Randall's data shows that it's many more cars than I had imagined. I would
enjoy seeing some good market sizing analysis to see how many 4/4As are
still on the road with SUs. I have to imagine that the attrition rates are
quite high due to scrapping, parting out cars, and re-exportation.
ISTR reading, perhaps in Mike Cook's, TR in America book that S-Z's were
equipped because a rival firm had purchased SUs, but don't hold me to that,
please, as I've been way too busy to read much about TR history lately.
Ted
On 9/26/05, Randall <tr3driver@comcast.net> wrote:
>
> > Does anyone have an idea of the history and population size of
> > the TR4A with
> > center pull throttle rods and springs, used with SU/HS6?
>
> The information I have is that the conversion to HS6 happened at CTC62191,
> and the last TR4A was CTC78684. So assuming continuous numbers, just
> slightly over 16,000 cars originally had HS6.
>
> How many of those are still on the road, I wouldn't know. But it's a
> somewhat popular conversion for the earlier cars, so I would guess that
> there are a lot more HS6 setups running around than there are late TR4A.
> There's a pair hanging on my garage wall, currently planned for my "new"
> TR3.
>
> > The TR4A came in with the Z-S because of supply issues, I believe.
>
> The ZS actually started mid-TR4, CT21471E according to the Moss catalog,
> making roughly 18,000 TR4 and 12,000 TR4A equipped with them.
>
> I vaguely recall reading somewhere that the SU-ZS switch was for cost
> reasons, and the subsequent ZS-SU was for supply reasons, but I could
> certainly be wrong about that.
>
> > Then came back in at the end of the production run with HS6 and center
> > pulls???
>
> Better yet, the TR250, TR6 (non-PI), TR7 (non-PI) and Stag all had ZS
> carbs
> too. They evolved over the years of course, mostly for emissions, but it's
> the same basic design.
>
> Note that HS6 throttle shafts turn backwards to H6 ...
>
> Randall
--
T.L.L.
1966 TR4A CTC 73139 LO
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