Stan Weiss wrote:
>
>
> As the article says the difference in the size of the parting is one
> way. If the crank is out of the engine and you hit it with a hammer the
> cast crank will make a thud and the forged crank will ring like a bell.

No that's not true. There are many different cast iron alloys. Gray iron
will have a dull thud when struck, but crankshafts are typically made
from ductile iron which will ring when struck. Ductile iron (depending
on the alloy) can actually have more of a ring than steel which makes
more of a clang type sound. Cast iron engine blocks OTOH are usually
made of gray iron and will make a dull sound when struck.

-jim

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