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Terry Burtz, Calif · 01-23-2022, 10:21 PM

You cant increase the flow of the A pump just by opening up the holes or reducing the shaft diameter.
If you could we would only need one size of pumps, but with different size holes
Lawrie

Stock Model A oil pumps have a small inlet window to the gears. When the intake window is enlarged to expose more gear area, the output volume increases. Larger passages have nothing to do with volume, but they will provide less friction.

on an original engine. i am wondering why the need to modify the pump for higher flow? if the original pump with the narrower shaft is use it will fill/overfill the oil gallery which is all that is needed to oil the engine. this is why there is a oil drainback tube to take care of excess oil.
on a pressure fed engine different story.

i am wonder why the need? i see lots of discussion on oil pumps.
__________________
old ugly

but for a stock engine they must supply enough oil

or is there a problem?
__________________
old ugly

A stock Model A engine does not need a modified oil pump.
People posting on this thread are not discussing a stock Model A engine.

01-23-2022, 10:21 PM	#28
Terry Burtz, Calif Senior Member Join Date: May 2010 Location: Campbell,CA, USA Posts: 319	Re: Modifying oil pump. You cant increase the flow of the A pump just by opening up the holes or reducing the shaft diameter. If you could we would only need one size of pumps, but with different size holes Lawrie Stock Model A oil pumps have a small inlet window to the gears. When the intake window is enlarged to expose more gear area, the output volume increases. Larger passages have nothing to do with volume, but they will provide less friction. on an original engine. i am wondering why the need to modify the pump for higher flow? if the original pump with the narrower shaft is use it will fill/overfill the oil gallery which is all that is needed to oil the engine. this is why there is a oil drainback tube to take care of excess oil. on a pressure fed engine different story. i am wonder why the need? i see lots of discussion on oil pumps. __________________ old ugly but for a stock engine they must supply enough oil or is there a problem? __________________ old ugly A stock Model A engine does not need a modified oil pump. People posting on this thread are not discussing a stock Model A engine.