Oil pump capaacity - table or calculation 1

[Rink]

I'm looking for a table or calculation that will allow me to determine the volume flow rate of an automotive gear-type oil pump. I'm guessing that I need gear pitch. diameter, length and pump RPM. Anything else?

Thanks,

Rink

 

[EngJW]

(2Pi x pitch dia x addendum x length x rpm x efficiency)/231

Input units are inches, output is gpm