Re: Interesting torsion bar discovery...
[Re: DrCharles]
#2566353
10/19/18 09:57 AM
10/19/18 09:57 AM
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Joined: Apr 2006
Posts: 4,220 West Plains, MO
DrCharles
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West Plains, MO
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Thanks Jim, you are right. They are both 892, and they are definitely offset differently. It's not hard to correct, just expensive (as usual with our Mopars!) Just want to know if I can run it that way until the budget allows for a new pair. Edited to add: I mean the 892's have an offset, obviously they're not different from each other
Last edited by DrCharles; 10/19/18 08:46 PM.
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Re: Interesting torsion bar discovery...
[Re: AndyF]
#2567041
10/20/18 08:21 PM
10/20/18 08:21 PM
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Joined: Mar 2003
Posts: 18,678 Fresno, CA
Jim_Lusk
I Live Here
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I Live Here
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Posts: 18,678
Fresno, CA
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i always thought that after a certain size, both bars were the same part number ? i don't know ? That is true but it happens at a bigger size than 0.920 which is what the OP has. OP has .870" bars. Not likely to snap one unless it's damaged already.
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Re: Interesting torsion bar discovery...
[Re: DrCharles]
#2567323
10/21/18 03:07 PM
10/21/18 03:07 PM
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Joined: Apr 2006
Posts: 4,220 West Plains, MO
DrCharles
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Thanks for the update, everyone. If I do buy a new pair, what would you recommend? .92 or even larger? I know 1.03 are available but those seem awfully stiff Mostly street, occasional strip. Forget the 90/10 shocks, I think those would be really weird to drive on the street. I'm not planning to go autocrossing, and soon will be installing homemade (2x3 box tubing) welded frame connectors. The big-block A-body is already nose heavy and I eliminated the back seat which probably makes the weight distribution slightly worse.
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Re: Interesting torsion bar discovery...
[Re: DrCharles]
#2567525
10/21/18 11:10 PM
10/21/18 11:10 PM
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Joined: Feb 2010
Posts: 18,493 Granite Bay CA
Kern Dog
Striving for excellence
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Striving for excellence
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Granite Bay CA
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People that are concerned that a 1 inch torsion bar will be too stiff have never driven or been in a car that had them. My 70 Charger has 1.15 bars and rides about as firm as our 2015 Challenger R/T. The torsion bars and leaf springs need to be complimented by the right shocks though. For many years, I had 1 inch T bars and KYB shocks. Now, The car actually rides better and has more control now with bigger T bars and Bilstein shocks. A 383 or 440 A-body needs more spring rate than a 318-340 car. Mopar had soft spring rates back then. Bigger torsion bars are just a part of bringing the ride and handling quality up to modern standards.
Last edited by Frankenduster; 10/21/18 11:11 PM.
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Re: Interesting torsion bar discovery...
[Re: DrCharles]
#2567531
10/21/18 11:16 PM
10/21/18 11:16 PM
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Joined: Apr 2006
Posts: 4,220 West Plains, MO
DrCharles
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Thanks Firm Feel makes a 1 inch bar... PST has 1.03" for an attractive price, but it is not clocked (front and rear hex are not offset) and many people have said their A-body's ride height is too low even with the adjusters all the way in The B-body has a longer bar than an A-body, so I'm not sure exactly what a 1.15" bar would translate to for my car. As with everything else street/strip, it'll be a compromise. I was thinking about .92 bars because I do want some weight transfer on launch. I wonder how much a 1.00 bar would hurt 60' times?
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Re: Interesting torsion bar discovery...
[Re: DrCharles]
#2567651
10/22/18 02:25 AM
10/22/18 02:25 AM
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Joined: Feb 2010
Posts: 18,493 Granite Bay CA
Kern Dog
Striving for excellence
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Striving for excellence
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Granite Bay CA
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Thanks The B-body has a longer bar than an A-body, so I'm not sure exactly what a 1.15" bar would translate to for my car. Well, the B body LCA is actually about 1/2" shorter than the A-body cars so the leverage is slightly less. An A-body with a 37" bar at 1.0" may not be much different than a B-body with the 41" bar.
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Re: Interesting torsion bar discovery...
[Re: Kern Dog]
#2567655
10/22/18 02:35 AM
10/22/18 02:35 AM
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Joined: Dec 2010
Posts: 12,375 SoCal
MuuMuu101
I got lucky at Woodward!
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I got lucky at Woodward!
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Posts: 12,375
SoCal
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Thanks The B-body has a longer bar than an A-body, so I'm not sure exactly what a 1.15" bar would translate to for my car. Well, the B body LCA is actually about 1/2" shorter than the A-body cars so the leverage is slightly less. An A-body with a 37" bar at 1.0" may not be much different than a B-body with the 41" bar. The B body bar will have about 10% more twist in the torsion bar for the same diameter, material property, and torque. phi = 32*L*T/(G*pi*D^4) phi: angle of twist L: Length of bar T: Applied Torque pi: 3.14... G: Shear Modulus of Rigidity D: Diameter of Bar https://www.engineeringtoolbox.com/torsion-shafts-d_947.html
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