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  #1  
Old 30th May 2019, 10:46 AM
bentovey bentovey is offline
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Default Rear camber issues

Hi all, Iím currently building a Haynes Roadster using talons tmxr chassis and wishbones
Iím having some problems with rear camber, Iíve 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. Iím thinking that if I try to move the adjusters further out the thereís 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
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  #2  
Old 30th May 2019, 01:37 PM
bentovey bentovey is offline
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Not my photo but the same setup
http://forums.haynes.co.uk/attachmen...9&d=1559219180
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Old 1st June 2019, 08:15 AM
bentovey bentovey is offline
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So Iíve adjusted the camber to negative 1 degree which only leaves 4 threads in the wishbone. Can anyone tell me if itís acceptable to extend the threaded section by say 30-40mm?
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Old 1st June 2019, 12:35 PM
Numplumb Numplumb is offline
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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.
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Old 3rd June 2019, 05:51 PM
bentovey bentovey is offline
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Thanks Mick. I think what Iím 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 doesnít work Iíll adopt your idea and move the mountings
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Old 15th June 2019, 10:19 PM
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twinturbo twinturbo is offline
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that's going to change the swing geometry though... Not sure what effect it will have.
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  #7  
Old 18th June 2019, 06:40 PM
bentovey bentovey is offline
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Quote:
Originally Posted by twinturbo View Post
that's going to change the swing geometry though... Not sure what effect it will have.
Which? Moving the brackets or lengthening the adjusters
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Old 18th June 2019, 06:46 PM
bentovey bentovey is offline
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I thought the geometry would be set by the lower wishbones as they have no adjustment. Itís the top wishbone adjusters that will be lengthened
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Old 18th June 2019, 07:19 PM
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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.
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  #10  
Old 18th June 2019, 09:10 PM
bentovey bentovey is offline
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That makes a lot of sense Iíll measure both the upper and lower wishbones
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