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torsion bar spring rates??

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cnfabo Custom Title Time!

1,353 posts · joined Apr 2008 ·

#977924
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 6 times Australian, 7 times State Hillclimb Class Champion

8,040 posts · joined Jan 2003 ·

#977925
yep


cnfabo Custom Title Time!

1,353 posts · joined Apr 2008 ·

#977929
None of them had the spring rates

cnfabo Custom Title Time!

1,353 posts · joined Apr 2008 ·

#977944
Craig Torrens wrote:yep
Well??

HappyDaze Superannuated

2,887 posts · joined Jun 2009 ·

#977946
Craig will probably answer:- "I am well thanks Chris".

You need to ask him:- "What are the spring rates, Craig?". 😁
I'd rather wear a Beetle out by racing it than by polishing it!

Craig Torrens 6 times Australian, 7 times State Hillclimb Class Champion

8,040 posts · joined Jan 2003 ·

#977966
I am well thanks Chris 😂😂😂😂


dangerous 23 Windows of Awesome

5,901 posts · joined Jan 2005 ·

#977970
Wheel rate:
28mm is 242lbs
30mm is 319lbs.

this assumes 26 9/16" length bar and 16" lever.
westi wrote:That's mad Alan.

Craig Torrens 6 times Australian, 7 times State Hillclimb Class Champion

8,040 posts · joined Jan 2003 ·

#977977
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 Custom Title Time!

1,353 posts · joined Apr 2008 ·

#977987
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 Custom Title Time!

1,353 posts · joined Apr 2008 ·

#978016
Any for the front dave

Sides Veteran Volks Folk

2,220 posts · joined May 2007 ·

#978037
So you goin the 28's or the 30's Chris ?
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cnfabo Custom Title Time!

1,353 posts · joined Apr 2008 ·

#978045
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 Officially Full-On Dubber

255 posts · joined Feb 2006 ·

#978068
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).
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dangerous 23 Windows of Awesome

5,901 posts · joined Jan 2005 ·

#978136
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.
westi wrote:That's mad Alan.