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Author
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Topic: How to count active coils?
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Fastback68
Gearhead Posts: 1880
From: Sucat, Paranaque, Philippines
Registered: Jul 99
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posted 12-19-2002 12:42 AM
   
Am I right in thinking that when it comes to calculating spring rate, every coil in a stock Stang coil spring counts as an active coil?
And does anyone have any coil numbers handy for stock coils? My 302 has 8 coils in total, and I've got a new set with 9 coils and the same wire diameter. I was told when I bought them they were heavy duty Stang springs, but now I know more, I figure they're too long.
Thanks!
Simon[This message has been edited by Fastback68 (edited 12-20-2002).]
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SteveLaRiviere
Administrator Posts: 34763
From: Saco, Maine
Registered: May 99
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posted 12-20-2002 01:48 PM
I think each coil must play a slightly different roll in relation to their location on the spring. But I'm not an engineer.------------------
'70 Mustang Mach 1 - '72 Mustang Sprint - '94 F-150 Be sure to remember our sponsors, Mustangs Plus, NPD, and Osborn Reproductions.
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mustangs68
Moderator Posts: 18494
From: Hampton,Virginia,USA MCA#39406 M&M #12
Registered: May 99
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posted 12-20-2002 04:53 PM
Where's SCOOP when you need him..
he should know Spring Rates 
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Toronado3800
Gearhead Posts: 364
From: St. Louis, MO
Registered: Jul 2001
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posted 12-20-2002 09:35 PM
I do not know and have never seen a good comparison of new springs in a magazine. At home I've tested fishing lines and knots by tying one end to a fish scale and the other to a dumbell. I'd love to compress the spring in a huge hydrolic vice which had a pressure guage and measure how many pounds of force it took before we couldn't slide a piece of paper between the coils.
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Fastback68
Gearhead Posts: 1880
From: Sucat, Paranaque, Philippines
Registered: Jul 99
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posted 12-20-2002 11:40 PM
Well, what I've got so far is this ...
1) Spring rate checkers do exist. Race teams use them. But I can't find one 
2) According to this great source ...
http://www.stockcarproducts.com/spgtech.htm
... when counting coils with one end "closed", you subtract one coil when calculating active coils, two when both ends are "closed". I figure stock Stang springs are open, so you count the whole lot.
3) And then I rediscover this great ol' M&M thread about spring rates ...
https://mustangsandmore.com/ubb/Forum1/HTML/006013.html
... in which Sundance talks about having just 6.125 active coils in his stock 65 V8 springs.
That's why I'm wondering if I'm counting wrong. 8 or 9 coils vs. 6.125 is a big difference.
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