Hi Guys
Attached is a Mockup of my bottom wishbone and upright with adaptor for top ball joint. The Upright is Nissan Silvia (sx200) and is rear steer. The bend in the forward element is neccessary to allow the wheel to turn. The stub axle is very low on the upright hence the centre of the bottom ball joint is 230mm off the ground. The bottom pivot centre are therefor 105mm from the bottom of the chassis. Plenty of room for the rack but will mean a different layout for the chassis at the front. I'm not going to worry about that to much till I get the suspension mounting points worked out properly and will build the chassis to suit.
I must stress that this is only a mock up and the top bracket is also not finished yet.
Bruce
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Meant to attach two images.
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Hi,

are you welding the balljoint to the wishbone on your finished one?, would be a pain when you need to change one.

also, what about a steel plate inside the triangle a the balljoint end, for a bit of extra strength.

Ray

im mate i remember our old thread about this one Which was is forward? My only comments would be two fold with regard to the lower bone. Firstly, the brace at the bent bit would be better if it went straight to the bush tube rather than a few inches short (i appreciate that, if left is forwards, it wont be seeing much force and probably wouldnt fail anyway) and also, once its all put together i would try to straighten the bent arm. It might be possible to compromise the amount of lock and keep it straight. Good luck anyway.

Hi Bruce,

I dont know if this would be an improvement but at least you would get rid of that bended tube which everybody will comment on

Cheers Cita

Ooops!!
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id recommend looking in ns devs photo archive, his grasser gets plenty of lock with assymetrical bones, without the need for bends and unbraced nodes.

Thanks for the replies.
Ray, yes there will be a plate for the shocky which will be able to be mounted much closer to the ball joint than the cortina setups. The ball joint is not welded but is a press fit into a collar with a circlip, exactly as it is in the donor. The collar on this mock up is machined over size!
Joel. If you reread my text you may grasp the concept. I stated that the rack was rear steer, which means that the rack is to the rear of the bones. Why does the bend frighten you and what do you mean by unbraced nodes? I see two triangles and of course when the plate is welded in for the shock it should never bend. It will be made from shed 40 seamless tube which is just under 3mm thick. We have to do that here, where as I read you guys can use EWT tube. I see in your photo archive a picture of a bottom wishbone which I assume is on your car and it has the shock mounted on a piece of rhs welded across the end of the bone? With all the excellant posts on here re stress points created by poorly designed shocky mounts I thought this was questionable.
With all due respect to NSDev his front is entirely different. He has made a great job of his Grasser, but I can see his bottom ball joint, mine is right inside the wheel, all you will see from the same angle is the end of the wishbone disappearing into the wheel. Makes a big difference to the lock. Unlike your Cortina Uprights mine will have 10mm scrub against what, around 100mm. What's your opinion NS Dev?
Cita your right about the bend in the tube. Seems to scare the crap outer them.

Bruce Kelly

the node i refered to is in citas drawing. The bones in my archive were made 2 or 3 years ago, before i knew anything about car design, and have been scrapped recently. In fact, the whole car has.

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I stated that the rack was rear steer, which means that the rack is to the rear of the bones.

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Providing the wishbone is made from adequately strong materials I don't see any problems with the design, bar the comment that Joel made about the diagonal tube joining closer to the bush tube. With that mod it would be quite a "pure" triangulated design with the members in tension or compression. However, the success of the design could be made or broken on your intended damper mounting location.

Sorry Cita, not keen on your design, IMO there would be a large amount of bending stress at the point there the straight section joins the triangulated section.

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Originally posted by Nisseven
Thanks for the replies.
Ray, yes there will be a plate for the shocky which will be able to be mounted much closer to the ball joint than the cortina setups. The ball joint is not welded but is a press fit into a collar with a circlip, exactly as it is in the donor. The collar on this mock up is machined over size!
Joel. If you reread my text you may grasp the concept. I stated that the rack was rear steer, which means that the rack is to the rear of the bones. Why does the bend frighten you and what do you mean by unbraced nodes? I see two triangles and of course when the plate is welded in for the shock it should never bend. It will be made from shed 40 seamless tube which is just under 3mm thick. We have to do that here, where as I read you guys can use EWT tube. I see in your photo archive a picture of a bottom wishbone which I assume is on your car and it has the shock mounted on a piece of rhs welded across the end of the bone? With all the excellant posts on here re stress points created by poorly designed shocky mounts I thought this was questionable.
With all due respect to NSDev his front is entirely different. He has made a great job of his Grasser, but I can see his bottom ball joint, mine is right inside the wheel, all you will see from the same angle is the end of the wishbone disappearing into the wheel. Makes a big difference to the lock. Unlike your Cortina Uprights mine will have 10mm scrub against what, around 100mm. What's your opinion NS Dev?
Cita your right about the bend in the tube. Seems to scare the crap outer them.

Bruce Kelly

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quote:

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Originally posted by MikeRJ


Sorry Cita, not keen on your design, IMO there would be a large amount of bending stress at the point there the straight section joins the triangulated section.

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To JoelP, Sorry for being a bit nasty towards your comments, it's a bit hard to put things in words sometimes and have them sound right. I agree that the brace could go nearer to the bush and even thought about it at the time. No reason not to do that when I build the real thing. I'm pleased you rebuilt you wishbones/car, maybe you could post the new ones?

MikeRJ. Your point is echoing JoelP and is noted. The mounting point for the shock will be as close as I can get it to the bottom of the upright without it touching so should be good design wise.

NSDev. You are right. The scrub does not seem to be to much issue except I had the opportunity with having to construct a mount for my top ball joint to get it right. I didn't know what was right but from this and other forums it seemed 10mm pos seemed acceptable. The original car had about this as near as I could measure. Interestingly when I set it up in a wheel I was able to pivot the wheel on the floor and the inner of the bones hardly moved.
I've posted a few more photos to give you a better idea of how it looks attached to the wheel. I was very concerned how it would look and the photo did not really do it justice. There will be some minor shaping and trimming when it is welded but I think you will agree some black paint and the wheel around it are an improvement.

I supose I should mention that there is no disc or calliper attached to the upright and that the bottom bolt on the bracket is one of the calliper bolts.

Bruce

[Edited on 20/12/05 by Nisseven]
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Straight ahead from front
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From top at full lock
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