Haynes Forums  

Go Back   Haynes Forums > Haynes Roadster Forums > Running gear
FAQ Members List Calendar Search Today's Posts Mark Forums Read

Reply
 
Thread Tools Display Modes
  #1  
Old 30th May 2019, 11:46 AM
bentovey bentovey is offline
Member
 
Join Date: Aug 2018
Posts: 56
Default Rear camber issues

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
__________________
Statistically only one in seven dwarves are happy
Reply With Quote
  #2  
Old 30th May 2019, 02:37 PM
bentovey bentovey is offline
Member
 
Join Date: Aug 2018
Posts: 56
Default

Not my photo but the same setup
http://forums.haynes.co.uk/attachmen...9&d=1559219180
__________________
Statistically only one in seven dwarves are happy
Reply With Quote
  #3  
Old 1st June 2019, 09:15 AM
bentovey bentovey is offline
Member
 
Join Date: Aug 2018
Posts: 56
Default

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?
__________________
Statistically only one in seven dwarves are happy
Reply With Quote
  #4  
Old 1st June 2019, 01:35 PM
Numplumb Numplumb is offline
Senior Member
 
Join Date: Aug 2012
Posts: 191
Default

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.
Reply With Quote
  #5  
Old 3rd June 2019, 06:51 PM
bentovey bentovey is offline
Member
 
Join Date: Aug 2018
Posts: 56
Default

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
__________________
Statistically only one in seven dwarves are happy
Reply With Quote
  #6  
Old 15th June 2019, 11:19 PM
twinturbo's Avatar
twinturbo twinturbo is offline
Super Moderator
 
Join Date: Jul 2008
Location: Carlisle
Posts: 4,389
Default

that's going to change the swing geometry though... Not sure what effect it will have.
__________________
You only get a woosh with a dump valve

Build Thread


Man Cave Mantiques



Cecil Street Auto Repairs Garage Carlisle




Build Cost £4181.65 - Last - Wheel Cylinders
Reply With Quote
  #7  
Old 18th June 2019, 07:40 PM
bentovey bentovey is offline
Member
 
Join Date: Aug 2018
Posts: 56
Default

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
__________________
Statistically only one in seven dwarves are happy
Reply With Quote
  #8  
Old 18th June 2019, 07:46 PM
bentovey bentovey is offline
Member
 
Join Date: Aug 2018
Posts: 56
Default

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
__________________
Statistically only one in seven dwarves are happy
Reply With Quote
  #9  
Old 18th June 2019, 08:19 PM
twinturbo's Avatar
twinturbo twinturbo is offline
Super Moderator
 
Join Date: Jul 2008
Location: Carlisle
Posts: 4,389
Default

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.
__________________
You only get a woosh with a dump valve

Build Thread


Man Cave Mantiques



Cecil Street Auto Repairs Garage Carlisle




Build Cost £4181.65 - Last - Wheel Cylinders
Reply With Quote
  #10  
Old 18th June 2019, 10:10 PM
bentovey bentovey is offline
Member
 
Join Date: Aug 2018
Posts: 56
Default

That makes a lot of sense I’ll measure both the upper and lower wishbones
__________________
Statistically only one in seven dwarves are happy
Reply With Quote
Reply


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT +1. The time now is 12:55 PM.


Powered by vBulletin® Version 3.6.4
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.