Seeking help :How to specify a transverse leaf spring
Have an account? Register

Forgot your password?

Forgot your username?

 
Likes Likes:  0
+ Reply to Thread
Results 1 to 7 of 7
  1. #1
    I'm a grown up member now !
    Join Date
    Nov 2009
    Location
    Hampshire
    Posts
    58
    Images
    9
    Post Thanks / Like
    doctor rod is offline

    Seeking help :How to specify a transverse leaf spring

    I believe that the transverse leaf spring on my model T is both too weak and too short resulting in virtually no suspension travel. I would like to have a custom spring manufactured and would be grateful for advice on how to specify the spring. The car is running a Ford Beam axle (38.5 inches between perch centres and 48 inches between king ping centres, that seems to equate to a 37-41 Ford ?) The spring is mounted directly above the axle via perches and shackles, suicide style, with the spring mount protruding from the front of the chassis. The current spring is "reverse eye" to get the ride height low, however the spring is almost flat when under load. The axle is supported with split wishbones.

    I have had the quarters weights properly measures and I have weighed the front axle/hubs/wheels etc to estimate unsprung weight. What I am struggling with is how to specify the spring shape, size and spring rate. Or should I simply provide information to a spring manufacturer and let them work it out - although I am nervous about getting the ride height right.

    I have attached pictures showing the suspension loaded and unloaded

    Can anyone help please? Many thanks, Brian.
    Attached Images
    Last edited by doctor rod; 25-02-2010 at 20:14.

  2. Remove Advertisements
    RodsnSods.co.uk
    Advertisements
     

  3. #2
    Semi Proffessional Prat sidspop's Avatar
    Join Date
    Apr 2009
    Location
    YamYam central
    Posts
    3,489
    Images
    453
    Post Thanks / Like
    Images
    74
    sidspop is offline
    Interesting problem. No doubt if you contacted a good spring manufacturer, with all the sizes, they could advise.
    Would it be possible to get the spring re-tempered, to give it less travel.

    I can recommend Jones Springs in Darlaston, who do an excellent job at sensible prices.

  4. #3
    Off the Xmas card list kapri's Avatar
    Join Date
    Apr 2009
    Location
    Portsmouth
    Posts
    23,046
    Images
    12
    Post Thanks / Like
    kapri is online now
    Last edited by kapri; 25-02-2010 at 20:39.

  5. Remove Advertisements
    RodsnSods.co.uk
    Advertisements
     

  6. #4
    Rods 'n' Sods Junkie 100ev8's Avatar
    Join Date
    Apr 2009
    Location
    wolves
    Posts
    437
    Images
    66
    Post Thanks / Like
    100ev8 is offline

  7. #5
    I'm Not Jed Clampett stueeee's Avatar
    Join Date
    Dec 2009
    Location
    Nr. Dartford, Kent
    Posts
    2,725
    Images
    244
    Post Thanks / Like
    stueeee is offline
    There doesn't look to be very many leaves in that front spring. Getting it rebuilt with a couple of extra leaves put in would increase the spring rate if it's too weak.

    I've used a company called Brost Forge in N. London to do my leaf springs. They've always done good work with a quick turnround.
    Stuart.
    My website: Isn't working at the moment
    My Intro

  8. #6
    I'm Not Jed Clampett stueeee's Avatar
    Join Date
    Dec 2009
    Location
    Nr. Dartford, Kent
    Posts
    2,725
    Images
    244
    Post Thanks / Like
    stueeee is offline
    BTW,
    if you want to get an idea of how much difference changing the number of/thickness of/width of leaves in the spring will make, there is a handy Microsoft Excel spreadsheet macro that you can download from here that allows you to just enter the numbers: http://www.jalopyjournal.com/forum/s...d.php?t=202296

    HTH.
    Stuart.
    My website: Isn't working at the moment
    My Intro

  9. #7
    I'm a grown up member now !
    Join Date
    Nov 2009
    Location
    Hampshire
    Posts
    58
    Images
    9
    Post Thanks / Like
    doctor rod is offline
    Thanks for the advice. Can anyone suggest what sort of suspension travel I should be aiming for ?
    Thanks, Brian.

+ Reply to Thread

Quick Reply Quick Reply

Register Now

Please enter the name by which you would like to log-in and be known on this site.

Please enter a password for your user account. Note that passwords are case-sensitive.

Please enter a valid email address for yourself.

Where you live, Town\City\County etc.

Please enter your full name
This field cannot be edited once it has been completed other than via contacting the site admin. Please make sure the information is correct first time.

Log-in

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

    Similar Threads

    1. Lowering a leaf spring
      By StueyT in forum Tech Discussion
      Replies: 5
      Last Post: 20-05-2010, 19:47
    2. Replies: 6
      Last Post: 13-05-2010, 20:53
    3. Setting up a transverse rear spring??
      By crozch in forum On Topic
      Replies: 0
      Last Post: 09-05-2010, 21:16
    4. Lowering a car with transverse leaf springs
      By mgleadow in forum Tech Discussion
      Replies: 3
      Last Post: 07-03-2010, 15:44
    5. leaf spring 30s Ford
      By 32vertex in forum Stuff - FOR SALE
      Replies: 0
      Last Post: 13-02-2010, 15:49

    Tags for this Thread

    Bookmarks

    Posting Permissions

    • You may post new threads
    • You may post replies
    • You may not post attachments
    • You may not edit your posts
    •