Jeff,
It's square inches, my friend. Get out the old pi r squared and figure
the square inches in the duct cross section. Then compare that to the
square inches of the inlet opening.
Jeff
JEFF ROBERTS wrote:
> Hi All,
> While I have Gold Rush in for the winter annual I'm considering some
> cowl changes. Including closing off the upper NACA use for induction air
> on the 912-S and using the lower starboard NACA normally used for the
> 914 induction. I seem to remember someone else using that for carb
> intake and under cowl carb heat. I'm going to use the same air plenum
> with the same filter as now but I will fabricate a side intake to attach
> to the top of the plenum and a 2 inch scat tube coming up from the below
> NACA. My question is this. I already have the inlet plumed for this 2
> inch tube and not a lot of room to increase it to 3 inch. My concerns is
> if the 2 inch would be enough for both carbs. Has anyone else done this
> with the 912-S and if so what size of tube did you use?
>
> Best Regards,
>
> Jeff R.
> A258 - N128LJ / Gold Rush 175 hours and climbing slowly cause this
> winter if frickin could & wet for Tennessee ;o(. Must be al's global
> warming!
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