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

[farna@xxxxxxx]

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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