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"Please note that the high-flow oil pumps do not raise the oil pressure, they just increase the amount of oil being pumped at the same pressure. As long as there are no clogged return passages to hold the oil flow somewhere up in the top of the engine, I can't see how increasing the flow would hurt anything. I also would guess the additional effort required to pump more volume would not be noticeable."
I think you do not understand the relationship between pressure and volume. That relationship is widely not understood so bear with me as I attempt to clarify.
If you push (pump) oil through a passage of a certain size, and measure a certain pressure before, ie upstream of, the passage, a certain calculable amount of oil will flow. Increase pressure, more oil will flow, and vice versa. Get a bigger pump--hey, get a giant 50HP pump capable of pumping 500GPM--and limit the pressure to the same certain pressure, and the same amount of oil will flow through the same orifice. No more oil will flow through a given orifice unless there is an increase in pressure.
Pressure is regulated to a maximum by a pressure relief valve in the pump. Pressure at low engine speeds may be lower than the limit of the relief valve, but adequate to lubricate the engine properly at idle.
Any engine oil passage, whether rod bearing, main bearing, hollow pushrod, nozzle to squirt gears, acts like an orifice. Unless a certain oil pump cannot pump enough oil to maintain desired pressure in a certain case, having a pump capable of pumping more volume will not cause more oil flow to critical components.
Nor is more oil flow beyond a designed requirement necessary or desirable. In fact it wastes energy which might better be directed to the wheels. Higher oil pressure beyond what is necessary to maintain needed oil flow and bearing clearance is not good, it is an energy robber.
I hope this is halfway clear.
Racing engines may be designed with larger clearances (= bigger orifices) and require higher flow to maintain designed pressure under all conditions. This is a special circumstance for purpose-built engines, that I did not see indicated in the original post.
In short, on an otherwise-stock or near-stock engine, running a high-flow pump will only rob power and will provide no advantage.
posted by 198.69.252...
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