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

[van setten, tim @ ACSSD]

> >        (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
> >
	[Van Setten, Tim (L-3)]  Yes, I understand that a thin plate orifice
has different flow characteristics, but does a hole flow 1/2 as much with
more pressure? 

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