25.5 Imperial gallons/hr, 115.92 litres/hr, 1.932 l/min.
(According to John Hudson, it was: "26 gallons per hour at 6,000 RPM")
Thanks, LAB, for that subtle update: ..... of course it is Imperial gallons. Also, thanks for the 6 start/ 3 start picture.
Then, if we use Hudson's data, the flow at 3000 rpm (which is most likely crankshaft rpm) computes to 0.97 L/min. This is close enough to the data source I quoted earlier of 1.0 L/min. Since the scavenge side of the pump has gear length twice that of the pressure side, the scavenge flow rate is expected to be 2 x 0.97 = 1.94 L/min..
UPDATE: Using Richard Tool's measured gear length data, the expected scavenge flow rate is 1.00 x 0.405/0.250 = 1.62 L/min, or if we are not picky, 0.97 x 0.405/0.250 = 1.57 L/min
@TomVachon
If you wish to compare your results to that of Lab's sources, you will have to account for the relative rpm difference between the crankshaft and the pump shaft. In this regard, it does not matter which set of drive gears you have, just so you relate your measured flow to a calculated crankshaft rpm relative to your drill (pumpshaft) rpm.
Slick