Jay,
Coefficient of discharge is another way of looking at CFM per sq inch. If I say a port flows xxx CFM per sq inch we do not know if that is good or bad without knowing the depression it was flowed at. If I say I have a Coefficient of discharge of .8888 it does not matter what the depression was.
In the FLOW / IOP program that I did with David Vizard we calculate CD and let the User graph it against a different Flow test. Because we correct all flow data to to 28" of water we can also do the same for CFM per Sq Inch.
As a side note. When you have a junk head and some time track what happens to low lift flow just by increase the valve / seat angle.
Stan
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