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#183099 - 01/03/09 07:32 PM WHAT TORSION BARS TO RUN
moparbud Offline
member

Registered: 11/22/08
Posts: 119
Loc: mo
can any one tell me what torsion bars to buy for my 68 roadrunner drag car i have ladder bar rear and are mopar performance ok summit has .920/.960


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4921335-68roadrunner004.jpg (80 downloads)


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#183100 - 01/03/09 07:44 PM Re: WHAT TORSION BARS TO RUN [Re: moparbud]
Mike Swann Offline
mopar addict

Registered: 02/24/04
Posts: 1079
Loc: Long Beach, CA
To me it really depends on the power. If you have a lot, most guys limit the downward travel to keep the front end down. real "springy" torsion bars for for lower powered applications were the car needs help getting the weight transfer on the back tire. Another issue is a lot of street use and potential oil pan damage. Looks like you have a big block in a B body, this usually works good. I would stay with the 0.960 IMO.
_________________________
8.30's @3400 lbs

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#183101 - 01/03/09 07:51 PM Re: WHAT TORSION BARS TO RUN [Re: moparbud]
blownzoom440 Offline


Registered: 07/10/05
Posts: 8647
Loc: ELYRIA,OH
i am wondering what spring rate you have on the4 back?
another place to buy torsion bars is P-S-T.com
performane suspension technology montville NJ 07045 800-247-2288

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#183102 - 01/04/09 10:04 AM Re: WHAT TORSION BARS TO RUN [Re: blownzoom440]
moparbud Offline
member

Registered: 11/22/08
Posts: 119
Loc: mo
i am not sure what spring rate is on the rear. this is my first ladder bar car. and trying to learn it all. thanks guys for your help. any info or advice is greatly appreciated.


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4922415-68roadrunner006.jpg (88 downloads)


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#183103 - 01/04/09 10:26 AM Re: WHAT TORSION BARS TO RUN [Re: moparbud]
blownzoom440 Offline


Registered: 07/10/05
Posts: 8647
Loc: ELYRIA,OH
not sure if you can read the chart on the bars rating#.


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4922465-100_1787.jpg (91 downloads)


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#183104 - 01/04/09 04:31 PM Re: WHAT TORSION BARS TO RUN [Re: moparbud]
Anonymous
Unregistered


Quote:

i am not sure what spring rate is on the rear. this is my first ladder bar car. and trying to learn it all. thanks guys for your help. any info or advice is greatly appreciated.




Here's a great Web site to learn............Billy recommends having the stiffest bar in the right front and the weakest bar in the left front to get equal tire loading........

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#183105 - 01/05/09 06:09 AM Re: WHAT TORSION BARS TO RUN
moparbud Offline
member

Registered: 11/22/08
Posts: 119
Loc: mo
i was told to run the torsion bars the same on both sides. with a ladder bar car. but maybe not. thanks for your help guys


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4924589-68roadrunner006.jpg (65 downloads)


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#183106 - 01/05/09 01:45 PM Re: WHAT TORSION BARS TO RUN [Re: moparbud]
blownzoom440 Offline


Registered: 07/10/05
Posts: 8647
Loc: ELYRIA,OH
i would noy run 2 different bars.do you have any bars in it now?
are the LCA modefied?
i run 1" bars in mine but i have a lot more weight than you up front it looks like. do you know how fast you intend on going?wheely bars?

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#183107 - 01/05/09 04:35 PM Re: WHAT TORSION BARS TO RUN [Re: moparbud]
Sport440 Offline
master

Registered: 01/20/03
Posts: 5933
Loc: Canton, Ohio
I would run the 440/hemi resto bars .920 I think the .960 bars will be to stiff for your lightened front end mike

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#183108 - 01/05/09 05:46 PM Re: WHAT TORSION BARS TO RUN [Re: Sport440]
Troy Offline
"Nice Guy"

Registered: 12/02/03
Posts: 3889
Loc: West Coast, CA
"Stored Energy" is what your looking for and a .920 bar will not do it. You want the newest and the smallest bar you can get your hands on. In a perfect world you want the bar turned all the way up just so the body is just off the bump stops (and that is with the bump stops shaved down to less than an inch thick) You can always control compression and expansion with the shock and limiters.

Just my opinion.
_________________________
....there is nothing like driving my 1968 Hemi Dart around town and having people looking at you like you're nuts!!

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#183109 - 01/05/09 05:57 PM Re: WHAT TORSION BARS TO RUN [Re: Troy]
blownzoom440 Offline


Registered: 07/10/05
Posts: 8647
Loc: ELYRIA,OH
Quote:

"Stored Energy" is what your looking for and a .920 bar will not do it. You want the newest and the smallest bar you can get your hands on. In a perfect world you want the bar turned all the way up just so the body is just off the bump stops (and that is with the bump stops shaved down to less than an inch thick) You can always control compression and expansion with the shock and limiters.

Just my opinion.



if you tell us where to get them i think we would both try them.

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#183110 - 01/05/09 07:26 PM Re: WHAT TORSION BARS TO RUN [Re: Troy]
Sport440 Offline
master

Registered: 01/20/03
Posts: 5933
Loc: Canton, Ohio
Quote:

"Stored Energy" is what your looking for and a .920 bar will not do it. You want the newest and the smallest bar you can get your hands on. In a perfect world you want the bar turned all the way up just so the body is just off the bump stops (and that is with the bump stops shaved down to less than an inch thick) You can always control compression and expansion with the shock and limiters.

Just my opinion.





While I like the idea of stored energy! Ive seen the effects of to small of bars. The smallest isnt always the best.

Did I ever tell you the story about the 3 bears. mike

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#183111 - 01/05/09 08:55 PM Re: WHAT TORSION BARS TO RUN [Re: moparbud]
Thumperdart Offline


Registered: 07/12/04
Posts: 14472
Loc: State of confusion
I`m running 30 year old 6-cyl bars and they seem to be working ok.


Attachments
4926393-domtrack.jpg (59 downloads)

_________________________

Street driven 3200lbs. n/a 1.39 60ft.6.21 at 110.40 1/8th 9.797 at 135.5.....Home of the "Clean-n-Mean" 2-circuit ThumperCarbs and Superformance gaskets.....760-900-3895

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#183112 - 01/05/09 09:48 PM Re: WHAT TORSION BARS TO RUN [Re: Thumperdart]
Sport440 Offline
master

Registered: 01/20/03
Posts: 5933
Loc: Canton, Ohio
Quote:

I`m running 30 year old 6-cyl bars and they seem to be working ok.





See, Thumper knows the story about the Three bears Too!

As the 6-cyl bars Arent the {thinnest} bars available.

There are {Drag bars} thinnest. And {6-cyl bars} thicker. And {318/340 cyl bars} thicker yet.

So its not always about just getting the Thinnest bars you can get

Its about getting the bars that are more optimum for your combo. mikre

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#183113 - 01/05/09 10:07 PM Re: WHAT TORSION BARS TO RUN [Re: Sport440]
Thumperdart Offline


Registered: 07/12/04
Posts: 14472
Loc: State of confusion
The thin mopar performance bars didn`t work as good as the 6-cyl bars do.


Attachments
4926651-domtrack.jpg (52 downloads)

_________________________

Street driven 3200lbs. n/a 1.39 60ft.6.21 at 110.40 1/8th 9.797 at 135.5.....Home of the "Clean-n-Mean" 2-circuit ThumperCarbs and Superformance gaskets.....760-900-3895

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#183114 - 01/06/09 10:07 AM Re: WHAT TORSION BARS TO RUN [Re: Thumperdart]
moparbud Offline
member

Registered: 11/22/08
Posts: 119
Loc: mo
yes i do have bars in it now it was that way when i got it. the left is smaller then the right. and i have not run this car yet. and just looking to get the right stuff before i go run it. you guys are great and thanks for your help.


Attachments
4927273-68roadrunner006.jpg (50 downloads)


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#183115 - 01/07/09 03:18 PM Re: WHAT TORSION BARS TO RUN [Re: moparbud]
Troy Offline
"Nice Guy"

Registered: 12/02/03
Posts: 3889
Loc: West Coast, CA
Lets talk about the B body first....
B Body are hard because Mopar no longer sells the old P5249156 .840 bars. I would look and see what the after market has. B Body's can be made to work very well but the learning curve is long. You have to have a very consistent engine,trans and rear suspension to be able to fine tune the front suspension. Trying to do this on a fresh chassis is hard to say the least.

Here is a picture of a customer of mine. Chuck Steinbeck has ran this car in D, E and F and has done very well but 10lbs and a 1/2 turn on his shocks makes a big difference. IF I remember correctly these are the some .840 bars.


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4930572-adfadf(Small)(Small)(Small).jpg (81 downloads)



Edited by Troy (01/07/09 03:19 PM)
_________________________
....there is nothing like driving my 1968 Hemi Dart around town and having people looking at you like you're nuts!!

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#183116 - 01/07/09 03:35 PM Re: WHAT TORSION BARS TO RUN [Re: Troy]
Troy Offline
"Nice Guy"

Registered: 12/02/03
Posts: 3889
Loc: West Coast, CA
A body cars......
I believe A body's are a little easyer to play with. Shorter wheel base....less overhang on both front and rear plays a big roll. When Darren Smith (last years world champ) was building his Dart we went through about four sets of bars and a few others that were home made. ( ) We played with spring rates, tapers and everything that we could think of. We learned that you can not compare the spring rates of a coil spring to that of a torsion bar. I thought that was strange but we came to the conclusion that the length of a torsion bar and length of a coil spring (if you unwound it) plays a big roll in spring rates. The bottom line was.....for a very long time Darren ran the MP .840 bars and they worked very well.


Attachments
4930601-Fontana075(Small).jpg (71 downloads)

_________________________
....there is nothing like driving my 1968 Hemi Dart around town and having people looking at you like you're nuts!!

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#183117 - 01/07/09 03:52 PM Re: WHAT TORSION BARS TO RUN [Re: Troy]
Troy Offline
"Nice Guy"

Registered: 12/02/03
Posts: 3889
Loc: West Coast, CA
My old street car (iron headed 440 Duster) being a street, strip car, I ran the .870 bars. This gave me good street manners and yet, when I pulled up hard on the front end....with my hands....the front would rise over seven inches!! Most cars will never do that.

The things I do not like about old, used torsion bars (junk yard 6 cylinder bars) is metal has a memory. It has a natural state that it wants to stay in. When you have used bars the memory or the spring rate start to go away. A new "happy" bar, when installed and tighten up wants to raise the front end up but the weight of the car keeps it down. When you launch the car the momentum and the torsion bars try to pick front end up and put more weight over the rear. When you have week bars....the bars don't want to go up....there is no "spring" left in them so you get no help at all.

I will say this, every car is different and acts different. Sometimes older bars do work in a car but I have to ask my self why??

just my
_________________________
....there is nothing like driving my 1968 Hemi Dart around town and having people looking at you like you're nuts!!

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#183118 - 01/07/09 06:14 PM Re: WHAT TORSION BARS TO RUN [Re: Troy]
Thumperdart Offline


Registered: 07/12/04
Posts: 14472
Loc: State of confusion
My OLD 6-cyl bars are working pretty well I would say...WAY better then the thinnest mp bars but, is there another bar out there for my dart that would work better? If so, I might look into it...


Attachments
4931070-domtrack.jpg (56 downloads)

_________________________

Street driven 3200lbs. n/a 1.39 60ft.6.21 at 110.40 1/8th 9.797 at 135.5.....Home of the "Clean-n-Mean" 2-circuit ThumperCarbs and Superformance gaskets.....760-900-3895

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