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Old 08-06-2011, 09:04 PM   #1
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Spring Clips (Rebound Clips)

On another Thread, the subject of Spring clips (Rebound Clips) came up, and as a result of that I started this Thread.

I do not recall ever seeing Spring Clips discussed on Zukikrawlers, although they may have. I have seen comments where people have cut them off, to get more flex. I am of the belief that is not a good idea, especially on a DD. As with most things, there are compromises in the springs and their related parts. I am not at all an expert on this subject, but in doing research and with some experience I think I have a pretty good working knowledge on the subject. Anything I post here is certainly open for discussion and/or debate. I have offered some supporting links, although there are many others.

It is my understanding, the proper name for Spring Clips is Rebound Clips. To some degree, they impact the following:

Body roll - Without Spring clips, the inside wheel springs open when going around a turn. This will increase body roll. The more the leafs open, the greater the body roll.

Axle Wrap - When the rear pinion torques the front goes up and the springs want to separate (open) on the rear side of the springs. The clamps will help, by reducing how far the leafs open. Less opening, less axle wrap.

Wheel hop – The same explanation as Axle Wrap.

Spring Leaf fan out - Especially probable when wheeling. Street driving not as critical. They cannot fan out if the clips are properly installed. No clips and loose U-bolts are a disaster waiting to happen.

Springs break - Springs break on rebound, not compression, per Eaton spring (Detroit Spring) http://www.eatonsprings.com/bustings...thshrr2010.pdf


This is quoted from Eaton Springs (http://www.eatonsprings.com/atqleafspringclips.htm):



“The bands or clips, stay on the spring. The bands are called "Rebound Clips". Normally a spring does not break while it is under load. It breaks when the load is released and the spring is rebounding.”




This too is from Eaton (http://www.eatonsprings.com/atqleafspringclipsIII.htm):


“ Many think that the purpose of the clips are to keep the leaves from fanning out. While they do stop the the fanning, their main function is to hold the leaves together during rebound.
In fact the correct name of them is "rebound clips" A spring does not break when it is being compressed, it breaks on rebound. When a spring is being compressed each leaf is provided support by both the leaf below it and the leaf above it. When a spring is in rebound the leaves would separate and have any support unless there are clips holding them as a pack.
A correctly designed spring would have between 30 and 50% of the leaves between the clips. The longer the spring, the more clips. Typically the 1st 2 or 3 leaves are held together by one clip then further out 4, 5 or 6 leaves are held together with another clip. Many springs will have 2 clips to the front and 2 to 3 clips to the rear. But the number of clips, the number of leaves held by the clips are determined by the size of and the length of the spring.
As for tightness, the clips needs to be loose enough for the leaves to flex and move length wise. Too tight and the leaves would become bound and break.”

The quoted information is repeated time and again in my research. I really do not challenge it, other than to say modifications can be made, if the consequences are understood. I think most of the information is geared mainly toward street machines, and some of it not as important to a trail only Zuki.



Eaton shows three styles of Rebound Clips; Bolt on, Clinch, and 2 pc style, as in the photo below. I have seen other types, but have no photos of them. The Rebound Clips on my YJs are the Clinch type. As I recall, two clips in front and two clips in the rear of each axle.


I found this to be an interesting site on springs and related parts. It includes spring clips and what they believe are the proper clip clearances (see photo below): http://www.suspensionspecialists.com/tech0004.html#9


The bolt on style Spring Clips will allow some flex as they are installed. The clip style can be loosened to allow a little more than stock flex. If you remove the clips from the spring pack, in time the spring pack will fan out. This is especially true, if your U-bolts loosen. You could also be more subject to having some axle wrap (see above).

For more flex, you can modify the Rebound clips for more spring opening, while not having the spring fan. Keep in mind the greater the spring opening, the greater possibility of Axle wrap, wheel hop, and spring breakage, as described above. It all about compromise.



Wayne

EDIT: Per Manning, "Body roll - Without Spring clips, the inside wheel..." Not outside wheel.
Attached Images
File Type: jpg rebound clips.jpg (131.3 KB, 87 views)
File Type: jpg clip clearance.jpg (26.6 KB, 87 views)
File Type: jpg spring open-fan.jpg (50.0 KB, 87 views)
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Last edited by Reddog1; 08-07-2011 at 01:12 PM.
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Old 08-06-2011, 09:28 PM   #2
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Thanks for doing that Wayne, very interesting. I went with the 2 piece clip and tightened my U bolts hard to say which stopped the leaves from fanning out. All the pictures show all the springs clipped. My local spring guy said generally to leave the bottom one unclipped any thoughts on that? Travis
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Old 08-07-2011, 11:40 AM   #3
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It's the inside spring that is opening or in rebound in a corner, not the outside.

Otherwise decent info.
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Old 08-07-2011, 01:06 PM   #4
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Quote:
Originally Posted by Manning View Post
It's the inside spring that is opening or in rebound in a corner, not the outside.

Otherwise decent info.
I stand corrected. Thanks.

Wayne
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Old 08-07-2011, 01:16 PM   #5
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Quote:
Originally Posted by dichdoc View Post
... My local spring guy said generally to leave the bottom one unclipped any thoughts on that? Travis
I will offer my thoughts but, I don't understand "bottom one unclipped". Did your spring guy say why? It would be worth knowing.

Wayne
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Old 08-07-2011, 06:37 PM   #6
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I think he and I were talking different things. He was saying "helper" springs and I picture the bottom spring arms not touching the rest of the pack until there is a load and then they make contact. He was maybe picturing that where my fronts are all in contact all the time????
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