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Author: Subject:  torsion bar spring rates??
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posted on December 16th, 2013 at 09:44 PM
torsion bar spring rates??


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
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posted on December 16th, 2013 at 09:51 PM



yep



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posted on December 16th, 2013 at 09:53 PM



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

http://www.swayaway.com/TorsionBars.php 
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posted on December 16th, 2013 at 10:01 PM



None of them had the spring rates
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posted on December 17th, 2013 at 08:26 AM



Quote:
Originally posted by Craig Torrens
yep


Well??
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posted on December 17th, 2013 at 09:22 AM



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

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




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posted on December 17th, 2013 at 01:51 PM



I am well thanks Chris :lol::lol::lol::lol:



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posted on December 17th, 2013 at 02:38 PM



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

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




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Originally posted by westi
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posted on December 17th, 2013 at 04:06 PM



Quote:
Originally posted by dangerous
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 ;)




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posted on December 17th, 2013 at 06:28 PM



Quote:
Originally posted by Craig Torrens
Quote:
Originally posted by dangerous
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

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posted on December 17th, 2013 at 09:01 PM



Any for the front dave
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posted on December 18th, 2013 at 07:27 AM



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



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posted on December 18th, 2013 at 09:13 AM



Quote:
Originally posted by Sides
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..
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posted on December 18th, 2013 at 02:34 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).



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posted on December 19th, 2013 at 08:40 AM



Quote:
Originally posted by BRUTUS
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.




Quote:
Originally posted by westi
That's mad Alan.


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