Fino's 1970 Mini Build Thread

Discussion in 'Builds and Fabricators Forum' started by FinoCJ, Oct 3, 2014.

  1. Dec 2, 2017
    FinoCJ

    FinoCJ 1970 CJ5 Sponsor

    Denver, CO
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    Thanks - I intend to drop the the bumpstop down a bit and protect both the spring from over flex as well as protect my fender from my tire. That also meshes nicely with the range of travel for the shocks I am looking at. I can find shocks that have 8 inches or so of total travel - and the midpoint is just about right for my current height for 4" up and 4" down. Setting the bumpstops lower will also keep the shocks from maxing out compressional travel.
     
    ITLKSEZ likes this.
  2. Dec 2, 2017
    timgr

    timgr Jeepin' Nerd Sponsor

    Medford Mass USA
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    Typically when you buy a lift "kit" it will include shock absorbers that are longer than the original shocks by about the height of the lift. In that case, they intend for you to extend the bump stops by about the amount of lift to keep the shocks from bottoming before the bump stop is reached. You can measure the distance between the shock pins, the length of the collapsed shock, and the distance between the fully compressed bump stop and axle to determine whether the bump stop is low enough.

    I have never heard the story about over-extension of the springs. I know that many times the upper shock mount is raised so that the maximum axle travel can be achieved using longer shocks. The Jeepster race cars I recall had shock mounts that extended something like a foot above the (heavily reinforced) frame, and used with long Koni racing shocks with ball studs like a tie rod at the top end. I don't recall anything special about the front springs, except that they were installed with trailing shackles.
     
  3. Dec 2, 2017
    tarry99

    tarry99 Member Sponsor

    Northern California
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    Tough to see much bump (up) travel in a conventional arced lift spring unless it's something like a Holdbrook long leaf ...........or a custom YJ type flatter spring, but in either case it's still hard in a CJ to make much room above the tire so it does not hit .............plan on more droop travel than up when setting bumps and positioning shocks........you'll gain much more there.
     
  4. Dec 2, 2017
    FinoCJ

    FinoCJ 1970 CJ5 Sponsor

    Denver, CO
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    I just spent some time wondering if this was the case - been using jacks to flex to get the springs to both move up and droop. At rest, the shock mount distance is 18 inches - so if the shocks have 8.5" of travel, it looks best to have a little less up travel and a little more down travel - one that allows for 3.5 inches up and 5 inches down would be perfect. Not sure if I can find that exactly, but gives me a good target.
     
  5. Dec 2, 2017
    ITLKSEZ

    ITLKSEZ Volvophilic

    Post Falls, ID
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    This might be common sense, so forgive me, but if your shock limits the up-travel at 3.5", it's vital that you mount your bumpstop so it limits your up-travel at 3" max. Allow for a little wiggle room and extra movement through articulation. You never want the shock to bottom completely. (This includes during an accident-avoiding-panic-situation where you hop a curb, or whatever.) Your shock mounts will lose that battle.
     
    timgr and Bowbender like this.
  6. Dec 2, 2017
    FinoCJ

    FinoCJ 1970 CJ5 Sponsor

    Denver, CO
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    Agreed!
     
  7. Dec 3, 2017
    RATTYFLATTY

    RATTYFLATTY I think you need a little more throttle

    Central MN
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    What if you were to cut the top ears if the chip off? You still have the sides and a full clip to keep the springs aligned.
     
  8. Dec 3, 2017
    FinoCJ

    FinoCJ 1970 CJ5 Sponsor

    Denver, CO
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    I have a set of shims coming from Mcruff which may provide a half inch or so an the steering linkage - I need the shims to get correct caster as I am right around 0 currently, but getting some steering linkage clearance is just an added benefit. That plus whatever I can shave or cut off of the top ear (on that one side) will probably be enough. If not - then maybe a tie-rod flip.
     

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