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
> was a noticable difference with the HS2's. The
> two 1.25" (total of 2.5")
> SU's breaths much better than a single 1.5" ZS.
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