Your thoughts on Vacuum Pumps... - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat

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Old 07-28-2006, 05:15 AM   #11
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Originally Posted by BlownBuick
An oily mist would come out through the A/C compressor, but I would think that it would be enough oil to keep the compressor happy. I mean how much oil floats around in the A/C system? Maybe 16 oz. I think that should circulate around the system every couple of minutes. So, to keep the compressor lubed, it would need to draw 1/2 qt. of oil out of the crankcase every few minutes. Better bring a few extra gallon size jugs of oil to the strip.
i have yet to add a whole pound of PAG oil to an AC system...most are about 10 oz...and most of that just sits inside the accumulator/reciever-drier, condensor and evaporator.

as fer how much oil mist the compressor needs it doesnt require much but PAG oil is thicker for high heat...besides being a much better lubricant...but the beuty of this lowbuck Compressor vacum pump, is that it'* on a clutch a 1/2 qt of oil every few minutes would translate into about 8+ 1/4 runs before you needed to drain the oil catch tank/breathedr can.... and even then a properly designed system, this wouldnt be required (see my thread involving Ron V)

Oh BTW my idea is to actually use the variable displacment compressor to an advantage since at high rpm the displacment can be lowered to reduce drag, but still maintain max crankcase vacum...
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