KJ's rock rails, DIY-style

Discussion in 'Fabrication' started by Dmut, Oct 27, 2010.

  1. Dmut

    Dmut Full Access Member

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    my custom-made rock-rails for KJ.
    since I made them for riding in wild and don't "wearing" them in the city, they was engineered with idea to make install-deinstall time short, it takes only 5 minutes to put them on.
    Also, crossbars are a bit long, because I use hi-jack to lift KJ by these rock rails.
     

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    Last edited: Oct 27, 2010
    Gavin Challinor likes this.
  2. ridenby

    ridenby Gold Supporter

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    Nice rails.
     
  3. JeepINgeek

    JeepINgeek Silver Supporter

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    im going to call those a win! good job
     
  4. Dmut

    Dmut Full Access Member

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    Thanks guys! Custom-made steel roof-basket for KJ is on the way )))
     
  5. bmrrwolfe

    bmrrwolfe Full Access Member

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    I also like how they look, and that they are simple to remove!
    Although I think if I had a set of rock rails, I would keep them on, just to keep shopping carts and car doors away! rofl2.gif
     
  6. Dave

    Dave Administrator Administrator Moderator

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    Really nice job.

    Dave
     
  7. yellocoyote

    yellocoyote Administrator

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    Do they bolt to anywhere on the frame, or just the pinch weld on the rocker panel? Can't tell from your photos.
     
  8. tommudd

    tommudd Moderator Staff Member Moderator

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    Look Ok for light use like the stock rails see, need more bracing and bolt on better to attack the serious rocks and tress though
    But if they work for you thats all that matters isn't it
     
  9. bmrrwolfe

    bmrrwolfe Full Access Member

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    It looks like it just has studs that go into factory holes in the subframe?
     
  10. Dmut

    Dmut Full Access Member

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    yes, these rock rails are hard-bolted only to pinch wield,
    Studs on the end of crossbars just inserted to factory holes, no nuts there. Those bolts-studs are big, like M12, so they don't move inside chassis holes. overall construction is quite sturdy.

    Good point ))) Those shopping carts could be really nasty, sometimes )))

    right.
     
  11. tommudd

    tommudd Moderator Staff Member Moderator

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    Thats putting all of the stress on the pinch weld. doesn't matter if you have something just sticking back into the frame. You maybe able to say lift it straight up right there, but when you hit rocks and trees etc its not always a straight up or down hit.
    Also more bracing at angles will help prevent it from bending if say hit straight on from the front or rear.
    Just trying to be helpful with suggestions from what has been seen as weak areas
     
  12. Dmut

    Dmut Full Access Member

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    Thanks for your input, tommudd.

    nope. see picture.
    when you had hit a rock or just using hi-jack - the red point goes up. black point stays steady (because of big studs are sitting tight), so green point presses up to subframe, which is hard enough to take a weight of vehicle.

    small nuts on wielding pinch are basically holding the weight of rails and not letting big studs leave their holes. they don't take any much stress.

    Am I missed something?

    Regards,
     

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    Last edited: Oct 28, 2010
  13. rockymountain

    rockymountain Full Access Member

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    What would happen if you tied a rope to the rail and pulled it out perpendicularly? Rip it off with the pinch weld?

    Just wondering. If you hit rocks the force could go up against the rail in any direction.
     
  14. Dmut

    Dmut Full Access Member

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    if you start pulling it hard straight horizontally, or even lower horizon, then yes. pinch wield will be ripped out.
    but I hardly imagine this situation in RL. you most like will have some angle up, and in this case, rail with small bolts will press against the wielding-to-subframe angle, and nothing bad will happen, I believe =)

    anyway, my rock rails construction is definitely not the smartest nor most solid one out there, but it do the trick for me - it's light and fast attachable, and I can use a hi-jack with it =)
     
    Last edited: Oct 28, 2010
  15. Warren.fischbeck

    Warren.fischbeck Full Access Member

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    The largest issue I see, is when you are stuck on a rock and you start dragging the rail across it, you are going to get hung up on the support that runs back to the frame... there's no angle piece to let the rock ride over the support.

    Never mind I just looked at the pic again and the rail is under the supports... I must be getting old.
     
  16. Dmut

    Dmut Full Access Member

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    But you have a point - if rock will stuck not on main rail but nearby of green point - then it will press against support (crossbars) and car will stuck. rare situation, but possible.
    Well... I guess, full-length skid-plate from subframe to big rail will do the trick, but it will be so heavy and bulky...
     
  17. yellocoyote

    yellocoyote Administrator

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    There are plenty of real world situations (particularly if you offroad) where these could bend/damage your pinch weld. Specifically in recovery. The pinch weld isn't a very sturdy anchor point.

    If your intent is to have something compatible with your high lift for changing tires and such, then I think what you have is fine. I don't know that I would trust them in offroad situations. At the very least, bolt them to the frame for added strength.
     
  18. tommudd

    tommudd Moderator Staff Member Moderator

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    I would not even use a hi-lift on them,
    not strong enough, period.
    not knocking what you are trying to do,
    only pointing out that they need more cross/angle bracing, also need to be bolted back to the subframe.
    I can put mine against rocks or trees and spin the whole Jeep around whatever it is
    Troy ( previous owner of my rails) dropped over two foot off of a rock and it just barely put a small dent in the the outer tube. With your current setup, a drop like that they would be torn clear off. The force pushing up on the outer rail would twist it up and the part back at the frame would be pointing down. more than likey with damage to both the pinch weld and the door.
    Going around town they'll do fine. So continue on
     
  19. Pippobug

    Pippobug Full Access Member

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    Hi, any chance of measurement? I have also a KJ 2003 and as it cist a fortune to have them shippedfrom the US, any chance you have accurate maesurements to have them reproduced back here in the UK.
    Thanks,
    Fil
     
  20. Axel-ander92

    Axel-ander92 Full Access Member

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    What are your rails. I wish jcroffroad still made theirs but they don't.