Gary:
The 5 main bearing crank is nodular cast iron and would probably be less
flexible than the 3 bearing crank both because of the extra bearings and
because of the material and manufacture. However the drop-forged crank
would have better shock resistance because the stress lines in the
forging follow the shape of the crank, a result of being formed from a
billet, rather than cast (but would flex more with fewer bearings). As
you suggest, this may be a trade-off?
Ron Tebo
GSTROM99@aol.com wrote:
>
> In a message dated 3/8/01 11:02:55 PM Central Standard Time,
> v.hughes@student.canberra.edu.au writes:
>
> > With 4 Cyl motors, those with 5 mains are (other things being similar)
> generally better able to cope with this than those with 3 mains.
>
> Isn't the 5 bearing crank cast? I think the 3 bearing forged crank may make
> up for the difference. What'd ya think?
>
> gary
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