Rear Leaf Spring (Spring Rate)
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From: DFW
Rear Leaf Spring (Spring Rate)
Generally stated:
Spring rate is the amount of force that is required to move a spring and is measured in pound-force per inch (lb-in)
Ok so I know there are several different STOCK rear spring configurations so a general question is a waste of time and will get responses referring to the many different springs installed on these trucks SO:
With the truck sitting static is there any data on the actual weight (tongue, pin or passengers/cargo box weight) required for each stock rear spring to start compressing?
I would think there is some information other than just the MAX load rating and I would guess the springs can handle a certain amount of weight before deflection (compression) begins.
Any ideas?
Spring rate is the amount of force that is required to move a spring and is measured in pound-force per inch (lb-in)
Ok so I know there are several different STOCK rear spring configurations so a general question is a waste of time and will get responses referring to the many different springs installed on these trucks SO:
With the truck sitting static is there any data on the actual weight (tongue, pin or passengers/cargo box weight) required for each stock rear spring to start compressing?
I would think there is some information other than just the MAX load rating and I would guess the springs can handle a certain amount of weight before deflection (compression) begins.
Any ideas?
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From: Mills River
The springs are already compressed when the truck is not loaded due to the sprung weight at the back of the truck. The empty bed weighs ~400 lbs. The springs will deflect further when the bed is loaded.
HTH,
Jim / crewzer
HTH,
Jim / crewzer
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From: DFW
Found this "Chart" in a different post about rear springs and while not familiar with the way the springs are rated or classified I would take the 7th column as the different weights at which the springs are engaged and start to deflect which kinda answers my original question.
Any weight I understand should cause a deflection but does this chart state that first number LBS fully engages (deflects) the first stage, the second and third as well?
5th Wheeling
Joined: Feb 2020
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Found this "Chart" in a different post about rear springs and while not familiar with the way the springs are rated or classified I would take the 7th column as the different weights at which the springs are engaged and start to deflect which kinda answers my original question.
Any weight I understand should cause a deflection but does this chart state that first number LBS fully engages (deflects) the first stage, the second and third as well?
Is this information available for the 2020F350 MAX GVW 11400lbs
Logistics Pro
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From: Mills River
5th Wheeling
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Thanks so much
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From: Mills River
My recollection is that spring rates are based on resting (unloaded) states. Accordingly, deflection calculations should be based on total applied force.
However, as aptly pointed out above, we don’t know where the rate-change displacement measurements are.
HTH,
Jim / crewzer
However, as aptly pointed out above, we don’t know where the rate-change displacement measurements are.
HTH,
Jim / crewzer
5th Wheeling
Joined: Feb 2020
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I would guess the change is at each weight point
First 350 lbs nets 1" I assume at this point the second stage starts
Next 700 lbs is another inch or we should see 2nd inch overall. Then the third stage kicks in
Then for every 1400lbs after that is an inch.
Whats not know is the deflection linear with the increased weight, especially the 3rd stage
In another thread I have ask folks to post the deflection they are getting with what loading. No responses yet.
Thanks for the help on this
Keith
First 350 lbs nets 1" I assume at this point the second stage starts
Next 700 lbs is another inch or we should see 2nd inch overall. Then the third stage kicks in
Then for every 1400lbs after that is an inch.
Whats not know is the deflection linear with the increased weight, especially the 3rd stage
In another thread I have ask folks to post the deflection they are getting with what loading. No responses yet.
Thanks for the help on this
Keith
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Posts: 774
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From: CNM
I would guess the change is at each weight point
First 350 lbs nets 1" I assume at this point the second stage starts
Next 700 lbs is another inch or we should see 2nd inch overall. Then the third stage kicks in
Then for every 1400lbs after that is an inch.
Whats not know is the deflection linear with the increased weight, especially the 3rd stage
In another thread I have ask folks to post the deflection they are getting with what loading. No responses yet.
Thanks for the help on this
Keith
First 350 lbs nets 1" I assume at this point the second stage starts
Next 700 lbs is another inch or we should see 2nd inch overall. Then the third stage kicks in
Then for every 1400lbs after that is an inch.
Whats not know is the deflection linear with the increased weight, especially the 3rd stage
In another thread I have ask folks to post the deflection they are getting with what loading. No responses yet.
Thanks for the help on this
Keith
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