[EFI] Re: [EFI] Re: Building a Flow bench

[Greg Hermann]

At 5:18 PM 2/7/02, van setten, tim @ ACSSD wrote:
>        (Lurk Mode Off:)
>        Ok, I missed something here.  According to the article at
>> http://www.spiritone.com/~eoa/Cars/Flow_Bench/Flow_Bench.htm
>        A 2 1/8 hole will flow 255 cfm @ 28 inches of water column.  Now
>awhile back someone else posted that the "Rule-of-Thumb" for fuel injection
>butterflies, or air-valves, the way to size them is for every square inch of
>throttle plate area, you will flow approximately 140 cfm @ 1.5 inches of
>water column.  So, a 2 1/8 throttle plate has 3.55 sq. inches of area and is
>supposed to flow "about" 500 cfm.  The two same size holes are flowing two
>entirely different amounts of air!  Where did I miss the boat?

The orifice coefficient for a square edged, thin plate orifice is _QUITE_
different from the one for a throttle body with a rather smooth,
streamlined entry structure.

Greg
>
>        Tim Van Setten


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