Terry Thompson wrote:
>
> To be specific, two 1.25" carbs doesn't equal a 2.5"
> carb. The circular area of the throttle disc is
> calculated as pi*r(squared). For two you'd have to add
> them then recalculate in reverse to see what the
> throttle diameter would be equal to.
>
> Two 1.25" carbs =
> 1.25 / 2 = .625 (radius)
> .625 * .625 = .3906 (radius squared)
> .3906 * 3.14 =1.226 (area of 1 throttle disc in ")
> 1.226" * 2 = 2.45" (total area of both carbs)
> 2.45" /3.14 = .78" = .883 (sqr rt) * 2 = 1.76"
>
> I rounded off a few numbers, but as you can see, the
> area of two 1.25" diameter circles is approximately
> equal to one 1.76" diameter circle.
>
> Two 1.5" carbs would equal 3.5325" of area or 2.12"
> diameter.
> -Terry
But the 2 1.25" SU's with their combined 2.12" area is still better than the
single 1.5 ZS with 1.766", right?
Joe
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