Question for the Metal Geeks, Torsion Bars

[Protour_Pinto]

I have a 70 Eldorado front clip that Im mounting in the back of my Toyota Pick up and stock it had torsion bars.

I have been trying to think of ways to suspend it and it comes down to coilovers pushing on the top control arms or running a bar in the stock location that is supported on the back with a Pillow Block. I would weld a small arm, 6 inches or so to act as the lever for the coil over shock. or just the spring.

The Upper control arm way would require me to reinforce the arm since it was not designed to support the weight of the car.

My question would be, Do you think a 18 inch long X 1.50" piece of Hex stock would have the torsional strength to hold up and not just Twizzler on the first bump? I could Always turn it down and plug weld a larger tube to it also.

[raustinss]

No it can't be just a "regular". Piece of steel ....it needs to be spring steel . If you are wanting to reinvent the wheel if you will try to use a torsion bar that has already been produced, make a list of stock vehicles that use them and start doing some home work

[Protour_Pinto]

Im not thinking of it as being the torsion itsself, Just trying to locate the coilover shock rearward and using the bar as a way to link the lower control arm to the shock. A rotating remote shock of sorts.

I cant think of any cars that have a torsion bar that is only 18 inches long but will search

[Bryce]

Take a look at the pure vision Fairlane from SEMA a few years back.

http://www.purevisiondesign.com/rides/projects/black-ops-fairlane.html

They did a pretty trick torsion bar setup. May give you some ideas.


To your original question:
you would don't want the hex bar to deflect, otherwise it acts as another spring in series and will screw with the coilover.
I simplified the equation using a solid 1.5" diameter cylinder instead of a hex rod. I assumed a 12in lever arm and a 1000 pound load on the coilover.
This resulted in a 1.7 degrees of rotation.
The rotation is directly proportional to length of the rod and the force on the coilover.

So a 9" rod with only 500lb load is only .4 degrees of rotation.

[Protour_Pinto]

Thanks for that! I will go check that Fairlane now.

I figure the arm will be about 6 inches and about half way down the bar.

The back of the chain cover is pretty much right at the back of the truck. I will take better pictures tomorrow.

https://static1.pt-content.com/images/pt/2016/09/CAM02361_zpsnenfg2ay-1.jpg


Take a look at the pure vision Fairlane from SEMA a few years back.

http://www.purevisiondesign.com/rides/projects/black-ops-fairlane.html

They did a pretty trick torsion bar setup. May give you some ideas.


To your original question:
you would don't want the hex bar to deflect, otherwise it acts as another spring in series and will screw with the coilover.
I simplified the equation using a solid 1.5" diameter cylinder instead of a hex rod. I assumed a 12in lever arm and a 1000 pound load on the coilover.
This resulted in a 1.7 degrees of rotation.
The rotation is directly proportional to length of the rod and the force on the coilover.

So a 9" rod with only 500lb load is only .4 degrees of rotation.

[Protour_Pinto]

That rear setup is pretty slick. I will have to do some measuring and spend the day at pick a parts looking at possibilities.

Thanks for pointing me to that.




Take a look at the pure vision Fairlane from SEMA a few years back.

http://www.purevisiondesign.com/rides/projects/black-ops-fairlane.html

They did a pretty trick torsion bar setup. May give you some ideas.




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