So, tell me how you really feel! :-)
Problem with your argument is that experience shows otherwise. Putting on a
set of HS2 to
replace the ZS is a long established 1500 hot rod practice. Quite simply it
works.
Triumph advocated it, and Moss still does, as does just about anyone else who
works on or
modifies 1500 engines. There have probably been tens of thousands of Spitfires
converted
to dual HS2's, with superb results.
Don't neglect the significance of the manifold being changed. The ZS manifold
is about the
worse manifold design that can be made. One would be very hard pressed to make
a worse
one. The SU manifold certainly has its problems mind you, but they are nothing
compared to
the mountain of flaws that exist with the ZS manifold. I do not know how much
of the
performance increase comes about from the manifold change, but it's certainly
part of the
equation.
Even on carburetor throat size alone though, going to a set of HS2's is roughly
a 40%
increase in carburetion. To put it in american v-8 terms, that's like going
from a 500cfm
carburetor to a 700, something most hod rodders recognize as being a good thing
when it
comes to air flow.
Trevor Boicey wrote:
> Nolan Penney wrote:
> >
> > A pair of dual HS2's isn't bad though. Especially when compared with a
>single ZS,
> > double especially when looking at the runners on the late ZS manifold (very
>small).
>
> It is worth nothing that early MG Midgets come with dual HS2 carbs
> and it is a semi-popular modification to go from that to a single
> HS4 carb. (mostly using Mini tuning parts)
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