Automotive Air Conditioning Information Forum (Archives)

Vanagon on Mon June 03, 2013 10:38 AM

Model: 1100

Hi,

I have a VW Vanagon that has been converted to R-134A, and isn't really cutting it. I've done an engine conversion on it with an I4 engine that's basically the same as a circa 1997 Golf/Jetta. I have a Sanden SD7V16, model 1100 compressor on it now, and wonder if anyone can tell me if it's R-12 compatible. It's just labeled as R-134A. The s/n is 1105803620, and it also has the #1HC820803D, and says "Oil: SP10". Any help appreciated.

Keith

ice-n-tropics on Wed June 05, 2013 4:28 PM

The relatively large displacement SD7V has a built in override to keep full stroke/displacement while the discharge pressure is high, therefore a monster condenser or gobs of condenser air mass flow or a smaller displacement compressor is required. An auxiliary condenser would need a electric fan.
hotrodac

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Isentropic Efficiency=Ratio of Theoretical Compression Energy/Actual Energy.
AMAZON.com: How To Air Condition Your Hot Rod

TRB on Wed June 05, 2013 4:40 PM

What would happen if you ran R12 in this compressor? I believe this poster was in the shop asking questions the other day. Already has a large PF condenser and Head pressure was real high. If I remember corre4ctly this Vanagon has a sub-frame blocking air flow. Poster even inquired about a second condenser lying flat with a fan. I have never had a lot of luck with condenser lying flat.

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When considering your next auto A/C purchase, please consider the site that supports you: ACkits.com
Contact: ACKits.com

ice-n-tropics on Thu June 06, 2013 9:09 AM

If A/C is converted to R12 properly, by removing SP10 lube and adding Sanden 5GS or DENSO mineral napthenic based mineral oil (not GM or other paraffinic mineral oil), compressor should be OK for chemical compatibility.
The suction pressure that causes the SD7V16 to de stroke would would change based on the temperature verses pressure characteristics of the 2 refrigerants.
hotrodac

-------------------------
Isentropic Efficiency=Ratio of Theoretical Compression Energy/Actual Energy.
AMAZON.com: How To Air Condition Your Hot Rod

Edited: Thu June 06, 2013 at 4:18 PM by ice-n-tropics

TRB on Thu June 06, 2013 10:22 AM

Quote
Originally posted by: ice-n-tropics
If A/C is converted to R12 properly, by removing SP10 lube and adding 5GS napthenic based mineral oil (not GM or other paraffinic mineral oil), compressor should be OK for chemical compatibility.

The suction pressure that causes the SD7V10 to de stroke would would change based on the temperature verses pressure characteristics of the 2 refrigerants.

hotrodac

That's what I was thinking but wanted to hear it from the Sanden expert.

Hope all is well and the fishing is good.


-------------------------
When considering your next auto A/C purchase, please consider the site that supports you: ACkits.com
Contact: ACKits.com

ice-n-tropics on Thu June 06, 2013 4:33 PM

Band of Brothers Leader,
Missed your barbecue and hotrods.
Raising fish but few keepers yet.
Sept.- Utah
Certified Texas naturalist (TP&W) and bob cat care giver.
hotrodac



-------------------------
Isentropic Efficiency=Ratio of Theoretical Compression Energy/Actual Energy.
AMAZON.com: How To Air Condition Your Hot Rod

Vanagon on Sun June 09, 2013 11:53 AM

Quote
Originally posted by: ice-n-tropics
Band of Brothers Leader,

Missed your barbecue and hotrods.

Raising fish but few keepers yet.

Sept.- Utah

Certified Texas naturalist (TP&W) and bob cat care giver.

hotrodac

OK, thanks guys. Yes, I was in the shop the other day. I was, however, able to source a PF condenser with a core size approximately 20% larger, making use of all the unobstructed airflow area. I'm also building a new evap cabinet (rear air only since it's a pop-top Vanagon) to split the dual cage fan air so that one side feeds a new duct running to the front of the van. If R-134A doesn't cut it with the larger condenser and revamped air flow, then I'll consider returning to R-12.

Thanks for the info - at least now I know what I need to do if/when the time comes. Stock, with R-12, the system was pathetic - way undersized for the van volume. I'm just looking to get to "somewhat lame", not looking for miracles.

Vanagon on Sun June 09, 2013 12:07 PM

Quote
Originally posted by: ice-n-tropics
If A/C is converted to R12 properly, by removing SP10 lube and adding Sanden 5GS or DENSO mineral napthenic based mineral oil (not GM or other paraffinic mineral oil), compressor should be OK for chemical compatibility.

The suction pressure that causes the SD7V16 to de stroke would would change based on the temperature verses pressure characteristics of the 2 refrigerants.

hotrodac

Looking back at my records, I actually drained the compressor switched over to POE oil when I changed out hoses, drier, and went to PF condenser and R-134A. The shop that did the engine conversion install and compressor swap initially charged with R-12. They botched the fittings twice, so only ran with R-12, and PAG I assume, for a couple of days (until charge was lost) until I decided to just fix it myself. It's had POE in it for several years now, so I assume it's compatible? Or am I looking at an impending problem? Thanks!