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 - The Day Mom Drove the 8N - by Brian Browning. My Dad was wanting to put in a garden but couldn't operate the 8N and handle the old horse drawn plow he had found and rigged up to use with the tractor. Well, he decided to go get Mom out of the house and have her drive the tractor while he walked behind the plow. You got to understand that while my Mom is a hard worker who will always help whenever she can... she had never operated farm machinery before that day. Dad got her out there, explained how the clutch was the same as in our o
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