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Mike Evans
September 2, 2017, 10:12pm Report to Moderator

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Next issue anyone know where I can get steering rack sizes

I need one that is about 550mm knuckle to knuckle to eliminate bump steer

Don't need power steering just a basic rack
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Nick Jones
September 2, 2017, 10:27pm Report to Moderator

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Is that longer or shorter than a Triumph one?  A Triumph one would be pretty easy to shorten.....

Nick


Nick Jones
Somerset UK

Vitesse Mk 1.5 Convertible EFI, Survivor of RBRR 2008, HCR & 10CR 2009, HCR 2010, 10CR2011, HCR 2012, 10CR2013, 10CR2015, HCR 2016 & HCR 2017.
GT6 Mk3 Roto - project in progress
Spitfire MKIV son's project now on the road as a daily driver
2.5 PI Saloon now EFI (PIe?), Engine rebuilt and running sweet.  Diff howling...... Survivor of HCR 2013 & 2014 Gone to live in Swansea

http://www.tengaston.plus.com
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Mike Evans
September 3, 2017, 9:50am Report to Moderator

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It's shorter than a triumph one, how would you go about shortening a rack??
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Nick Jones
September 3, 2017, 1:09pm Report to Moderator

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The non-drive end of the rack itself is just a simple bar with a screw thread cut on it.  Could be shortened by the required amount and the thread recut, probably best with a lathe.  Simple, quick job for a competent machinist.  The rack housing is also a plain tube at the non-drive end with a simple bush pressed into it.  This could be easily cut down and the bush pressed in further up.

Biggest pain is probably the mount stops which might need to be cut off and re-done, or perhaps just cut off if you are using alloy rack clamps (though I'd put some simple stops on to prevent any sideways slippage if the clamps loose grip).

Nick


Nick Jones
Somerset UK

Vitesse Mk 1.5 Convertible EFI, Survivor of RBRR 2008, HCR & 10CR 2009, HCR 2010, 10CR2011, HCR 2012, 10CR2013, 10CR2015, HCR 2016 & HCR 2017.
GT6 Mk3 Roto - project in progress
Spitfire MKIV son's project now on the road as a daily driver
2.5 PI Saloon now EFI (PIe?), Engine rebuilt and running sweet.  Diff howling...... Survivor of HCR 2013 & 2014 Gone to live in Swansea

http://www.tengaston.plus.com
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John Bonnett
September 3, 2017, 1:25pm Report to Moderator


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Is there any truth in the track rod threads being rolled and using a die to extend the threads causes a weakness?


La Coupe Florio 2015
https://www.youtube.com/watch?v=4-rtCbygnIM
GT6 to Spain
http://www.youtube.com/watch?v=RtFH-Q3n2Gg

Located Whiddon Down Devon
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Nick Jones
September 3, 2017, 8:14pm Report to Moderator

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Yes, I think that is true, plus you wouldn't get a full thread as the diameter is a bit too small.  However, I understood that we were talking about the centre section of the rack, between the inner ball-joints, and needing to shorten that to bring the inner ball joint to a position to minimise bump steer.

I think, but have never actually had the opportunity to measure, that the centre sections of TR2 - 6, all small chassis and the non-PAS saloons are all basically the same (6 tooth/7 tooth pinion aside) but there are track-rod length differences with saloon ones presumably being the longest.  I could be wrong about this as I've long forgotten where I saw/heard this.

Nick


Nick Jones
Somerset UK

Vitesse Mk 1.5 Convertible EFI, Survivor of RBRR 2008, HCR & 10CR 2009, HCR 2010, 10CR2011, HCR 2012, 10CR2013, 10CR2015, HCR 2016 & HCR 2017.
GT6 Mk3 Roto - project in progress
Spitfire MKIV son's project now on the road as a daily driver
2.5 PI Saloon now EFI (PIe?), Engine rebuilt and running sweet.  Diff howling...... Survivor of HCR 2013 & 2014 Gone to live in Swansea

http://www.tengaston.plus.com
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Mike Evans
September 4, 2017, 6:26pm Report to Moderator

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We'll update on the rack, after an hour of looking and tea drinking I've come up with this

The size I need was struggling to find, if I narrow the Mazda rack I will be able to use original track rods and keep original steering set up.

The Mazda rack was pas but won't be once I'm done, it's got an alloy pinion area with a steel tube pressed onto the end

The main sliding part is hollow where I want to remove material from, so plan is to cut and remove material from centre, tap a thread into both ends and screw a dowel inside before welding

Sleeve and weld up outer then make bungs to blank off pas pipe holes

Looks like I'll have enough room in middle to remove the 140mm required
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Mike Evans
September 4, 2017, 6:30pm Report to Moderator

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Nick, from research I've also read that all triumph small chassis racks are the same size, I looked at the triumph rack in detail, can't remember why I discounted it yesterday but there was a good reason, may of been location of steering shaft not sure
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Mike Evans
October 7, 2017, 7:18pm Report to Moderator

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Little update, I now have a narrowed Mazda steering rack, it's a manual rack now but will work nicely, the rack has been threaded and welded back together with a stud screwed inside it so should be strong enough. The outer steel tube has been sleeved and welded. All work carried out by coded welders and engineers so I'm happy with its strength and functionality




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