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Old 09-08-2010, 12:12 PM
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Need Help, Suspension

I've built a 1933 3 window coupe, with a Supercharged 383. The front suspension is a M2 copy. I do not like the sway bar set up, and since I own a machine shop would like to build my own for both front and rear(rear is a modified C4 Vette). BUT, what type of material does a sway bar use ?..as in 10 series carbon steel, 4340, spring steel ? Would a torsion bar from an older Plymouth or Doge work ? Any help or ideas would be appreciated !

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Old 09-09-2010, 03:12 PM
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Bump !

Just to bump my question about the type of material a sway bar is made of ?

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Old 09-09-2010, 05:20 PM
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Save yourself a bit of work and look at the torsion bars and parts for sprint cars from Speedway motors..you can get the bars and arms as well as the mounting tubes and bushings needed and use those with minimal machining on your part. The bars come in varying degrees of stifness so you can arrive at the sway bar stiffness desired..

Sam
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Old 09-10-2010, 08:09 AM
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Thanks

Thanks for the suggestion, I have bought a lot of goodies from Speedway over the years,just never looked in the midget-sprint catalog. I'm piecing together an order now.

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Adobe Machine
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Old 09-11-2010, 08:43 AM
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I have built many custom anti-roll bars out of seamless 4130 tubing. After fabrication I have them heat treated to Rockwell C34 to C38.

Andy
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Old 09-13-2010, 01:42 PM
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THANKS again

I ordered 2 of the 1 1/8 inch Torsion Bars from Speedy Bill. I have some annealed 4340 solid barstock, and a small heat treat oven. After machining for a press fit,then heat treat.I will install and TIG.

There seems to be a lot of discussion on the web about the correct procedure for welding this alloy: I have always preheated, then TIG'd, then post heat to - 550-600 degrees then let air cool to ambient ...Any comments from some of the Welders in this group ? I was in a race shop the other day and they were using a MIG ( building a roll cage for an alcohol funny)I was under the impression that most if not all of the sanctioning bodies ( NHRA ect) said that the roll cages had to be TIG'd?
The welder assured me that they have never had a problem with inspection or a cage coming apart. I will say the welder was doing a nice job stacking dimes,so maybe the inspectors thought the cages were TIG'd.? Thats what happens when you get old and do not participate anymore..you foget, lose track and a lot of other stuff too.

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Adobe Machine
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Old 09-13-2010, 05:02 PM
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Adobe,
Sounds like you do know what you are doing..About the cage deal that can start a barfight over fabbing cages and chassis from 4130..Lots of opinions on that..

Sam
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