Four Link Rear - to Triangulate or not to Triangulate? That is the Question. - Page 5
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  1. #41
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    Quote Originally Posted by blackpopracing View Post
    As stated a long way back in this thread the diagonal link needs to shrink/stretch on body roll. It obviously cannot do this so 2 things can happen.
    1, body will not roll as much giving an effective anti roll bar.
    2, all the forces of stopping the body roll in cornering will be placed on the bolt/bracket of the diagonal link - imagine the leverage of the weight of your car x inertia in cornering on those items - they will eventually fail.

    Panhard rod will not do any of those things - it will give smoother cornering roll, full suspension travel without stress and better body location.

    As a test, try jacking one side of your axle up only, watch how quickly the other side follows (as if you had jacked it under the diff). Now undo the track locator & repeat, see how only one side raises (side being jacked) this is how your suspension should work.

    Just because a few cars have diagonal links fitted does not mean they are the best option. In drag racing they are better than a panhard rod but drag cars do not need to corner. Plenty of show winning cars out there with some pretty awful suspension set-ups.
    You probably can't see in the picture, but the track locator has a rose joint at each end and runs on the diagonal between the front pivot on one side and the rear on the other, with the idea of minimising any bind.
    I was thinking these measures would mean either side can move up and down freely and the forces on the track locator would be similar to those on a panhard rod.

    Do I need a rethink?

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  3. #42
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    Quote Originally Posted by Ian34 View Post
    You probably can't see in the picture, but the track locator has a rose joint at each end and runs on the diagonal between the front pivot on one side and the rear on the other, with the idea of minimising any bind.
    I was thinking these measures would mean either side can move up and down freely and the forces on the track locator would be similar to those on a panhard rod.

    Do I need a rethink?
    Rose joint will lessen the bind but it won't fix the problem. The ONLY way the suspension can twist properly is if the rod can lenthen/shorten in use which it obviously cannot. Nothing you can fit will lessen the forces placed on those joints. It will work as you have built, possibly for many years as rods only do low mileages, but I've seen other rods with broken or cracked mounts after only one season.

    I'd strongly recommend you try to go the panhard route if at all possible as its the correct option for street use.

  4. #43
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    Quote Originally Posted by blackpopracing View Post
    ONLY way the suspension can twist properly is if the rod can lenthen/shorten in use which it obviously cannot. Nothing you can fit will lessen the forces placed on those joints.
    Thanks for your advice on this.
    I thought that because the track locator is rose jointed and the four bars are, they all have some freedom of angular movement, and so rather than the track locator having to lengthen or shorten any stresses would be dissipated by a small amount of lateral deflection at the nearside rear wheel.
    Is that not the case?

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  6. #44
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    No, lol.

    As I said, try jacking up one side of the axle and see what happens.

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    Quote Originally Posted by blackpopracing View Post
    No, lol.

    As I said, try jacking up one side of the axle and see what happens.
    Ill give it a try tonight. Cheers.
    I could probably recycle some of the bits if necessary.

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    Diagonal should do as panhard, just need to make new brackets.

  9. #47
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    Quote Originally Posted by blackpopracing View Post
    Diagonal should do as panhard, just need to make new brackets.
    I could cut the diagonal to length and maybe weld one of the brackets onto the chassis.
    Would just need a new bracket on the axle.

    Unfortunately, I won't get to the workshop tonight as my Mrs is a bit poorly.

  10. #48
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    Sounds like a plan, hope your mrs gets better soon.

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    Well, I eventually got to the workshop and tried moving the axle around.
    It did bind a bit, but then I noticed the track locator was fouling the bottom of the diff.

    So it looks like a panhard rod it is.

  12. #50
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    Its a better solution. Track locators also mess up your roll centres which can sometimes give 'odd' handleing.

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