Chev 216 Oil Pressure

[Ken Thomas]

I am not sure what model Chev motor or oiling system you are referring to. I am referring to the output PSI of the oil pump and this PSI is determined by the relief valve which is integral to it and is irrelevant to anything further down the oil lines i.e. nothing can happen further down the lines to increase the pressure. It would seem that I either have a faulty relief valve OR as has been noted in this thread and is discussed in other Chev club pages etc. that a 216 motor with a new oil pump, ground crankshaft and cam shaft and all new bearings (all slippers, so the clearances should be correct) will give a PSI of 30 to 40 with a drill test driving the pump and even in an on road test. This decreases as the motor warms and "runs in". It appears to be understood that the "tightness" of the motor i.e. causing restriction to oil flow through the bearings, overcomes the flow capacity of the relief valve and it cannot bypass the volume of oil so that the PSI rises from 15 to 30+. Adding to this the crankshaft is not rotating in the drill test and is probably contributing to the lack of oil flow.
I will leave it now until I can fire up the motor, I should mention that the bypass filter filled nicely and there is flow to the rockers. The oil jets work well.