i know it has been covered thousands of times i have done search on it and gone through pages and pages of posts but has anybody come up with a good design on upper and lower wishbones i know that upper wishbones need 22 mm off set instead of 11 mm that the book states
but cant find any thing on the lower wishbones other than there have been failures due to position of the brace plate ( weld in the center of the tube than on top of the tube) any help please before i make them wrong as i have already done so on the bottom bones ( made to book spec ) many thanx
colin

i don't know whether you are using tina or maxi bj's but this is what I did for maxi ones, additional weld points are marked in red.
Hope this helps

Cheers

Alex
Rescued attachment bottomwishbonetest.jpg

Also, try to move the shock mount as far out as possible, as this is one of the main weaknesses, as it puts a large bending load on the bone.

Hi.

There has been so much discussion on bottom bones that I think that people are reluctant to post there designs, for fear of criticism.

Because mine are stainless I tend to think that maybe my design is non applicable for most of you.
If s/s is constantly flexed it will work harden and crack so I have increased material thickness to combat this.
Tubes are 22mm od x 2mm thick, and plate is 4mm, as are all the brackets.

The Cortina b/j has had the bent edge cut off and additional holes drilled. This enables it to be mounted under the plate rather than above.
IMHO this is stronger as it doesn't rely on the bolts supporting the weight of the car.

Having said this, if I made steel bones I think that I would still stick with the same material thicknesses.
It is my opinion that 3/4" x 16swg tube is not quite man enough. I stress this is just my opinion.

There's a pic in my photo archive but it has been posted on caster threads so you have probably seen it.

Bottom one is to the book, top has the 22mm offset.

Hope this helps.

Paul G


p.s.

Basicly, the design is the same as Alex's above for the Maxi bj's. Nice that.

[Edited on 28/1/07 by 907]

thanks all for your input this is a great site for information
cheers
colin

quote:

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Originally posted by cjthemanthere have been failures due to position of the brace plate ( weld in the center of the tube than on top of the tube)

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Should have added (and as per Paul's advice) I went bigger on the tubes 25mmOD x 2mm which is overkill probably, but as the bones are a fair bit wider than standard and as the bottom shock mount will have to be further out than is considered optimal, I went the safe rather than the Chapman route

Cheers

Alex

I went for 25mm x 1.6mm wall and a similar design to that shown above. with little fillets where the end of the arms meets the base plate

happily I had a friend who worked with a laser sheet cutter at the time.. he quit since though