Quote:
Originally Posted by Stretch
No I get that - but - you need to know how many turns of the coil you have for each spring.
When you have a spring that has say 10 free coils that are not touching each other you've got a stiffness that is equal to say X N/mm
Compress the spring to fit it in the car and you might find that you've only got 8 free coils that don't touch each other. The stiffness will be INCREASED to say XX N/mm
If you then want to change the height again for a race situation then you may only have 6 free coils that don't touch each other so you've then got a stiffness of XXX N/mm
The over all length of the spring and the number of turns and the gauge of the wire and the mean diameter are all important considerations (assuming you know what stiffness you want from a stability calculation)
[Also if you want a height change on the front springs you'll end up with some pretty messed steering geometry / camber / castor on a standard W123 front suspension design]
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Well, linear springs have equal spacing and thickness between all active coils. They should compress equally and one shouldn't touch another until they are all touching. These aren't progressive springs.