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 2nd November 2013, 08:49 AM
Cropper Cropper is offline
Member
 
Join Date: Jul 2013
Posts: 92
Default Steering racks

Just a quick question, has anyone used anything apart from the Mk2 escort steering rack?
Reply With Quote
  #2  
Old 2nd November 2013, 09:27 AM
Enoch Enoch is offline
Senior Member
 
Join Date: Nov 2009
Location: Near Boston, Lincolnshire
Posts: 788
Default

In theory you could use any rack but it needs to have the right distance between the knuckles - ie the swivel where the track arms joint to the rack. If you were to draw a straight line from the pivot point of your top wishbone to the pivot point of your bottom wishbone the pivot points of your rack need to lie along that line. As the distance between the top wishbone pivots is wider than the bottom ones the distance obviously changes with the mounting height of the rack. If the three pivot points are aligned correctly bump steer is eliminated. The other thing is to try to keep the lower wishbone arm and the track rods at a similar angle - this also helps eliminate bump steer. In Chris's book he shows a diagram of this and gives in ideal rack length of 533mm - this is the length from the centre of 1 pivot point to the centre of the pivot point on the other side.
Other considerations are the number of turns from lock to lock, the mounting methodology and the size of the spline on the input shaft.
Hope that helps,
Dave.
Reply With Quote
  #3  
Old 2nd November 2013, 11:27 AM
loony's Avatar
loony loony is offline
Senior Member
 
Join Date: Jul 2010
Location: Kielce, Poland
Posts: 185
Default

I will use RHD Fiat Punto Mk2 steering rack - but mounted upside down and in my LHD project should work OK. The length is suitable for roadster, and is quite "quick" - 2,7 turns lock-to-lock (originally used with electric power steering at column)
Important for me - it's cheap (even in Poland, where it's hard to find RHD steering rack).

__________________
Lucas

ZX9R BEC Haynes Roadster - build cost so far: £1125
My build thread

"Whatever you can do or dream you can, begin it. Boldness has genius, power, and magic in it." J.W.Goethe

Last edited by loony : 2nd November 2013 at 11:30 AM.
Reply With Quote
  #4  
Old 2nd November 2013, 05:46 PM
Cropper Cropper is offline
Member
 
Join Date: Jul 2013
Posts: 92
Default

That sounds interesting, do you have the joint to joint measurement mentioned by Enoch?
Reply With Quote
  #5  
Old 2nd November 2013, 08:33 PM
twinturbo's Avatar
twinturbo twinturbo is offline
Super Moderator
 
Join Date: Jul 2008
Location: Carlisle
Posts: 4,389
Default

the big consideration is the mounting location, if the donor rack sits behind the centre line of the hubs then it must stay behinf ( unless flipped for a LHD<>RHD ) swappage as mentioned.

likewise if the donor is in front then it needs to stay in front.


I am not sure if the IVA actualy specifies the direction of turn for a given steering input, and as such you may get a car passed with back to front steering on a technicality.. but driving it could turn you brain to mush.


TT
__________________
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
  #6  
Old 3rd November 2013, 12:36 PM
loony's Avatar
loony loony is offline
Senior Member
 
Join Date: Jul 2010
Location: Kielce, Poland
Posts: 185
Default

Quote:
Originally Posted by Cropper View Post
That sounds interesting, do you have the joint to joint measurement mentioned by Enoch?
As I mentioned in my thread - it is about 530-540mm (hard to measure because of rubber boot)

If I am right - it should fit to chassis - I even draw some mounting plates in SolidWorks, but it's still only drawing.

First of all - I need to go back to my build...
__________________
Lucas

ZX9R BEC Haynes Roadster - build cost so far: £1125
My build thread

"Whatever you can do or dream you can, begin it. Boldness has genius, power, and magic in it." J.W.Goethe
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 09:25 PM.


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