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Originally Posted by Ultramaroon
I'm pretty sure it has nothing to do with the material's mass and a lot to do with its shear modulus. Given equal spring displacement, more coils result in less strain per unit length of wire.
This means the wire in the swift spring has to twist more than the generic spring for a given displacement.
I'm not expert in this application but in general, less turns must be paired with thinner/weaker wire to get the same spring constant. At some point it impacts lifespan of the spring.
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I'm not an expert in the manufacturing/design of springs neither, so this is something that I would need to look into further. As mentioned though, it was just something that the Swift technician briefly explained to me during our last meeting. If I recall correctly, he basically said a 10K spring will always have the same overall mass, regardless of length. I will clarify with him again.
Regarding "Given equal spring displacement, more coils result in less strain per unit length of wire.", that is correct, however, you also need to factor in the material used. Not all springs are made from the same material, hence the differences between Swift/Hyperco/Eibach/Taiwan etc
I will run some tests on used/older springs and see what results come up.