its all about the math when file fitting rings you must allow clearance in tight part of the cylinder wall . this is so that if ring heats up and expands it does not stick in the bore . minimum clearance is about.0045" per inch of bore or about .020 on a 4" bore . now if the cylinders have .010 taper to them your ring end gap will be about .050" at the top of the bore where the most leakage will occur if the bore is wore .015" the ring gap will be about .070" .kinda hard to keep the air on the top side of the piston .
If one uses gapless or two rings instead of one you might get by longer but that ring is going to act like a piece of wire that got bent one too many times eventually.Paul
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Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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