"Morgans" wrote in
:


"Bertie the Bunyip" wrote

Yes, some air cooled engines have tapered bores (when cold) to allow
for different rates of expansion in cylinder base-to-head so that
it's perfectly cylindrical when up to temp, but i don't know of any
aircraft engines that have that feature.

Really? I thought that they did have a tighter bore at the top. I
guess I read wrong, or remember wrong.

Maybe. I didn't know that they did. It would make sense if they did, all
right. I don't do machining. I just run my fingers over the pretty parts
when they come out of the machine shop!

Bertie