Your
oil pressure connection is tied into the main
oil galley. It does not matter if you are running 10wt at 3 psig or 80 wt at 50 psig, the flow rate will be identicle on a positive displacemetnt gear driven pump at a give rpm. Difference between standard volume 3 gpm and high volume is 3.25 gpm. so high volume is 10% more. The gauge tap is before the
oil cooler, filter, lines not after. All factory set oil pump rv are set to releive at 60 psig, if you are below 60 psig your flow is identicle regardless of pressure. By the way your oil filter has a internal bypass set at 10-12 psig differential unless you have a high performance FL-1HP and then it is set 18-20 psig differential. If you have 90 psig you internal bypass is opening on your filter and you are bypassing you oil filter.
Quote:
Originally Posted by PLDRIVE
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.  |