torsion bar spring rates?? · Aussieveedubbers

cnfabo · 16 Dec 2013, 9:44 pm

Hi guys & gals, does anyone know the spring rates for long IRS 28 & 30mm torsion bars,also for the std bj beam leaf stack...

Thanks
Fabo

Craig Torrens · 16 Dec 2013, 9:51 pm

yep

1303Steve · 16 Dec 2013, 9:53 pm

http://www.swayaway.com/VWLeafSprings.php

http://www.swayaway.com/TorsionBars.php

cnfabo · 16 Dec 2013, 10:01 pm

None of them had the spring rates

cnfabo · 17 Dec 2013, 8:26 am

Craig Torrens wrote:yep

Well??

HappyDaze · 17 Dec 2013, 9:22 am

Craig will probably answer:- "I am well thanks Chris".

You need to ask him:- "What are the spring rates, Craig?". 😁

Craig Torrens · 17 Dec 2013, 1:51 pm

I am well thanks Chris 😂😂😂😂

dangerous · 17 Dec 2013, 2:38 pm

Wheel rate:
28mm is 242lbs
30mm is 319lbs.

this assumes 26 9/16" length bar and 16" lever.

Craig Torrens · 17 Dec 2013, 4:06 pm

dangerous wrote:Wheel rate:
28mm is 242lbs
30mm is 319lbs.

this assumes 26 9/16" length bar and 16" lever.

Just remember the spline section doesn't twist, so that needs to be accounted for to give more accurate calcs 😉

cnfabo · 17 Dec 2013, 6:28 pm

Craig Torrens wrote:
dangerous wrote:Wheel rate:
28mm is 242lbs
30mm is 319lbs.

this assumes 26 9/16" length bar and 16" lever.
Just remember the spline section doesn't twist, so that needs to be accounted for to give more accurate calcs 😉

close enough hairy muff....................he he

thanks muffin man

cnfabo · 17 Dec 2013, 9:01 pm

Any for the front dave

Sides · 18 Dec 2013, 7:27 am

So you goin the 28's or the 30's Chris ?

cnfabo · 18 Dec 2013, 9:13 am

Sides wrote:So you goin the 28's or the 30's Chris ?

Not sure yet dave,give me a month or so to finish the body then I'll decide..

BRUTUS · 18 Dec 2013, 2:34 pm

For a uniform circular rod, the value should be proportional to the fourth power of the ratio of the diameters, so if you know one figure you can calculate any other (for the same material).

dangerous · 19 Dec 2013, 8:40 am

BRUTUS wrote:For a uniform circular rod, the value should be proportional to the fourth power of the ratio of the diameters, so if you know one figure you can calculate any other (for the same material).

Yes,
so to work out for a shorter(stiffer) bar,
just divide buy the shorter length
and multiply by the longer length.

The effective length will depend on spline length, and
where the radii starts and finishes, so will be an approximation.

Personally I would measure the length of only the parallel part,
which will be the closest.

Craig is correct,
the effective length used will have to be less than the advertised length that I used for the calcs.