I'm trying to improve the performance of the water pump in my steam powered cycle. It consists opf a 7/16" aluminum piston witrh 2 O rings at the end operating in a bronze cylinder. I'm using a clearence of .001" between the piston and cylinder. The dimension of the rings is 7/16 od X 5/16 id X 1/16 thick. I've been having leakage problems and have tried O ring grooves that had a square cross section a d half round. I'm looking for info on the best shape and tolerance for the grooves. I can't seem to find anything in Machinery's handbook. Engineman
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