Message text written by INTERNET:AVALON2455@aol.com
>My only thought on this message....is that.......if the guide expands with
heat.....it expands in both directions......so the od gets bigger and the
id
gets smaller......plus.....somewhere in the equation....if the od is
prevented or slowed from getting larger....by something like an engine
block,
that is expanding at a different rate if it is of different
material......would that force the id to get even smaller???????
<
Exactly. Actually, in an unrestrained guide the ID would get bigger but
more importantly the wall thickness gets bigger and when the extra wall
thickness is compressed into the not-that-much-bigger hole in the head the
ID doesn't get as big as it would like. And this is why a valve stem will
bind event though it expands at a slower rate than the guide (on paper at
least).
Dave
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