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Before I start work on another engine I have a general question. Some engine plans require a piston with close tolerances in a cylinder, maybe even lapping. Other plans describe a less close piston with piston rings. Why couldn't I use piston rings for every engine (except low power Stirling)?

I have a Gingery lathe I built many years ago and I have been able to do pretty accurate work including boring. In order to make things a little easier I have been trying to (for the first time) use a reamer to finsh bored holes. I believe that I am doing everything the way the textbooks...