metal expansion (was: How tight should a spark plug be?)

["John F Sandhoff" <sandhoff@csus.edu>]

Mike points out:
> Actually that Q was used in a trivia contest. The answer is no, it gets
> bigger.

after I said:
> I'm not a machinist, but if aluminum expands, won't such expansion
> actually squeeze the hole smaller..?

Okay, I can see that now.. as the metal expands 'around' the hole, it
will push against itself and have to expand the opening. Hey, I _said_
I wasn't a machinist :-)

-- John
     John F Sandhoff   sandhoff@csus.edu   Sacramento, CA