"Do the maths. A 2inch Su is 50.8mm. You can have 2 or 3 of them."
We have HD6s, which are only 1.75in (44mm) for 2 or 3 cylinders, if You fit
a 45dcoe, You will DOUBLE, that. Bigger is not always better. You need gas
velocity for a good, stabile mixture.
As a guideline, one 1.75 SU is enough to feed 90-95 hps, and even good up
to 100 with not much loss. Our Healey is very overfed with the stock engine
and 2 HD6s.
Gergo
2013/12/5 Chris Dimmock <austin.healey@gmail.com>
> I have triple 45DCOE webers. With 34mm chokes. (34mm is 1.338 inches, and
> you
> get 6 chokes with triple webers).
> Do the maths. A 2inch Su is 50.8mm. You can have 2 or 3 of them.
> Plus you get almost infinite adjustment with webers.
> Triple 45's with 34mm chokes are fine for a road car. Probably 36's too.
> 38's
> on a full serious high rev race engine.
> But your definition of road car might be different to mine.
> I've never seen triple 40DCOEs on a Healey. The magic barrel dia formula is
> choke x 1.25 So a 40mm Dcoe can't be the correct answer, even with 34mm
> chokes...
> Best
> Chris
> Sent from my iPhone
>
> > On 5 Dec 2013, at 4:40 pm, Wilko2 <e-wilkins@cox.net> wrote:
> >
> > I've not even finished building my engine yet (15 years on...)
> >
> > I was wondering about Weber Carbs for a street driver Healey and about
> the
> > 45DCOE being used for all the kits and such.
> >
> > Weber recommends a 40 DCOE and supplies them with 32mm chokes for many
> very
> > successful 2 liter cars. That's a 40mm carb with 32mm choke for each 500
> cc
> > chamber. Why then would a Healey need a 45 with a 35mm choke?
> >
> > Am I going to be ok for my moderately-built 3 liter Healey using the 40
> DCOE
> > with 32mm chokes?
> >
> > Thanks,
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