prey
Part of things
Posts: 856
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can anyone explain this one to me? or even better is there a rough formula for how much a rate changes for each coil cut for example?
before anyone says don't its to cut a coilover spring for use in the rear to replace a pigtail spring, so don't panic!
i'm thinking if i can get a 12" 300lb, chop it in half - or 1/3 - what rate would that give me?
muchas gracias for any help ;D
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As you cut a spring, the rate goes up proportionally - For each inch travel now, each coil has to compress twice as much)
Cutting a 300lb spring in half would make it a 600lb spring.
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prey
Part of things
Posts: 856
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that's magic mate, thanks. i hadn't dared to hope it was that simple but if it is that makes me life a lot easier! leg-end...
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Spring rate is measured in newtons per metre (properly,anyway)and is given the denomination K Distance (X) is measured in metres force (F) is measured in newtons - one kg is 9.81N the equation is a nice simple: K=F/X Simply,shove on a decent weight (10-20kg) measure the displacement (in metres, so 1cm is 0.01m) and you'll have your K rating  |
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You're like a crazy backyard genius! |
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prey
Part of things
Posts: 856
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that's really handy to know as well, ta!
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another rather pointless titbit... the natural frequency of a spring, is the square root of K/M (mass, in kg) SQRT (K/M) Fairly useless for most people, lol |
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You're like a crazy backyard genius!
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prey
Part of things
Posts: 856
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have to admit that i have no idea what that means in the real world - fancy elaborating?
every days a school day it seems
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RobinJI
Posted a lot
"Driven by the irony that only being shackled to the road could ever I be free"
Posts: 2,995
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If you're replacing a pig-tail spring then make sure you don't end up with the spring going coil-bound too early. Pig-tail springs have the freedom to compress inside them selves, so tend to have quite a short compressed length compared to a constant diameter spring like used on coilovers.
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have to admit that I have no idea what that means in the real world - fancy elaborating? every days a school day it seems virtually no "real-world" application I'm afraid! Lol, just one of the many equations I've had to memorise for uni (Automotive Engineering) |
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You're like a crazy backyard genius!
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don't forget the other formula: (no. of coils chopped off / time taken to correct resulting balls-up of suspension geometry) ^ time taken to post the results on the internet for admiration, gives you the 'scene victim quotient'
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prey
Part of things
Posts: 856
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lol it's not for mega scene points etc, i've coilovered my front struts, gaz adjustable shocks are on the shopping list and want to be able to play with the spring rate on the back a bit, getting hold of a few long springs and chopping about will be easier/cheaper than buying a shedload of made to measure pigtails. the car won't be silly low, as i need sensible camber on the back as well!
some great info here though, and much appreciated!
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