Even with the drawings he still makes an appearance every now and thenYour CAD skills are impressive Sarah. It’s very kind of you to make the drawings available when they’re tweaked. I’m sure they’ll help keeping Mr Cockup away!
Hi Jason, the o-ring I was thinking of is BS1806 012, CS: 0.070, ID: 0.364, OD: 0.504If you are just running it for display there is little need for a piston ring if the fit is right, infact if you like an engine to tick over slowly then the reduced friction helps
If you know the BS number of the ring you have I'll let you know a suitable groove size for models which compresses the ring less than if it were under high pressure.
Thank you0.090" wide x 0.065" deep should do the job.
She looks great! Lovely job!The paintig has been completed and all the parts assembled with gaskets. I ran it on air again and it runs very well, even at slow speeds. Picture of my Progress are below.
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