Racing Formulas: Spring Height, Rate, Deflection & Load
Review the below formulas to properly evaluate spring performance in racing applications, or access our Spring Rate Calculator.
|Solid Height||= (Number ofCoils – 0.25) x Wire Diameter|
|For example, for a spring with 14 coils and a wire diameter of 0.5”, the Solid Height would be calculated as follows:|
|Solid Height||= (14 – 0.25) x 0.5|
|Rate||= Load (lbs.) ÷ Spring Deflection (in.)|
|For example, if a spring deflects by 2.75” under a load of 300 lbs, the Rate would be calculated as follows:|
|Rate||= 300 ÷ 2.75|
|Deflection||= Load (lbs) ÷ Rate|
|For example, a spring under a load of 300 lbs with a 109 Rate, the deflection would be calculated as follows:|
|Deflection||= 300 ÷ 109|
|Load||= Deflection x Rate|
|For example, a spring with a 109 Rate and a 2.75” deflection, the load would be calculated as follows:|
|Deflection||= 2.75 ÷ 109|
Combined Spring Rate
This is used when two springs are stacked on top of each other.
Combined Spring Rate = (Spring Rate ‘A’ x Spring rate ‘B’) ÷ (Spring Rate ‘A’+Spring Rate ‘B’)
For example, if the rate for spring ‘A’ is 200 and the rate for spring ‘B’ is 500, the combined rate is calculated as follows:
Combined Spring Rate =
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