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  '64 1/2 to '73 -- The Classic Mustang
  How to count active coils?

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Author Topic:   How to count active coils?
Fastback68
Gearhead

Posts: 1880
From: Sucat, Paranaque, Philippines
Registered: Jul 99

posted 12-19-2002 12:42 AM     Click Here to See the Profile for Fastback68   Click Here to Email Fastback68     Edit/Delete Message   Reply w/Quote
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

posted 12-20-2002 01:48 PM     Click Here to See the Profile for SteveLaRiviere   Click Here to Email SteveLaRiviere     Edit/Delete Message   Reply w/Quote
I think each coil must play a slightly different roll in relation to their location on the spring. But I'm not an engineer.

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mustangs68
Moderator

Posts: 18494
From: Hampton,Virginia,USA MCA#39406 M&M #12
Registered: May 99

posted 12-20-2002 04:53 PM     Click Here to See the Profile for mustangs68   Click Here to Email mustangs68     Edit/Delete Message   Reply w/Quote
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

posted 12-20-2002 09:35 PM     Click Here to See the Profile for Toronado3800     Edit/Delete Message   Reply w/Quote
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

posted 12-20-2002 11:40 PM     Click Here to See the Profile for Fastback68   Click Here to Email Fastback68     Edit/Delete Message   Reply w/Quote
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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