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: 4,942 WI
Dcuda69
master
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master
Joined: Oct 2005
Posts: 4,942
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: 27,465 So Cal
autoxcuda
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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: 27,465 So Cal
autoxcuda
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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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Re: Hellwig tubular anti-sway bar
[Re: VanishPt]
#791771
11/04/10 12:56 PM
11/04/10 12:56 PM
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Joined: Jan 2003
Posts: 27,465 So Cal
autoxcuda
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Quote:
Andy, IF you had to mount the bar 1.5" lower( on the bottom of the Kframe instead of through it)-using 1.5" square tubing instead of the flat 1/4" plate supplied--- do you see any drawback? I do not think ground clarance would be an issue as my oil pan is the low point. It does look like it would interfrere with the "Jacking" point on the bottom of the k frame.
Do you have a 67-72 style biscuit motor mount K-member? Then, Hellwig makes a tubular front sway bar for that application. And it has very stout and nice front K-member brackets.
If you have high backspace front rims, Hellwig also has a 67-72 sway bar that has bent in arms for rim clearance. They may make all their 67-72 sway bars like that now.
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Re: Hellwig tubular anti-sway bar
[Re: VanishPt]
#791775
11/05/10 02:33 AM
11/05/10 02:33 AM
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Joined: Jan 2003
Posts: 27,465 So Cal
autoxcuda
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Quote:
the area in the middle of the k frame has a bar welded through for support. Years ago I sliced and diced the kframe for an oil apn.
Where? Here's a 73-76 V-8 K-frame.
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Re: Hellwig tubular anti-sway bar
[Re: AndyF]
#791776
11/05/10 02:39 AM
11/05/10 02:39 AM
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Joined: Jan 2003
Posts: 27,465 So Cal
autoxcuda
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