Whats coil bind?

[TexGQ]

Title says it all" what's coil bind"

[Peter @ Aawen4x4]

When the weight that you have in the car collapses the space in the coil windings down so that the coil windings are sitting one on top of the other! It tends to restrict further compression, but leaves heaps of extension available as soon as you lessen the load or drive that wheel over a hole at speed! Can be noisily painful, and it can occur before the wheels hit the bump stops if you haven't modded the bump stops when you've changed the length of the coil, etc!

Why do you ask?

[TexGQ]

It was mentioned to me that it may be the cause of my suspension sag along with the signs to look for, had never heard the expression before so thought I'd ask, but its not my problem so its something ruled out

[sudso]

When the weight that you have in the car collapses the space in the coil windings down so that the coil windings are sitting one on top of the other! It tends to restrict further compression, but leaves heaps of extension available as soon as you lessen the load or drive that wheel over a hole at speed! Can be noisily painful, and it can occur before the wheels hit the bump stops if you haven't modded the bump stops when you've changed the length of the coil, etc!

Why do you ask?Or when you land so hard :D :o.............................
If your bump stops are long enough spring bind wont happen though.
Happens to valve springs sometimes too if incorrect rocker ratio etc.

[terra88]

It was mentioned to me that it may be the cause of my suspension sag along with the signs to look for, had never heard the expression before so thought I'd ask, but its not my problem so its something ruled out

suspension sag would cause "coil bind" and the only times i've heard coil bind is when it was associated with noise from cars with lowered suspension or when the rubber insulators have perished causing the spring to wear through the powdercoating and then rub with the spring seats etc

[et4wd]

hey Tex if the coils bind and there is enough left over upward force ( from the diff ) then the springs can bend out or in as they have no room left to move thus causing the rig to look lower as the spring has bent out or inwards.
Easy way is to grab a small spring and compress it and then push some more and you will see it will pop out to one side, that was what i was trying to explain to you, sorry if i confused you.

Steve.

[sudso]

It was mentioned to me that it may be the cause of my suspension sag along with the signs to look for, had never heard the expression before so thought I'd ask, but its not my problem so its something ruled outHmmm, I always thought coil bind (or coil spring bind) was when the coils are fully compressed (each coil hard against each other) and cannot compress any further and still have some weight or force trying to compress them more.

So if your coils bind up like that it means your bump stops are too short because they should limit the compression travel of the springs before they bind up, regardless of whether the springs have sagged or not.

cheers, sudso

[Peter @ Aawen4x4]

The more frequently the coils compress down to that coil on coil state, with still more compression being sought, just like Steve suggests, the coils get to the stage where they no longer sit one on top of the other, but some of the coils get forced out of line and get permanently bent into that off line state!

The coils start looking like lopsided slinky's, and they work just about as well in the springing stakes! Not only can it cause spring sag, it can result in the body being way off line with the chassis, and eventually roll-overs become almost impossible to avoid! Well, maybe not roll-overs, but certainly just a little lie-down 'cos it's way too tired!

Bump stop mods, coil-overs, there are'nt that many real solutions!