Questions about coil springs: length, preload, and spring rate

Author: Helen

Apr. 29, 2024

Automobiles & Motorcycles

Questions about coil springs: length, preload, and spring rate

I'm by no means an expert on this stuff as the whole spring length vs. rating vs. preload vs. valving equation makes my head spin. All I know is that my Kings with 600# springs adjusted for ~2.25" lift are pretty darn stiff, too. I do know eventually I'm going to be adding a heavier bumper so I don't want to go with lighter springs, but it was suggested to me that I get my Kings revalved for a softer ride so that's what I plan on doing when the time comes to rebuild them.

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Tightly vs loosely wound coil springs?

80sFast said:
Vajingo said:

Spring bind will occur sooner with the tightly wound. But, do you have enough suspension travel to cause spring bind?

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well this is what I'm trying to figure out really. Looking at the picture (and from the comment made by the guy that took it) there's about 1/4" or 3/8" gap between each coil so with 10 spaces that's 2.5" to 3.5" of up travel. That doesn't seem like much for a tundra. Am I thinking about this all wrong? 

It's not a strut, so you have to consider motion ratio. From that picture if the spring has 3" of travel that probably equates to ~5" at the wheel which isn't a ton but is certainly more.

Also worth noting about the two photos from the original post, the second one appears to have the wheel off which means the spring is uncompressed so that's not a direct comparison.

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