Re: Hellwig tubular anti-sway bar
[Re: 5spdcuda]
#791752
09/03/10 07:20 PM
09/03/10 07:20 PM
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Joined: Oct 2005
Posts: 4,945 WI
Dcuda69
master
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master
Joined: Oct 2005
Posts: 4,945
WI
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Re: Hellwig tubular anti-sway bar
[Re: AndyF]
#791757
09/04/10 03:38 AM
09/04/10 03:38 AM
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Joined: Jan 2003
Posts: 27,468 So Cal
autoxcuda
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 27,468
So Cal
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Re: Hellwig tubular anti-sway bar
[Re: Kern Dog]
#791758
09/04/10 04:47 AM
09/04/10 04:47 AM
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Joined: Sep 2003
Posts: 1,168 Vancouver, WA
MoparMarq
super stock
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super stock
Joined: Sep 2003
Posts: 1,168
Vancouver, WA
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You got me interested in some college history.
The formula for torque for a rod of circular cross-section is 1/2*pi*stress*R(cubed). Where stress is the strength of the material the rod is made of. I used 80,000 psi for the calcs, but it doesn't matter. R is the radius of the rod. For a hollow rod, it is simply 1/2*pi*stress*(R(cubed)-r(cubed)). R is the outer radius, r is the inner radius.
A 7/8" diameter solid bar yields the same torque capability (876 foot-pounds, in this case) as a 1.25" bar with a .543 inner radius (1.086 inner diameter). Or stated another way, equal to a 1.25" hollow tube of wall thickness .082".
Interestingly, the hollow tube has a cross-section area of .3009 square inches. The solid bar has a cross-section area of .6013 square inches. Assuming the same length bars and ends (a bit of a stretch), the hollow bar would be almost 50% lighter.
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Re: Hellwig tubular anti-sway bar
[Re: AndyF]
#791764
10/11/10 04:53 AM
10/11/10 04:53 AM
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Joined: Jan 2003
Posts: 27,468 So Cal
autoxcuda
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 27,468
So Cal
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Quote:
I finally got the car back up in the air and did the install. The engine is out waiting for a new oil pan so it was a good time to install the new Hellwig anti-sway bar. I made my own end link spacers from 1 inch aluminum bar stock. The large diameter spacers will stiffen up the bar a little bit.
Andy how did you like the fit inside the K-member? I really tried and pushed to get it centered in there because I know a lot of K-members get crushed making it even tighter.
BTW are you getting one of those new Milodon SB Road Race baffled pans? I told Steve how your Charlies pan lost oil pressure just after you came back from PIR testing. I thought one was going up there.
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