Spring rate calculations.....
Thread Starter
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Tuned
Joined: Jul 2007
Posts: 412
Likes: 13
From: Vacaville, California
Spring rate calculations.....
Hey Guys....
I built a four link front with coilovers under my 69 Crew Cab and being that I was unable to weigh the truck corners for proper spring rate, I just took a guess. Well the guess turns out to be too stiff.
I'm using a 14" 500 lb. spring over a 18" 750 lb. spring and when I loaded the suspension, they only compressed a total of 3.250". The top spring compressed 2.00" and the bottom 1.250".... so from that information can the correct spring rates be determined? Looking for about a total of 8.00" of compression at ride height.... so another 5.00" of drop.
I know that there are some engineer types on this forum.... hopefully someone can be of some help on this!
Thanks!
I built a four link front with coilovers under my 69 Crew Cab and being that I was unable to weigh the truck corners for proper spring rate, I just took a guess. Well the guess turns out to be too stiff.
I'm using a 14" 500 lb. spring over a 18" 750 lb. spring and when I loaded the suspension, they only compressed a total of 3.250". The top spring compressed 2.00" and the bottom 1.250".... so from that information can the correct spring rates be determined? Looking for about a total of 8.00" of compression at ride height.... so another 5.00" of drop.
I know that there are some engineer types on this forum.... hopefully someone can be of some help on this!
Thanks!
Post Fiend
Joined: Jul 2005
Posts: 6,127
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Post Fiend
Joined: Jul 2006
Posts: 6,948
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You have some variables that make this a difficult question to answer.
One you have addressed, and this is the force applied to the coil itself.
Next is the angle in which the spring has to operate. Vertical mounting means that the spring is the most efficient, and any working angle at all will kill some deflection.
The same is true for mounting of the spring, and where it is mounted relative to the link pivot(S).
Link suspensions can work like cantilevers, and this will have an affect on the overall rate of the spring as well.
One you have addressed, and this is the force applied to the coil itself.
Next is the angle in which the spring has to operate. Vertical mounting means that the spring is the most efficient, and any working angle at all will kill some deflection.
The same is true for mounting of the spring, and where it is mounted relative to the link pivot(S).
Link suspensions can work like cantilevers, and this will have an affect on the overall rate of the spring as well.
Thread Starter
|
Tuned
Joined: Jul 2007
Posts: 412
Likes: 13
From: Vacaville, California
You need to use a calculator like this:
Compression Spring Constant (k) Calculator -* Engineers Edge
Compression Spring Constant (k) Calculator -* Engineers Edge
Thread Starter
|
Tuned
Joined: Jul 2007
Posts: 412
Likes: 13
From: Vacaville, California
You have some variables that make this a difficult question to answer.
One you have addressed, and this is the force applied to the coil itself.
Next is the angle in which the spring has to operate. Vertical mounting means that the spring is the most efficient, and any working angle at all will kill some deflection.
The same is true for mounting of the spring, and where it is mounted relative to the link pivot(S).
Link suspensions can work like cantilevers, and this will have an affect on the overall rate of the spring as well.
One you have addressed, and this is the force applied to the coil itself.
Next is the angle in which the spring has to operate. Vertical mounting means that the spring is the most efficient, and any working angle at all will kill some deflection.
The same is true for mounting of the spring, and where it is mounted relative to the link pivot(S).
Link suspensions can work like cantilevers, and this will have an affect on the overall rate of the spring as well.
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