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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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Well, as long as the stress on the spring doesn't exceed the fatigue limit of the material, it should last damn near forever right? I think that's where a brand name spring's metallurgy and higher detail of engineering come in. My guess is that they also probably have a lower factor of safety because there is more control over the manufacturing process.
I went to school for aero, so my materials science education is a bit basic, so I may be missing something.
Also, I'm very proud of myself for engaging in technical discussion without using acronyms.