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Thread: solid vs. hollow
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03-29-2006 #1
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A few corrections & clarifications to Mr. Scott Mueller's write-up are in order.
First, the effect of the arm length on overall rate is not linear. It's partly an [arm length]^2 function (as lever arm length affects the torsion in the lateral center section) and partly an
[arm length]^3 function as regards bending of the arm itself.
Next, there are a few terms besides the arm bending that have been overlooked. Mostly, they are small enough to be neglected, though bending in the central torsional section does indeed occur (particularly with relatively thin front bars; in such instances this effect can reduce bar stiffness by 5% or more).
Once you start playing around with the length of the central torsional section, the other terms become more significant, although that effect is likely dwarfed by the change in control arm attachment (and the associated reduction in motion ratio).
This would make a rather neat problem for engineering students to derive a solution for by working through standard beam formulas.
Norm
'08 GT coupe, 5M, suspension unstockish (the occasional track toy)
'19 WRX, Turbo-H4/6M (the family sedan . . . seriously)
Gone but not forgotten dep't:
'01 Maxima 20AE 5M, '10 LGT 6M, '95 626, V6/5M; '79 Malibu, V8/4M-5M; '87 Maxima, V6/5M; '72 Pinto, I4/4M; '64 Dodge V8/3A
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03-29-2006 #2
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That was much more.... in depth than I was counting on! I took a look at the Hotchkis site and it does not say that their bars are heat treated, so that is a concern. But I think for my application is should do the trick.
Has anyone had idler arm rubbing issues with this thick of swaybar?
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