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Re: ladderbar/anti roll bar ?
[Re: moparx]
#1239884
05/26/12 11:17 AM
05/26/12 11:17 AM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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If the bars or SOME points are flexing the anti roll will help but if its all beefy enough you shouldnt need it 
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Re: ladderbar/anti roll bar ?
[Re: moparx]
#1239886
05/26/12 03:13 PM
05/26/12 03:13 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
thanks guys ! my point for this ? was because i was adding a couple of bracing tubes to the chassis of my humpback and i thought it would be a good time to incorporate the mounts for a bar in case it is needed in the future. lots easier to fab stuff on the bench than laying under the car. doesn't "gregs dart" run an antiroll bar with a ladderbar setup? [63-4 red dart]
Yes he does run one
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Re: ladderbar/anti roll bar ?
[Re: moparx]
#1239888
05/27/12 08:34 AM
05/27/12 08:34 AM
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Joined: Jan 2003
Posts: 10,155
Frostbitefalls MN (Rocky&Bullw...
gregsdart
I Live Here
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I Live Here
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Posts: 10,155
Frostbitefalls MN (Rocky&Bullw...
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I have no clue where the info that an anti roll isn't used (or is only for four links) on a ladderbar car, but it is dead flat wrong. I picked up a solid .02 in the sixty foots and really increased consistency with my home built unit. It is all about how much you are pushing the combo. Unless you can dead hook in a rain storm it should show some improvement, form very little in an over tired car to a lot in one with lots of torque off the line like mine.
In the first build I used a mild steel tube of 1.25 diameter and .125 thick . I bent that on the first pass. Guess you might say it had a little roll rotation in it! I moved up to a 1 3/4 by .134 and that is holding. I will post pics.
As far as the lengths of the links go, it is all about packaging and arc created during suspension travel. Too short and the stresses will get too high on the parts. I think mine are seven inches long.
If you look at the left side, you can see it is about 3/4 inch off the surface. Nice twist for one pass.
Last edited by gregsdart; 05/27/12 08:44 AM.
8.582, 160.18 mph best, 2905 lbs 549, indy 572-13, alky
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Re: ladderbar/anti roll bar ?
[Re: moparx]
#1239893
05/27/12 09:25 AM
05/27/12 09:25 AM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
i'm guessing a guy could use a smaller diameter bar if using a kit with a 4130 tube vs. a home fabbed bar of .134 ms. tube ? what about pivots - bushings or bearings ?
Those are bushings... I have made oilite bushings
before... the original bushings have lasted years
in my car... in those kits the torsion bar is solid
with splined ends...not a piece of tubing
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Re: ladderbar/anti roll bar ?
[Re: Evil Spirit]
#1239896
05/27/12 09:59 AM
05/27/12 09:59 AM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
I think I would rather use a "commercial" bar that has been properly tempered than a piece of tubing that would be prone to crack from the flex. I would think a piece of tubing would just keep twisting, where a true torsion bar would keep returning to it's original location. 
Yeah the S&W is a true torsion bar(solid) with splined
ends.... on a ladder bar set up it most likely wouldnt
need to be as strong because its just covering up
flex in the ladder bar system but in a 4-link it has
a MAJOR job to do... some serious poundage is applied
to it
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Re: ladderbar/anti roll bar ?
[Re: Evil Spirit]
#1239898
05/28/12 12:45 AM
05/28/12 12:45 AM
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Joined: Jan 2003
Posts: 10,155
Frostbitefalls MN (Rocky&Bullw...
gregsdart
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 10,155
Frostbitefalls MN (Rocky&Bullw...
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Quote:
I think I would rather use a "commercial" bar that has been properly tempered than a piece of tubing that would be prone to crack from the flex. I would think a piece of tubing would just keep twisting, where a true torsion bar would keep returning to it's original location.
True, unless you go so big it doesn't come close to being stressed to its limit. thats why that spare piece of 1 3/4 looked so good at the time,,,,er was it the fact that I had it? At any rate, it works, and hasn't deformed at all.
There are some folks on here that have the formula for how much increase in diameter equals how much increase in torsional strength. It goes something like the old tube cubed Vs the new one cubed? If that is it, then ad 20 percent for extra thickness,,,,If the cubed rate is correct then I increased the torsional strength by 330 percent going from the 1.25 x .125 to the 1.75 x .134 wall tube.
Last edited by gregsdart; 05/28/12 01:00 AM.
8.582, 160.18 mph best, 2905 lbs 549, indy 572-13, alky
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Re: ladderbar/anti roll bar ?
[Re: gregsdart]
#1239900
05/28/12 09:17 AM
05/28/12 09:17 AM
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Joined: Jan 2005
Posts: 3,699
Newport, Mi
Evil Spirit
master
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master
Joined: Jan 2005
Posts: 3,699
Newport, Mi
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I just kinda agree with Raff's statement - " on a ladder bar set up it most likely wouldnt need to be as strong because its just covering up flex in the ladder bar system". I've always tried to fix the root of the problem - if the car doesn't leave straight - adjust the ladder bars. If the ladder bars are flexing - fix the ladder bars. We just haven't found a need yet for a torsion bar setup on a ladder bar car. Installed about a half dozen on Mustangs with "stock" style suspensions, but no ladder bar cars.
Free advice and worth every penny...
Factory trained Slinky rewinder.........
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for the sunday crowd
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