I have observed Kevin Wayne Williams <kww@gte.net>'s posting which said:
> At 09:33 PM 2/22/2004 +0100, Robert Greenfield wrote:
>
> >A heavier dashpot spring would enrichen the mixture, but probably at all
> >rpm, although I can imagine that it would enrichen more at lower rpm.
> >I hope that the data exists somewhere - I've seen adverts from the 1950s
> >for Shorrocks superchargers with Morris Minors in the picture!
>
> "Heavier dashpot spring" was the wisdom of the world, so I gave it a shot.
> The dyno will have to wait until next week, but the preliminary tests with
> a green dashpot spring were very good. Low end performance is back. The
> yellow spring (8 oz) wasn't much help. Top end may be just a notch off, but
> some good needle selection at the dyno will probably take care of that. The
> only noted problem was that if I stomp on it when I am already climbing a
> hill at 70MPH, it runs rich enough to put a cloud of grey out the pipe.
> Very few Minor pickup owners can even dream of running the test.
Sounds quite successful already.
> All told, this makes sense to me. A 1 3/4 carb is a lot of carb for a 948,
> even with a supercharger.
Indeed!
My 2.6L Morris Isis originally had only a single 1 1/2 inch SU...
> The green spring fights the piston rise at the
> bottom, and gives me some air velocity back. Even if the green spring keeps
> the piston from rising clear to the top, a 948 is never going to demand all
> the air that this carb can flow.
You've put a lot of thought into this, I can tell!
Even a 1098 has a 1 1/2 inch as standard (if I recall correctly)
--
Robert Greenfield
'54 Cowley
'56 Oxford
'58 Isis
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