Piston Seals

I think that there are better materials than Teflon. Some of the common beliefs about Teflon are not very accurate. The primary commercial use is chemical resistance. It is not strong, tough or heat resistant. If you heat it or burn it it releases deadly Florine gas. HDPE and Delrin (acetol) and other plastics specifically designed for use as a bearing will work better in many cases. If you use an aluminum alloy with a lot of copper and have a highly polished surface, you may be able to get away with not having any seals at all. I have seen model steam engines with no piston seals and spool valves are metal on metal as well.

Having the cylinder made of brass would make this even better since the parts would expand at a more similar rate with temperature changes. Also brass is a better bearing material.

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