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Discussion Starter · #1 ·
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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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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Discussion Starter · #5 ·
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 :tup:
 

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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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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 :)
 

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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 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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a question as youve mentioned angling the top bar down for dragracing.

never looked into this befor.

i can floor my car away from the lights and all the rear does is squat very slightly and goes off.no wheelspinning,wandering or anything that says somethings wrong.

what would be the benefit of angling the top bar down if i can put all the power through the rear as it is.

ok not a 1000 hp engine but neither are most small street cars running 4 bars.
 

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This is how i did mine , it may help or may not, 4 bars are mounted in the rear chassis to give me as much length (ohh err) as possible.
 

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I was pointed to the chassis guru stateside Art Morrisons website when I went thru my 4 link build up.

http://artmorrison.com/layout.php?y=rearclips/rearclipsfaq/&x=index

Has some amazing stuff and good reference fotos. I called my 4 link a 4 bar for a couple of years :shake: well in my 1980s magazine refs it was called both.

I went for 4 link in case I ever get too much hp :)wanker:) and need to move the 'incidence point' !? to help the launch :lol:

Oh and went panhard and not diagonal link for road use.

ta ra
JJ
 
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