RE: [DML] Re: R134 Freon @ $6.40 Per Can

["John Hervey" <john@xxxxxxxxxxxxxxxx>]

Tom, By the time you find and buy metal hose then make the bends that you
need and then make adaptors for each end you may spend more than you think.

I agree there is much difference on the book for the pressure but through my
experience of working with and selling hoses and AC stuff the old hoses seem
to burst normally with in 500 miles of converting from R12 to R134.
As cheap as I sell new Goodyear hoses and compressors I would always replace
the 30 year old used hoses for new ones. 
Naturally temperature outside has a lot to do with it along with cooling in
the condenser if your not using the more performance flowing ones like I do.

John Hervey
In the Hot Dallas climate 
As most of the US. 95+f


 
  

-----Original Message-----
From: dmcnews@xxxxxxxxxxxxxxx [mailto:dmcnews@xxxxxxxxxxxxxxx] On Behalf Of
Tom Niemczewski
Sent: Wednesday, July 18, 2012 4:54 PM
To: dmcnews@xxxxxxxxxxxxxxx
Subject: Re: [DML] Re: R134 Freon @ $6.40 Per Can

Does anyone know why we have such long hoses? Is there any particular reason

for this?
Since I have the body removed from the frame at the moment I'm thinking 
about installing metal lines running from the condenser and evaporator all 
the way back to the compressor and then use a short flexible hose to connect

to the compressor. Any thoughts?

BTW, the difference in pressure of R-12 versus R-134a is not that great. 
Here are some temp-pressure points of both:
Temperature (F) - R-12 (PSI) - R-134a (PSI)
0 - 9.2 - 6.5
50 - 46.7 - 45.3
100 - 117.2 - 123.6
150 - 234.6 - 261.4

At about 65 degrees F the pressures are the same and as temperature rises 
the pressure of R-134a gets higher over R-12. Is it really that big of a 
difference? At 150F it's less than 30PSI. R-12 will equal that pressure 15 
degrees later. In my opinion this is not a factor for the hoses, the 
compressor or cooling capacity.

Greetings from Poland!
Tom Niemczewski
Vin 6149 plus 2418, 3633, 5030, 16473, 17086
Google earth: 52°25'17.66"N, 21° 1'58.40"E



--------------------------------------------------
From: "jtrealtywebspannet" <jtrealty@xxxxxxxxxxxxx>
Sent: Wednesday, July 18, 2012 3:47 PM
To: <dmcnews@xxxxxxxxxxxxxxx>
Subject: [DML] Re: R134 Freon @ $6.40 Per Can

> All hoses, even new ones leak. The older they get the more they leak. And 
> since on a Delorean you have so much hose, as they get old they leak a 
> lot! Running -134 at higher pressures and hotter temperatures just hastens

> the process. The original hoses were never intended to last 30 years in 
> any case. Newer "barrier type" hoses have an internal core that is more 
> leakproof than the older type hoses. I agree that in replacing the hoses 
> there is always the chance you can do collateral damage but when the hose 
> does leak you have no choice. And the hoses WILL leak. I consider it PM 
> just as you would change cooling system hoses and belts BEFORE they go 
> bad. Anyone contemplating getting their "dead" A/C going should replace 
> the hoses because that is probably why there is no refrigerant in the 
> system!
> David Teitelbaum
 



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