Re: Oil pressure . . . normal?
The valve chamber is vented to the atmosphere via the crankcase, so once pumped oil reaches the end of the tube in valve chamber, its gauge pressure is zero.
Oil pressure between the oil pump gears and its passage to the valve chamber is due to the pumping head, a gravity head, the oil's viscosity and the dynamics of flow in a pipe. This pressure is relatively low, typically below 10 psig.
The oil pump's principal function is to deliver enough volume of oil to keep the valve chamber dams full. Oil flow to the engine's main bearings and end camshaft bearings is due to gravity and the dynamic action of the journals spinning in their bearings.
The center camshaft bearing oil supply is pressure fed by the oil pump.
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Bob Bidonde
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