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leaf spring rate calculator for EXCEL

Discussion in 'The Hokey Ass Message Board' started by Paul, Aug 17, 2007.

  1. Paul
    Joined: Aug 29, 2002
    Posts: 12,236

    Paul
    Editor

    alternate thread title;
    slow day at work

    flipping through my copy of Chassis Engineering I see a basic formula for calculating spring rates for leaf springs

    leaf width times number of leaves devided by 12 times 1000 times leaf thickness devided by leaf length to the third power

    and wrote this short excel formula to have a calculator on hand just in case I want to do some quick syferin'

    anybody else got any nifty excel formula?
     

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  2. enginebloch
    Joined: Feb 23, 2006
    Posts: 114

    enginebloch
    Member
    from norfolk va

    I made one that figures out optimum intake and exhaust runner length and graphs the results so you can tune your custom manifolds easier. Its based on Helmholtz Resonator equations.
    If anybody wants a copy, just shoot me a pm.
     
  3. blown49
    Joined: Jul 25, 2004
    Posts: 2,213

    blown49
    Member Emeritus

    I made one for figuring out rear end ratio required for a drag car based on desired max engine rpm at the end of the quarter mile. (Didn't want to over-rev our flatty in the HA/GR car.)
     
  4. Sour Kraut
    Joined: Jun 17, 2007
    Posts: 72

    Sour Kraut
    Member

    I have one to compute compression ratio, if you want it P.M. me. If someone knows how to post an excel file, please post instructions and I will post the file.
     
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  5. Paul
    Joined: Aug 29, 2002
    Posts: 12,236

    Paul
    Editor

    testing, attach as zip
     

    Attached Files:

  6. Sour Kraut
    Joined: Jun 17, 2007
    Posts: 72

    Sour Kraut
    Member

    Spring rate zip works, hope this does.
     

    Attached Files:

  7. Stude350guy
    Joined: Jun 21, 2005
    Posts: 561

    Stude350guy
    Member

    Thanks, everyone. When I get home I'll try to download all this. It looks like really helpful stuff. Appreciate it!
     
  8. Flat Ernie
    Joined: Jun 5, 2002
    Posts: 8,304

    Flat Ernie
    Tech Editor

    I've got one for tire diameter, rpm, gear ratio, & speed...it's clunky, but I like it.. I'll try to attach later..

    EDIT - Attached it - it's got tabs for the common early Ford rear ratios along with each of the various trans cluster ratios - you can input tire size at the top & it populates the rest of the sheet with rpm. First sheet has some various gear ratio/rpm/mph calculators
     

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  9. 40Tudor
    Joined: Jan 1, 2002
    Posts: 629

    40Tudor
    ALLIANCE MEMBER

    Here's a few that I've made over the years. I have others, but these are probably the most useful and easy to comprehend.

    Ratio - Shows relationship between road speed and rpm on a graph based on rear wheel size (accounting for tire crush), rear end gears and tranny gears. I made a table of trans gears for comparison purposes.

    Carbsize - This one was based on info from an Edelbrock catalog a few years ago. Might be useful in selecting carbs.

    Suicide tube strength - a quick and dirty one showing deflection for different diameters and wall thicknesses of round tubing.
     

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  10. Paul
    Joined: Aug 29, 2002
    Posts: 12,236

    Paul
    Editor

    'nuther super basic one
    this could be adapter for any motor,
    just change the stock bore and stroke columns to match your motor's stoke numbers

    to use this just put your desired over bore and over stroke numbers in the blue column

    and check out the new cubes in the red column
     

    Attached Files:

  11. telecaster_6
    Joined: Dec 8, 2001
    Posts: 457

    telecaster_6
    Member
    from Dorr, Mi


  12. Does this assume the center bolt (and point of spring rate measurement) is equidistant from each end?

    Of course, most MoPars have shorter spring segments ahead of the rear axle than behind the rear axle...:rolleyes:
     

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