4 bar setup ?
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Thread: 4 bar setup ?

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    Official RnS Addict THE VIKING's Avatar
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    4 bar setup ?

    I have been mocking up my rear end to establish what I have to do with the chassis I am making and would like some advise from those that have done this before me. If you take a look at my picture you will see that the front 4 bar mount is in the vertical position this is how I have seen a lot of cars done this way on the web. I have also seen a few cars where they have the front 4 bar mount layed back towards the rear of the car. This is how I would like to do mine in order to get a little more room in the car for the seats and also to make the car floor not so box like would this be possible with the brackets I have allready ?




    Thanks

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    Lee
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    Here's a diagram that might help you.



    I certainly wouldn't lay the brackets back. The bottom row of four holes on the front and rear brackets need to be vertical so that you can raise and lower them without losing your geometry.

    BTW, what car are you building?

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    you can move em if you want.
    what will happen though is you will find the top bar wont line up with all the holes if you decide to play around with youre suspension settings as the arc will be out.

    are you going to ever alter the rear bars once built.
    brackets you have are good if you want to really fine tune but you could just get away with a simple bracket with a single hole.

    or just pick a set of holes on those brackets and build the 4 bars to match

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    Lee
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    That's probably the mistake I made with mine. Unless you're planning to continually tune and adjust your setup you can get away with simpler brackets that are where you want them as Wayne says.

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    Official RnS Addict THE VIKING's Avatar
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    Quote Originally Posted by nobody View Post
    you can move em if you want.
    what will happen though is you will find the top bar wont line up with all the holes if you decide to play around with youre suspension settings as the arc will be out.

    are you going to ever alter the rear bars once built.
    brackets you have are good if you want to really fine tune but you could just get away with a simple bracket with a single hole.

    or just pick a set of holes on those brackets and build the 4 bars to match
    Thanks for your answer wayne so if i can move the brackets back how many degrees would be the most I can move them past vertical ? And this is going to be a road car and like you say I will not be fine tunning to try and find time at the dragstrip

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    you can go back as far as you like really.you may have to redrill a hole or looking at those brackets you may get away with mounting them upside down.
    for extra lenght on the 4 bars you could turn the rear bracket around or cut it in half and swivel both bits over the rear of the axle..

    really you just gotta put in what fits.
    on mine my top bars slightly shorter than the bottom.
    fronts are slightly higher than the rear.run parrallel.
    at the end of the day i think you gotta try real hard to put a 4 bar in that wont work.

    easiest way is to work it out on paper first.just try getting the axle going up and down without any great change in angle.
    youre rear end wont move much anyway.
    make the panhard as long as possible but again if its short its short.

    not sure what youre wheelbase is but mines 82".rear works ok.bounces a little at low speeds buts settles once on the move.

    as you say its a street car not a race car.

    wayne

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    Off the Xmas card list kapri's Avatar
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    Moving the angle of the top or bottom bars will affect the way the car launches and handles.If you are never going to drag it set them up parrallel to the ground at ride height .

    Raising the chassis end of parallel four bars will promote oversteer. When set level they will give neutral to slight understeer.Beraing in mind that most rod styled vehicles have skewed roll centres and , mixed with small and large tyres will want to understeer all the time.

    Depends whether you want the ultimate that your motor can be or you'll just be happy if nothing breaks off
    Last edited by kapri; 17-05-2009 at 20:40.

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    Quote Originally Posted by kapri View Post
    Moving the angle of the top or bottom bars will affect the way the car launches and handles.If you are never going to drag it set them up parrallel to the ground at ride height .

    Raising the chassis end of parallel four bars will promote oversteer. When set level they will give neutral to slight understeer.Beraing in mind that most rod styled vehicles ahave skewed roll centres and , mixed with small and large tyres will want to oversteer all the time.

    Depends whether you want the ultimate that your motor can be or you'll just be happy if nothing breaks off

    why do you edit youre posts.
    you never mentioned understeer at all in the first one.


    will say though running big rears and skinny fronts all my car does if you corner to fast is understeer.
    must of built it wrong.

    look at all the build ups on websites or under cars at shows.youde be hard pushed to find two cars running excactly the same dimentions on the rear,and they dont seam to be crashing all the time.

    ill leave the advise to the pro,s in the future mark.
    they know best.just a shame they dont post good close up shots of there work.


    good luck on youre builld

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    Off the Xmas card list kapri's Avatar
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    Apologies, meant understeer ,now edited.

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    Are we back on ?

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