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@neb.rr.com
> To: eyera3@gmail.com; healeys@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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