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This is a good time to ask a theoretical question. If I had a Viton ring on a piston, and shoved the piston half was down a length of cylinder, there would be no leakage at all past the Viton ring. A Viton ring seals perfectly around it's full circumference. If I stood the cylinder on end and filled the top half with Varsol or any other fluid, none of it would leak past the Viton ring---ever. That is a given. I have done that.---Now, if I take a piston with two cast iron rings on it, each ring having a 0.004" gap between the ends, and the gaps set at 180 degrees to each other, it will leak. If placed half way down a cylinder and stood on end, and if I fill the top half of the cylinder up with Varsol or some similar fluid and left overnight, some of the Varsol would leak past the rings and be puddled in the bottom half of the cylinder. Iron rings are not a perfect seal. ---Any comments???
Question Jo--When you make rings, do you machine the outside diameter of the rings after they have been heat treated?
WOO-HOOOO---I just got my second covid shot this morning. Wife and I drove to a nearby town and after they confirmed that we had our first shot in early march and that we were "essential caregivers" to my 100 year old mother they went ahead and injected both of us. Arm is not sore, no hives, no sick feeling (at least so far).