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  1. #1
    Join Date
    Feb 2009
    Location
    ACT
    Posts
    42

    Default Leaf suspension measurements

    Hi all,

    I was researching suspension measurements for a trailer rebuild but can't find any sites that have the measurements I need.

    I want to know what the distance will be from axle to chassis. I know this will vary with load, as well as shackle length, hangers etc but can't even find a basic measurement for a leaf spring. They all specify eye to eye but no vertical measurement (even some basic indication)

    Any ideas, thanks.

    Murray
    So many ideas........so little skill........

  2. #2
    Yonnee's Avatar
    Yonnee is offline Trailer Bloke & Mild Mannered Moderator
    Join Date
    May 2007
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    Tooradin, Vic.
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    52
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    1,318

    Default

    It all has to do with the company that manufactures the spring as to what camber (the radius of the curve) they set into the spring, and the length of the main leaf. If you take two lengths of chain, one several links shorter than the other, and strung them both between two gate posts, they will each have the same "eye to eye" length (distance between posts), but each will have a different "camber". There is no "set measurement" that all companies work with, it's their own engineering practice.

    From my Spring Information booklet I've put together I have the following;

    Industrial Springworks 45 x 711mm Eye & Eye springs - 711mm centre to centre of eye unladen - 178mm Chassis to top of main leaf.

    Industrial Springworks 60mm x 33-1/2" Off-Road E/E springs - 850mm centre to centre of eye unladen - 215mm Chassis to top of main leaf.

    Industrial Springworks 60mm "Outback" E/E springs - approx. 875mm centre to centre of eye unladen - 205mm Chassis to top of main leaf.

    I put these last two in as a comparison between a shorter, but more cambered spring that will sit the trailer higher, but be slightly stiffer. Whereas, the slightly longer, less cambered Outback spring drops the trailer by 10mm, but with a slightly more supple ride.
    Too many projects, so little time, even less money!
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  3. #3
    Join Date
    Feb 2009
    Location
    ACT
    Posts
    42

    Default

    Thanks Yonnee,

    Yep, I understand different manufacturers have different sizes but can't find anything on their sites mentioning camber (thanks for the officiial term).

    Thanks for your measurements but I guess it raises more questions then about what size hangers these measurements are based on.

    My questions relate to my camper trailer. I'm tinkering with the idea of changing over my slipper springs (which have dodgy looking mounts) to something a little more 'professional' but need to keep the trailer height the same for the tent drop.

    I might email a few places. I really need the measurement from the top of the leaf to a the level of the 2 eyes. I can then add hanger distance and work it out that way.

    Cheers,

    Murray

    p.s. I appreciate all your input on this forum.
    So many ideas........so little skill........

  4. #4
    Join Date
    Jul 2009
    Location
    Quorn
    Age
    53
    Posts
    35

    Default

    Murray this may be of some help.

    http://www.industrialsprings.com.au/download/cat009.pdf

    Cheers,
    Wahoon.
    Cheers,
    Dion.

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