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Unread 2010-10-13, 08:15 PM   #1
Dr.John
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Default Spring Rates

Quote:
Originally Posted by dropNdestroy
Spring Rates


Stock front springs on Civics are 240 rears are 110 (4k/2k)

I was looking through the spring rate chart for various vendors, and thought this might be useful.

1lb = 0.45359237kg
1in = 25.4mm

.45359237 / 25.4 = .017857967322834645669291338582677

So now we know that 1lb/in = .017857967322834645669291338582677.

So if we want a spring that's roughly 560lbs; we'd multiply both sides by 560, and come up with roughly a 10k spring rate. Alternatively if you already know the kg/mm rate and want to find out what the lbs/in is, just divide the spring rate by that reaaally long factoral above (the .0178...).

But just in case you all didn't want to go through all that, here's a chart:

kg/mm to lbs/in
-----------------------------
16 = 896
15 = 840
14 = 784
13 = 728
12 = 672
11 = 616
10 = 560
9.0 = 504
8.5 = 476
8.0 = 448
7.5 = 420
7.0 = 392
6.5 = 364
6.0 = 336
5.5 = 308
5.0 = 280
4.5 = 252
4.0 = 224
3.0 = 168
2.0 = 112

Read more at http://forums.evolutionm.net/evo-tir...ktrack=kcplink

For the sake of comparison, typical OEM spring rates for these applications are approximately 220#/in front, and 110#/in rear. With the numerous Civic & Integra applications, there is a range of spring rates, and these CS-II systems are significant upgrades from your OEM damper and spring calibrations.
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Unread 2010-10-13, 10:28 PM   #2
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Neg rep coming to you Dr John
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Unread 2010-10-14, 09:35 PM   #3
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Neg rep coming to you Dr John
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