Posted by Texasmark1 on October 05, 2012 at 06:38:02 from (67.142.175.26):
In Reply to: Re: AC compresser posted by DH in Carolina on October 04, 2012 at 06:17:48:
As the driven wheel gets larger in diameter (circumference increases), it takes more circumference of the driving wheel to complete one rev. As the circumference of the driven wheel increases to twice that of the drive wheel, the drive wheel has to make 2 revs to get one for the driven wheel, thus you have a 2:1 reduction gear. Since the engine contains the drive wheel and it has to run at a certain rpm to perform it's intended function, the AC compressor will run slower than it did.
I understood that the new compressor had the 3 groove chev on it which increased from 4" dia to 6" and it is the driven wheel. Obviously, if the two chevs swapped positions, the result would be just the opposite and yes the compressor would be putting out 1/3 more refrigerant and you could be looking at potential evaporator freezing problems.
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