Re: AMC Pistons; Forged have downsides too , Cast has advantages ...
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Re: AMC Pistons; Forged have downsides too , Cast has advantages ...



I still don't have the street address or phone number to call the people for the truck.

I'm checking.

Joe
----- Original Message ----- From: <farna@xxxxxxx>
To: <mail@xxxxxxxxxxxx>
Sent: Friday, September 24, 2004 8:34 AM
Subject: Re: AMC Pistons; Forged have downsides too , Cast has advantages ...



Andrew, those cranks were still CAST steel, not forged though. Forged retains a lot more strength due to hammering the grain structure of the steel more densely.


On September 24, 2004 andrew hay wrote:


that's the way it is -now-, but i don't think it was always true.  in
particular, i think it was some development in mass production casting
that made iron cranks practical in the '60s.  remember, molten steel
is much more 'runny' than iron.  that would make casting an odd shape
like a crank much easier.

blocks are easier; you can make a block plenty heavy to cope with
less-than-perfect casting.  you can't make a crank heavier; the stress
would get -worse-.

mopar wouldn't have designed their famous slant six with a steel
crank if they didn't have to - and they spent the money to convert it
to cast in the '70s, which involved bigger main journals.  and the
chevy 194 and 230 had a steel crank but the 250 didn't.
________________________________________________________________________
Andrew Hay                                  the genius nature
internet rambler                            is to see what all have seen

adh@xxxxxxxxxxxxxxxxx and think what none thought


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