The same steering rack body was used for a variety of cars ie Herald,
Vitesse, GT6, Spitfire, TR 4/5/6 and all 2000/2500. (however note early
heralds and TR4? with the solid rack mounts use a body without the plates
for the rubber mounts, and these same early racks have some strange parts in
them). After around 1962 I think they were all commonized, obviously LHD and
RHD are different and a variety of lengths and size of steering arm are
fitted. The rack is also I think the same each time (and also RH and LH
drive) and this was used in the 1300FWD as well. Now to go with this rack
are either six or seven tooth pinions, with the quicker seven tooth one
fitted to Herald, Spitfire and Vitesse 1600, (don't know about TR4), (again
RHD and LHD are different). In the Herald/Spitfire cars this gives 3 3/4
turns lock to lock and the six tooth gives 4 1/4. Other cars have less turns
lock to lock as the total movement is restricted. What this all means in
practice is that fitting a Spitfire pinion to a TR6 gives a quicker ratio.
John Kipping
----- Original Message -----
From: <mporter@zianet.com>
To: <Gt6steve@aol.com>
Cc: <rjl6n@cstone.net>; <FOT@autox.team.net>
Sent: Thursday, June 27, 2002 2:58 PM
Subject: Re: STEERING RACKS
> Gt6steve@aol.com writes:
>
> > I was under the impression that the Spit Rack was quicker than a GT6
rack and
> > now I'm struggling to remember where I read that.
> >
> > Let's see, owners manuals
> > 69 GT6+ 4.25 turns Lock to lock? Bentley P 57
> > MK III GT6 4.5 turns Lock to lock Bentley Pg. 87
> > Spit 1500 3.75 turns lock to lock Repair operations manual
> >
> > My TR Haynes manual doesn't list the spec but I bet we've got enough
Bentley
> > manual or owners manuals in this group to build an accurate table.
> >
> > Anybody else care to look it up and contribute the "book " ratio? Which
may
> > or may not be accurate depending on build year variations but at least
it'll
> > be an interesting comparison.
>
> Here's what else I can find so far of the cars using rack & pinion
> delivered to this country (Steve's figures for the cars above are correct,
> best as I can determine):
>
> Stag: 3.00
> TR4: 2.50
> TR4A: 2.50
> TR6: 3.25
> TR7: 3.87
>
> Cheers.
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