Oil system myths

Jadaharabi said

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Another thing to consider is the thickness of the oil and the temperature.
There comes a point in time where you might want to put a higher pressure bypass spring in the pump also.
But until you enlarge the suction side of the pump it won't make much difference.

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100% agree. Pressure vs rpm will change depending on multiple factors. The operating point where the bypass even comes into play will also change because of the same.

Pickup design is also dependent on application. A larger pickup will take more revolutions of the pump before it primes vs a smaller one. But a small one will limit oil delivery at higher revs, the larger one won't. The difference isn't huge, but could matter if the owner wants to restart their engine dozens of times a day for years and years..

However, the drawback for under-delivering oil is a dead engine. The drawback of too much is a slight HP loss due to over-pumping, and maybe some windage of the oil (very dependent on actual oil used, volume of returned oil, etc).