oil pump question ?

AJ/FormS said

OK lets back up the bus.
Bakerlite
Are you saying that at, lets say, 3000rpm, when the stocker has not yet reached its full pumping capacity, thus not yet bypassing fluid, that the HV pump with its bigger rotors at the same 3000rpm, would be pumping the exact same quantity of oil?

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At lower RPM the smaller pump will deliver less output, in this case less than engine can accommodate. Once the pump delivers more than the engine can use it will start bypassing, and the output will be no more than the engine needs regardless of RPM. Since the stock pump will bypass (hopefully before 3000 RPM) even it is too large at high RPM. Also, since either pump can deliver more than the engine can use, engine oil demand, not pump volume will be what determines how fast the pan gets emptied. The HV pump is no more likely to empty the pan.