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According to the specifications in Noland’s book, the front spring specs are: length 13.45 in. free, 9.72 in. at curb weight; and 300 #/inch rate at spring (110#/in at wheel). So 3.73 inches compression requires 1119# at the spring, which is 410# at the wheel. So, two front wheels must share 820#. That leaves from curb weight of 2926#, 2106# on the rear wheels. Spec says "capacity" of front springs is 800# each, rear springs 725# each - that would total 3050#, versus loaded weight 3226#. What’s wrong with this picture?
... Al ‘58 #378 245hp NCRS SACC
You have to multiply the wheel rate times wheel vertical movement from the point where the suspension begins to compress the spring, which will probably be about double the actual spring compression due to the leverage ratio.
You multiply spring rate times spring compression to compute spring load.
The load at the wheel is wheel rate times TOTAL wheel movement from the point where it begins compressing the spring to normal ride height. You would have to disassemble the kingpins to determine where the control arm actually begins compressing the spring as there is some compression at the rebound stop.
As far as the total spring loads are concerned, I can't account for the discrepency between "spring capacity" and vehicle weight, but I don't think it's something should be concerned about vis-a-vis spring durability.
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