Rear camber issues

[bentovey]

Hi all, I’m currently building a Haynes Roadster using talons tmxr chassis and wishbones
I’m having some problems with rear camber, I’ve attached the mx5 rear hub to the wishbones with the top adjusters half way out, put the shock and wheel on and have 5 degrees of negative camber. I’m thinking that if I try to move the adjusters further out the there’s not going to be enough thread left to hold them in place.
Has anyone else had this problem? If so how was is rectified
Many thanks
Ben

[bentovey]

Not my photo but the same setup
http://forums.haynes.co.uk/attachmen...9&d=1559219180

[bentovey]

So I’ve adjusted the camber to negative 1 degree which only leaves 4 threads in the wishbone. Can anyone tell me if it’s acceptable to extend the threaded section by say 30-40mm?

[Numplumb]

Hi my wishbones were made by Talon for Haynes chassis with alterations to Saturn plans, they must be different from yours though because I only have adjusters on the bottom wishbone.
It seems to me that only having that small amount of thread would be dangerous.
Can't you move the wishbone anchor points out?.

Regards Mick.

[bentovey]

Thanks Mick. I think what I’m planning , before I start chopping off mounting points is make a longer set of adjusters (maybe 100mm of thread) and see how that goes. Then if that doesn’t work I’ll adopt your idea and move the mountings

[twinturbo]

that's going to change the swing geometry though... Not sure what effect it will have.

[bentovey]

Originally Posted by twinturbo

that's going to change the swing geometry though... Not sure what effect it will have.

Which? Moving the brackets or lengthening the adjusters

[bentovey]

I thought the geometry would be set by the lower wishbones as they have no adjustment. It’s the top wishbone adjusters that will be lengthened

[twinturbo]

It's more complex, get some card and paper fasteners and you will see.

If both arms are the same length then the the movement of the hub will stay paralel. and the camber of the wheel will not change relative to the chassis.

But if one arm is shorter than the other you will begin to create an ARC, it may be minor and of no consequence. but the wheel camber will alter as the suspension is loaded. This is not necessarily undesirable, and may be part of the original haynes suspension design.

[bentovey]

That makes a lot of sense I’ll measure both the upper and lower wishbones