robo, you can't tell the spring rate by number of coils alone. thickness of coils, space between etc etc come into it
a suspension shop will be able to tell you, and at worse a new set of springs are 100-150 a pair
hey guys,
how can i tell what the spring rate is of these?
help me out
thanks robo
robo, you can't tell the spring rate by number of coils alone. thickness of coils, space between etc etc come into it
a suspension shop will be able to tell you, and at worse a new set of springs are 100-150 a pair
1kg/mm
i need wire diameter, number of active coils, free height etc
by eye is about 7-8kg
but eye is not accurate
Are there any markings on the spring? My Eibach springs have a number painted onto them signifying the technical data relating to the spring.
some brands of spring are colour coded for a certain weight range.
go to a decent suspension shop that does spring compression, and they should* be able to pressure test them for a more accurate reading.
*note: some shops will look at you cock-eyed and just tell you to get bent.
robo why dont you take them out and measure them yourself? do you know how to do that?
30kw club
I don't how do you Sam?
there not mine... just wondering cause im thinking of buying them, and the acution listing doesnt say anything about rates..
thanks anyway
and Inner Diameter... Free height is not so important. The formula goes a little something like this:
G = 1010.6 kg/mm - (Modulas of Elasticity) Property of Spring Steel which is Constant, this is an approximate value but will get you within 10%
Nc = No of Active Coils (As these are Squared and Ground -1 from Total No of Coils)
Wd = Wire Diameter of Spring
Di = Inner Diameter of spring
_____G . Wd_____= Spring Rate (kg/mm)
Nc . ((Wd+Di)/Wd)<sup>3</sup>
for example: It looks like those springs are about 8.5 Coils, 12mm Wire Diameter and 2.5in Internal Diameter = 65mm.
Wd = 12mm
Di = 65mm
Nc = 7.5 (Total No Coils is 8.5 -1)
would result in a Spring Rate of about a 6kg/mm
Also If you have a spring Rate in kg/mm and want to convert it to the old lb/in multiply it by 56
i.e. 8kg/mm x 56 = 448lb/in