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Compressor Operating Temperature?

mthomas58 on Tue May 13, 2008 1:54 PM User is offline

Year: 1987
Make: Porsche
Model: 911
Engine Size: 3.2
Refrigerant Type: 134a
Ambient Temp: 86
Pressure Low: 20
Pressure High: 235
Country of Origin: United States

Just completed the install of all new A/C components and converted to 134a. Two addl fan assisted condensers added to stock config along with a RennAire ProCooler (refrigerated drier). The ProCooler/subcooler is located in the suction line between the evap and the compressor which will ultimately increase the return temps to the compressor. Is there any concern over the compressor running too hot? Is there an acceptable operating temp range for the compressor? The ProCooler located in the front fender is ice cold to the touch and sweating. Suction line at the compressor was not cold during charging but I suspect it is cold running at higher RPMs (I will check) Update: Its barely cool to the touch.

Charged system using the P&T charts with small cans this past weekend. I estimate that my final was 38 oz vs 47.2 oz R-12 OEM capacity prior to system mods. Getting vent temps in the low 30's - quite pleased.


Edited: Wed May 14, 2008 at 5:43 AM by mthomas58

mthomas58 on Tue May 13, 2008 2:56 PM User is offline

This site says that compressors may run at 250 degrees.

http://www.climatictesting.com/Automotive%20AC%20System%20Test%20Stands.htm

Edited: Tue May 13, 2008 at 2:56 PM by mthomas58

mk378 on Tue May 13, 2008 3:31 PM User is offline

I always wonder if those things buy any performance. When you increase the temperature of the gas entering the compressor, the gas is less dense so you get less mass flow for a given compressor displacement. Also the only cooling the compressor gets is from the cool gas entering it.

mthomas58 on Tue May 13, 2008 4:01 PM User is offline

Quote
Originally posted by: mk378
I always wonder if those things buy any performance. When you increase the temperature of the gas entering the compressor, the gas is less dense so you get less mass flow for a given compressor displacement. Also the only cooling the compressor gets is from the cool gas entering it.

On systems designed with adequately sized condenser(s) and evaporators with good RAM air flow a subcooler is probably not necessary. Based on the poor design of the older 911 A/C systems, every little bit helps

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