DawgsledMazda
+1y
I did say in one of my above posts that the oiling of the cylinder comes from below. but without the pressure in the crankcase the oil never gets there.
the oil thats in the refrigerant in a normal A/C system would go thru the cylinder with the refrigerant and also in the the lower case with the refrigerant, and at pressure it would also sling all around and into the bottom side of the piston.
as I said earlier a few times, with a vacuum instead of pressure that oil doesnt get there, simple as that.
ask an A/C tech anything you like, if he hasnt installed a York or Sanden on a truck for air tank filling, then hes out of his league.
also, back when I took the test in 1982 it wasnt as easy as it is now. so that theory along with the rest have been shot down.
the oil does circulate just like I said doesnt it?? answer YES
if theres no pressure in the lower case, how does the upper cylinder get lubricated?? answer IT DOESNT
how does the front bearing get oil if you do the oil mod from the front of the case?? ansawer IT DOESNT
does a cylinder running at high heat with no oil scorch?? answer YES
so go ahead and mod YOUR compressor any way you like, ill keep doing mine the way I know how. its common sense, not rocket science.
sometimes people are too smart to understand something simple.
the York doenst have a sealed oil system, neither does the Sanden.
the oil goes thru with the refrigerant. even a halfwitted a/c tech will tell you that.
the piston rings on a York are not fully sealed, so refrigerant gets into the lower case and pressurizes it. dont think so? pull the plug out of one that has refrigerant in it and see.
most Sanden compressors have Teflon piston rings, as do GM DA6s and R4s, neither is worth its weight in dirt. GM for ya....
most modern engines have a crank pulley thats larger or close to a York in size, so overrevving is not really an issue unless you are putting one on a high revving 4 cylinder. most V-8s cant take that many RPMs
there is also something to be said for real world application of techniques. ive seen the technique of modding the oil hole from the front and not oiling the inlet ead to many burned up compressors.
but on the other hand, properly done ones, dont seem to burn up... hmmm wonder why??
23 years ago when I started doing a/c work, you may have thrown this out and I may have fell for it, but not now, not after so many years working on compressors, and then using them for air tanks for years also.
peace