 Rear springs |
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| malcolm2 |
 Nov 17 2015, 09:43 PM
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#1
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Advanced Member  Group: Members Posts: 2,747 Joined: 31-May 11 From: Nashville Member No.: 13,139 Region Association: South East States 
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Going from old-wornout-came-on-the-car KYB to free-better-condition KYB. Something always bites me in the ass. One of my top nuts is stripped.
Anyway: I did notice that the springs going on have 11 coils and the ones coming off have 8. I was told the ones going on were 100# springs. The ones coming off have SP100 weltmeister printed on them. So what is the deal with the coil count? |
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| malcolm2 |
Nov 18 2015, 08:05 AM
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#2
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Advanced Member Group: Members Posts: 2,747 Joined: 31-May 11 From: Nashville Member No.: 13,139 Region Association: South East States
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anyone know about springs?
I figured the heavy ones would have a larger steel bar cross section but not more or less coils. |
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| relentless |
Nov 18 2015, 01:51 PM
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#3
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Member Group: Members Posts: 350 Joined: 1-April 07 From: Oregon Member No.: 7,636 |
Fewer coils for the same wire type and diameter makes for a stiffer spring. We used to cut a coil off of the spring on a dirt bike to stiffen it up back in the day.
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| malcolm2 |
Nov 18 2015, 04:29 PM
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#4
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Advanced Member Group: Members Posts: 2,747 Joined: 31-May 11 From: Nashville Member No.: 13,139 Region Association: South East States
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I was thinking the opposite. More coils more weight stiffer springs. Does anyone know the ratio coils to pounds?
Since my old ones have 8 coils and a 100 printed on them I guess that would be a good baseline. Would 20% more coils equal 20% less stiffness? |
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| Dave_Darling |
Nov 18 2015, 06:41 PM
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#5
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914 Idiot Group: Members Posts: 15,200 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California
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Google says:
http://www.bluecoilspring.com/rate.htm Basically, the less material you have the stiffer the spring. Think of our car's front torsion bars. Would a long bar twist more easily, or a short one? Yeah, the long one would. Now wrap that torsion bar around and around, and you get a coil spring. More coils means longer length of material, means softer spring. The short answer: Given the same material, wire diameter, and so forth, the 8-coil spring would be about 25% stiffer than the 10-coil spring. --DD |
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| bulitt |
Nov 19 2015, 07:10 AM
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#6
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Achtzylinder Group: Members Posts: 4,189 Joined: 2-October 11 Member No.: 13,632 Region Association: South East States |
Imagine unraveling the spring into a straight length.
You could bend a 4 ft piece with your hands. Now try to bend a 6 inch section. wont happen. It's basically a lever wound round. |
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| malcolm2 |
Nov 19 2015, 11:01 AM
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#7
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Advanced Member Group: Members Posts: 2,747 Joined: 31-May 11 From: Nashville Member No.: 13,139 Region Association: South East States
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GOOGLE not sure why i did not think of that. Thanks. I'll have them on the car this afternoon.
Thanks for the input. |
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