[Healeys] which carb set up?

[WILLIAM B LAWRENCE]

Ooops! let me try that again. I was assuming HS6s on the tri-carb, but they
are only 1.5 inch carbs. By my calculation the twin HD6 carbs would have an
area of 4.8 square inches, so the three HS4s still have a marginally larger
area. I guess I was right in spite of myself.
Bill lawrence

> From: ynotink at msn.com
> To: glemon at neb.rr.com; eyera3 at gmail.com; healeys at autox.team.net
> Date: Wed, 17 Mar 2010 00:07:53 +0000
> Subject: Re: [Healeys] which carb set up?
>
> My understanding was that the only reason the Healeys went to the tri-carb
> configuration was because, they would then be able to fit three Webers on
> their rally cars. Three carburetors was three carburetors to the rules
> committee. They also provided an advantage over the twin HD6s used on the
> earlier cars as shown by your calculation, but at the cost of added
> complexity. It didn't take them long to revert to two.
> Bill Lawrence
>
> > From: glemon at neb.rr.com
> > To: eyera3 at gmail.com; healeys at autox.team.net
> > Date: Tue, 16 Mar 2010 18:18:28 -0500
> > Subject: Re: [Healeys] which carb set up?
> >
> > Area = pi *r * r  (pi times radius squared)
> >
> > 1" x 1" (radius squared) x 3.14 (pi) x 2 (carbs) =  6.28" sq. in. for
double
> > 2" carbs
> >
> > .75" X 75" x 3.14 x 3 = 5.30" sq. in. for triple 1,5" carbs
> >
> > This is of course the theoritical "maximum pipe" for airflow, actual will
> > also be affected by the throttle plate and such, but theortically the
double
> > 2 inchers can flow almost 20% more air.  Of course the triples give you a
> > straighter shot to the ports, I suppose there is a reason older high
> > performance engines like Ferrari and such often had an intake carb barrel
> > for each intake port.
> >
> > But it doesn't look like you lose anything, and may actually gain, with
the
> > double carb set up.
> >
> > Maybe some of the racer boys can pop in with some real world experience.
> >
> > Greg Lemon
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