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Shock Mounts On Spring Plate

Discussion in 'Center Of Gravity' started by Resurrection_Joe, Feb 18, 2004.

  1. Resurrection_Joe

    Resurrection_Joe 1 ton status

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    Is it possible, technically, to fabricate a spring plate for the rear axle with a shock mount on it and to run the shocks straight up to frame. Theres holes in my frame perfect for this, I'd only need to make the plates.

    So my question is, would mounting the shocks thusly inhibit cycling and be bad in general, or would it work, and is it better or worse than the stock setup.

    Just had the idea, you couldn't run them with rear blocks though.

    Oh and if the shock is too tall I'd make a mount higher up, I haven't done any measuring, I was just staring at pictures of my truck
     
  2. big pappa b

    big pappa b 3/4 ton status

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    Hey Joe...check these

    [​IMG]
     
  3. sled_dog

    sled_dog 1 ton status

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  4. big pappa b

    big pappa b 3/4 ton status

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    Nope..those are 14B spring plates I had made with the shock mounts on them
     
  5. sled_dog

    sled_dog 1 ton status

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    who made them?
     
  6. Resurrection_Joe

    Resurrection_Joe 1 ton status

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    Whoa, swooky, have any idea if the work well?

    Looks like that wouldnt be too hard to make, plate and drill bit, solid stock and tap

    Hmmmm, wont be able to mull the center pin slot, but I think I can pull off the leaf spring centering strips with slat stock
     
  7. beater74

    beater74 1/2 ton status

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    wa like this?


    [​IMG]
     
  8. Resurrection_Joe

    Resurrection_Joe 1 ton status

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    Yeah, is that yours? How does it work?
     
  9. BadDog

    BadDog SOL Staff Member Super Moderator Author

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    IIRC, I think Zakk copied mine. I've had mine on the spring plate for about 2 years or more. I doubt I was the first, but I've had several copy it with no reported failures. I didn’t go straight up to the frame though. I needed more than 13” of travel so I kicked the top forward to the frame at about 45*. The angle effectively lengthened the travel, and the axle goes forward as it goes down, so it moves toward the top mount, effectively lengthening it even more. I still use every inch of it, but the rate is still high enough that I can run the fire roads at 40+ without trouble for 10 minutes or so before they over heat and aerate too badly to control the bounce…
     
  10. Resurrection_Joe

    Resurrection_Joe 1 ton status

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    Thanks!

    I think I'll go with that then.

    I looked at pics of your truck, but I couldn't tell if you wonted them at opposite angles or in the same direction.

    Think a like-gm-setup would help with axle wrap and whatnot?
     
  11. Muddytazz

    Muddytazz 1 ton status

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    I made the ones that big pappa b posted for his 14FF /forums/images/graemlins/waytogo.gif
     
  12. BadDog

    BadDog SOL Staff Member Super Moderator Author

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    I think the help with axle wrap is negligible at best, especially with the gears and tires we run. Use a wrap bar for that, both of my shocks run forward...

    There should be some pics of my plates floating around somewhere. If you can’t find something that shows them clearly, send me a PM and I’ll upload some for you. Mine are really simple and strong, but built on the ¾ ton spring plates…
     
  13. Hossbaby50

    Hossbaby50 3/4 ton status

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    Russ,

    How many degrees did you kick your shocks forward? Did you compensate for this angle in your lower mounts? Or did you weld the lower mounts on at a 90* angle? Did you just use 1/4" plate for your lower mounts? I am looking to copy yours for my truck and was wondering what would be the best angle. I think I am going to try and use the Ford F250 towers for upper mounts. Any words of advice on angle, shock length, etc?

    Harley
     
  14. Greg72

    Greg72 "Might As Well..." Staff Member Super Moderator

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    [ QUOTE ]
    IIRC, I think Zakk copied mine. I've had mine on the spring plate for about 2 years or more. I doubt I was the first, but I've had several copy it with no reported failures. I didn’t go straight up to the frame though. I needed more than 13” of travel so I kicked the top forward to the frame at about 45*. The angle effectively lengthened the travel, and the axle goes forward as it goes down, so it moves toward the top mount, effectively lengthening it even more. I still use every inch of it, but the rate is still high enough that I can run the fire roads at 40+ without trouble for 10 minutes or so before they over heat and aerate too badly to control the bounce…

    [/ QUOTE ]



    Russ,

    I can tell you for a fact that Zakk didn't copy you..... since I'm the one who built his setup. /forums/images/graemlins/thumb.gif

    Honestly, at the time he asked me to design a rear shock hoop setup I didn't really do much looking around for ideas online. I knew how much shock length I had to fit (a LOT) and I knew that with the Springer setup that there would be a lot of articulation, so it was very unlikely that I'd be able to mount the lower shock mount outboard of the springs (which is always my preferred solution when it's possible! )

    The more I looked at the available space, and the fact that the hoops were going to be directly above the framerails.....the lower mounting point became sort of obvious (and the only available option really)


    However, it you want to claim a copyright infringement.....I'll see you in court sucka!!!! /forums/images/graemlins/rotfl.gif
     
  15. BadDog

    BadDog SOL Staff Member Super Moderator Author

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    I don't recall exactly what the shock angle was set at, but that will be controlled by what shocks you have and the rate you want, so my angle won’t help much. The lower mounts have the pivot pin more-or-less parallel to the axle tube from over head so the angle is not an issue there. I did that to allow rotation to deal with the constant angle changes as the suspension cycles. I didn't like the idea of the bushing soaking up all of that deflection. Only problem is, this means the bushing has to soak up the articulation angle. Since my axle swings down and under when articulated, and the angle on droop changes quite a bit, I set the pin tipped up rather than parallel to the axle. Unfortunately, I gave it about twice as much as I should have and it binds a bit at ride height while having no bind at full droop. I've thought a few times about building a goofy shackle type of thing (like I've got on the front) to take some load off the bushing. As for angle and shock length, it depends on how much room you have, what shock rate you want, and what you’re after. Can’t help much there except to say I would go for the most travel possible within your other parameters (Capt Obvious strikes again!). /forums/images/graemlins/laugh.gif

    For what it's worth, here are my upper and lower shock mounts. They have been like this since I chopped off the back of the frame and have not yet shown any signs of damage, bending or other problems. The lower mount looks like the gusset is bent, but it's just shaped (ground) like that to clear the nut. Hope this helps...
    [​IMG]
    [​IMG]
     
  16. BadDog

    BadDog SOL Staff Member Super Moderator Author

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    Greg, sorry, didn't mean to take credit where not due. I just thought I remembered a thread where I commented on Zakk’s new shock mounts (that they looked familiar) and he said the my mounts had been the inspiration. /forums/images/graemlins/ignore.gif

    In any case, your reasoning is almost exactly parallel to mine when I set them up.

    But I'm still claiming "prior art"! /forums/images/graemlins/tongue.gif
     
  17. Greg72

    Greg72 "Might As Well..." Staff Member Super Moderator

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    [ QUOTE ]
    Greg, sorry, didn't mean to take credit where not due. I just thought I remembered a thread where I commented on Zakk’s new shock mounts (that they looked familiar) and he said the my mounts had been the inspiration. /forums/images/graemlins/ignore.gif

    In any case, your reasoning is almost exactly parallel to mine when I set them up.

    But I'm still claiming "prior art"! /forums/images/graemlins/tongue.gif

    [/ QUOTE ]



    Alright then......you can take it up with my legal team (Johnny Cochran, and F. Lee Bailey)

    Given what they were able to do for OJ, I figure you don't have a prayer!! /forums/images/graemlins/yikes.gif
     
  18. az-k5

    az-k5 1/2 ton status

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    Jonny will just lay out the truggy card and say truggy fab does not fit in full bodied work. "If the parts don't fit you must aquit" /forums/images/graemlins/histerical.gif /forums/images/graemlins/histerical.gif

    Back to the shocks... How much is the dampening changed by the angle? as well as the heat issue? Is this a DD mod or not is basically wear I am getting at.
     
  19. Greg72

    Greg72 "Might As Well..." Staff Member Super Moderator

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    Check in "The Garage"....I think someone posted the formula for calculating shock effectiveness vs. angle.

    IIRC it basically comes down to figuring out how much of the force is being directly applied into the piston vs. how much "side loading" is happening. It's probably some sort of force-vector thing where straight up and down = 1 and laying the shock 100% sideways would = 0, and the angles in between are calculated in some sort of SIN, COS, or TAN between them's two values!!! /forums/images/graemlins/thinking.gif
     
  20. BlazerGuy

    BlazerGuy 3/4 ton status

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    [ QUOTE ]
    "If the parts don't fit you must aquit"

    [/ QUOTE ]

    HAHAHAHAHAHA /forums/images/graemlins/histerical.gif
     

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