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I believe that I can solve this problem by increasing the viscosity of the oil. That way the oil won't be fast enough from one piston compression to the next to fall into the piston cylinders and be pushed out. So I have done hours and hours of research and still am feeling uncertain about how best to thicken the PAG oil. My concerns are twofold. First, apart from the fact that PAG oil is a Polyalkylene Glycol I am not sure of its chemical composition. I know that it has adverse reactions to chlorine but because the formula for PAG oil is a trademark secret there isn't much information on its chemical makeup. So I am not sure what it will react well to or adversly to if I do add a thickener. Second, I am currently thinking of using grease as the thickener to increase the viscosity. The greases that I am looking at have bases of Lithium, Aluminum, Clay, Elastomer, Calcium Sulfonate, and Sodium. The greases that I am considering the most are listed below, but how do I evaluate the reactions between the grease and any of its additives and the PAG oil. Should I avoid the use of greases with additives and stick to some pure thickener like pure silicone oil (is it even sold in its pure form intended to be used as a thickener?)?
1) Multipurpose Synthetic Grease - Silica thickened - (-20 deg F to +400 deg F)
2) High Temperature Synthetic Grease with PTFE - silica thickened w/ PTFE additive - (-40 deg F to +450 deg F)
3) Extreme Pressure Grease - thickened with PTFE and with moly - (-33 deg F to +400 deg F)
Any advice would be greatly greatly appreciated and thoroughly considered. Thanks, back2theFuture