Oil Pump & Camshaft Gear Oiling Modification

volaredon said

I get the thicker rotor thing for volume, if the rest of the pump is otherwise the same/ relief, etc. But I thought that volume also increased when pressure is increased as well.

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That is true, but if the pump does not have enough pumping capacity (volume) it will not build pressure. The pressure relief valve will open and limit max pressure only if the pump has enough capacity. One way to see if the pump has enough capacity, is to increase engine speed, and check max oil pressure. Then increase the spring in the relief valve, and see if the pressure increases. If it does, the pump has enough capacity, if it does not, the valve is not opening and the pump does not have enough capacity.