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Thanks for the help everyone. It seems that 3/4" is the most common small dia. To answer a few of the questions posed: - I can tolerate most piston crown forms, and the crown to gudgeon distances too. - I would like to use rings as I believe it will make machining to bore easier/cheaper for my...

Hi, have an engineering application (essential a high temperature plunger) and am looking for the smallest dia. commercially available piston and ring(s) that I can easily source. So far the smallest I have found is 1.25" (32mm) from 25cc 2-stroke garden products such as weed wackers and...