High oil pressure?

[Bonks]

Oil pressure query/concerns:
I’ve recently acquired a 1934 EB65. The engine was replaced in 1954 by Cambridge Engineering. Engine number is 212402. (Dec 1934) 
Vince Leek fully rebuilt this late 2000 which included Phoenix crank 15/16”, Taiwanese pistons and several other performance modifications.
It’s also reported the oil pump is modified, extended, bored by 1/32” and vane moved further off-centre. It has also been fitted with an oil filter (mini)
The previous custodian Ray Liddon passed away before he fitted a 0-20 psi oil gauge (shows he purchased one on one of the many receipts). The gauge it came with 0-10 psi & always depicts the reading off the scale. I believe it may have dropped to about 8psi on idle on a recent run.  Ive recently acquired a 0-20 gauge. When cold the needle is off the scale and comes down to about 8ish when warm (although this was just running in my drive for about 10-15 mins so perhaps not properly warmed up) reving the car and the gauge goes up like a rev counter to 18-20 psi (again in my drive after about 10-15 mins running). Is this pressure normal/to be expected for this type of oil pump mod? 

[Steve Jones]

Yes, seems perfectly normal for the pump you describe and that spec engine. 10 - 15 minutes idling will not get the oil anything like properly warmed through.

Steve

[Bonks]

Thank you Steve,
I’m used to a mag engined Chummy idling about 2 psi and high revs about 5psi.

Best wishes,

[Chris KC]

It's hard to say what the pressure should be without comparing an identical set-up, but my 3-bearing pressure fed engine typically run at 40-50 psi on the road and maybe 25-30 at idle. 

The last one I rebuilt with an increased offset pump was clocking 80 - 100psi at cold start.
(I maybe need to re-think the PRV...)

[Terrytuned]

Overbored Austin oil pumps on splash fed usual run at 10lbs when warm and upto 25lbs cold don't over rev when cold. Terry

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You can make an adjustable oil pressure relief valve from a std valve, the valve and spring on left is for a high pressure pump the ball and spring can be used with any pump with a std or stronger spring. Terry [attachment

[Bonks]

Many thanks for this Terry,

Regards, 
Bonks.