Steering rack extensions for MX5 build..

[Johno]

Hi all,
I got the steering rack extensions made as per book ages ago before I realised they were too long. Going to get them re-machined this week to suit MX5 ends from the donor. The question is how long should they be and what size thread.
The reason I ask is I haven't taken my donor to bits yet so just being lazy I guess...

thanks Johno

[Talonmotorsport]

If your using an escort mk2 rack then it's M14x2 and the mx5 track rod is M12x1.5mm if I remember correctly.

[Johno]

Thanks Talon...
Do you know roughly how long the extension should be overall from edge of thread to start of thread the other end, and yes I am using a MK2 escort steering rack...

Thanks Johno

[Talonmotorsport]

I would have thought Andy at SSC would be able to tell you the body length of the extension needed for their design, I can't open any of his drawings on my laptop. I think you need 25mm worth of male thread as a minimum as you need a lock nut on there as well.

[PorkChop]

From a PM

Originally Posted by spud69

The extensions are actually 130mm long for the main body with the M14 male thread extending about 40mm from the body. They are the same extensions as the Sierra based car. The plan soon is to re-use the mx5 track rod ends, only thing is being a jap car is the track rod threads are a queer thread so as soon as i have a die to match the threads i'll be making some extensions so that people can use the escort rack and the mx5 track rod ends.

According to http://www.locostusa.com/forums/view...hp?f=5&t=10551 the MX-5 TRE has a M12 x 1.25 thread.

[spud69]

Hello Johno,

Made some extensions up on Saturday to match the Mx5 track rod ends and 100mm long with a 30mm M12 x 1.25mm male thread and 60mm M14 x 2.0mm female the other end works just fine. The Mx5 track rod ends are longer than the sierra ones.

Hope that helps....AndyH