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I think she gave up on this thread early on as she could not follow the imperial dimensions being talked about.
If an edge of the combustion chamber overlaps the bore you theoretically have very little clearance above to piston crown. On the Seagull I relieved the combustion chambers. The last two sections here http://www.charleslamont.me.uk/Seagull/cylinder_head.html explain.
Sorry about the imperial measurements Jo, too bad you cannot follow them.
How does the Corian stand up to heat? Mike's engine has the plugs quite close to the exhaust manifold and his engine will be in a confined space with little air flow. Corian is quite easy to thermo-form and I have had quite a few counter tops made by Corian fabricators who heat form it as well as doing small bits myself and you don't need that high a temperature to get it soft.
Interesting So how does a spark plug with a Corian insulator survive the heat of the combustion chamber?
Quote from: Vixen on July 17, 2020, 03:03:13 PMInteresting So how does a spark plug with a Corian insulator survive the heat of the combustion chamber? Think of it like boiling water in a paper cup over an open flame and the paper not catching alight Jo
Corian is generally said to be heat resistant to 100degC but can be damaged by putting a hot pan or curling tongs on it, always tell customers not to put pans on Corian worktops. Only needs about 150 deg C to get it pliable enough to thermo form easily but go too hot and it starts to blister.