in 
place) . On an early, I don't know how you would handle the condenser 
deficiency issue, and this may be a show stopper to getting an early system to 
work REALLY well with 134a.
 
Mike 
Mauro      



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