Office of Steam Forum for Model & Toy Steam Gas & Hot Air Engines
The Regular Stuff: Chat, Buy, Sell, Off Topic, etc. => General Discussion - Scale Model Gas Engines - Hit & Miss - Throttle Governed - Non-Compression – etc => Topic started by: rodnoc on March 08, 2022, 05:35:41 pm
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Basically, whichever engine you have, look at the piston diameter, and source the green o rings with a 1mm cross section. Example: your engine has a 15mm bore, you want a 14x15 (or 15x1, depending on vendor listing) o ring. I did exactly this for the vertical hit and miss m93 engine, when they were selling rings for ridiculous prices, and got like ten of them shipped for two dollars. Yes China, but they’re utterly dirt cheap from hydraulics or food handling outfits that use them in equipment as connector seals.
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Piston o-rings used in the various Microcosm internal combustion engines are really tiny! Other than a dealer in China, is there a source in the U.S. for this micro stuff?
Is there a chart available anywhere showing ring size and cross compatibility between the growing selection of engine models?
Fuel and cooling system tubing is another challenge. Local RC hobby shops don't stock the different Microcosm sizes.