stock or hv oil pump

Rusty/All,

The limiting dimension on the oil pump inlet and flow performance is the "inner" diameter of the feed tube. Not the Hole in the pump. The outer diameter of the tube is restricted by the pump housing inlet hole. Now there is a limit obviously as to how thin to make the feed tube without it fracturing due to load or harmonics etc to accept a Melling Pump female inlet ID.

"In general, the flow rate increases proportional to the square of the inside diameter, hence the flow rate is directly proportional to the area of pipe cross-section. The larger the diameter, the greater flow." I'm sure we agree on this.

I found a calculator online and used .375 and .425 tube diameters as examples flowing 10 feet per second. The .375 diameter flowed 3.44 gallons per minute (GPM) and the .425 flowed 4.42 gpm. That's a one gallon increase in a minute by increasing the oil pickup tube "inner" diameter by only .050 thousands. BTW these again are made up parameters I do not know the actual dimensions.

FLOW RATE CALCULATOR

FYI,
Marion