>
> The tonal quality and the length of the ring is a dead giveaway.
heres the scoop.
standing the front end on the ground, and tapping it with a 16 oz. claw
hammer. a sharp ping is heard, and carries for 2-4 seconds, increasing
in pitch (to my tone deaf ear). of the two cranks tested, the crank that
was the victim of a thrown rod sounded duller.
for comparison, i hung and tapped, with the same hammer, 2 camshafts.
the sound was something along the lines of "thuck" with no ring or
carrying of the tone whatsoever.
>
> Once again, could these cranks be cast steel?
> Tom Wiencek, metalurgist et al?
these cranks can also be of a higher crade of casting material, but i'm
under the impression that iron based castings tend to be very grainy. all
of your steels are worked in some way while still hot, giving them the
uniform crystal stuctures that make them so strong. the term "cold
rolled" is even a misnomer. 1200 degrees is "colder" than 2200! hot
rolled is softer because it is closer to a casting in its grain stucture,
having been worked in a hotter state. cold rolled experiences something
closer to work hardening when it is formed
disclaimer
there are millions of variables beyond these i've just stated, and most i
know little of!
joe k
>
> Cheers, and of course, keep me informed.
>
> Jarrid
This archive was generated by hypermail 2b30 : Tue Sep 05 2000 - 09:56:13 CDT