130 suspension too hard?

**rick130** · 14th October 2010, 06:54 PM

Originally Posted by madandmuddy

Right, just had a look and looks to be 9 complete turns. Not really any space between the top 3 or so coils. 19mm looks to be accurate, can't find the calipers but a 19mm spanner just pushes on.

Sounds like a variable rate spring, which gets a bit harder to work out, and the wire diameter and number of coils would tally with this one.
RKB101111

Which is a 110/130 OE rear spring from VIN 159807 with a rate of 270/420lb/in according to JB.

The formula I've always used (and tallies with Land Rover spring rates) is

K=Gd(to the powerof4)/64R(to the power of 3)N

Where K=spring rate (pounds)
G= modulus of rigidity which for most spring steels is 1500000
d= wire diameter in inches
R= mean radius of spring
N= number of active coils

To work out the number of active coils is the total number of coils less...

Squared and ground ends = -1.75 (Land Rover and FWIW coil over race car springs)
plain ends = -0.5
plain ends ground = -1.0

**madandmuddy** · 14th October 2010, 07:03 PM

Hmmm, certainly looks like it could be the same spring! Also if the paint marking are only on the top 3 coils like that one, rather than all the way down like the fronts, I could well of missed them. If at the back with the top 3 compressed you would never see the markings!

Thanks for the help with that, very much appreciated.

Now just remans to decide what to put in instead

**PAT303** · 14th October 2010, 07:14 PM

I'm moving up to Newman next week and I'll be loading my old girl up so I re-fitted my HD springs and the handling and ride have gone to crap.Like Rick said my shocks are topping out and the inner wheel is bouncing around corners so I know where your coming from.I'll have a new 130 next March if all goes to plain and will remove the hard springs and go softer mains with airbag inners. Pat

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