quote:I have to replace the compressor so I was wondering which was the best or a part # but as of now I have R-12 in my shop but i wanted to use a 134 unit.
If you have the R12, and since it is more efficient than 134, I would stay with an R12 system. The Sanden R12 unit that is used in the conversion is an SD508 style, model 8390. You can get the York to Sanden conversion brackets on eBay or at any parts store. These are universal and not just sold by our vendors.My rotary, otherwise stock system, blows 40 degrees on a 95 degree day here in Fresno, where we just finished a 31 day steak of over 100 every day.
I am using four pounds of freon.
Water pumps are a personnal choice, but they should have a plate added to the impellor if not there already for increased water flow. Quella sells a Weiand unit with this modification.
And again, make sure you have the Cleveland thermostat!! If not, you keep a major percentage of the flow inside the block (designed for quicker warmups and thus lower emmissions) instead of sending it to the radiator.
Larry