Madmaxx i did not say anything about a standard pressure pump. You need to read again before u respond Also
Flow rate ( I am only concerned about solid roller engine in this example)
Engine 1
Lets say u have a standard volume standard pressure pump and you have not adjusted the relief pressure and you also have an
oil cooler with 5 feet of hose. The engine idles at 10psi with 20w50
oil in it. How much
oil do u think you will get to the valve train at idle
Your relief valve is dumping the oil back in the pan due to resistance in the system, and the pump my not provide enough volume when the oil is hot.
Flow Rate
Engine 2
Engine 2 is exactly the same except it has a HPHV pump and 10w30 oil.
The oil pump and has been adjusted (Relief is set at 95psi cold oil). At operating temp the engines idles at 35psi.
Which one has the higher flow rate.
