oil pressure

famous bob said
any body got any idea how to drop upper and cold start oil pressure , "with out" , dropping the hot idle pressure ????????????????????????????????????????????????????
Not loose bearing clearances, single line system, 7 qt alum. pan , full time restricted oil to the top end , hi volume pump.
AROUND 20 POUNDS AT HOT IDLE @1150 RPM : 95 ON COLD START UP.
Finally got under it and looked for my oil leak that I thot was my girdle to block seal, turned out to be the oil pressure looks like it over comes the filter gasket at hi rpm >???????

If you're running a high volume pump, you should be getting plenty of flow to your bearings, especially since you've restricted oil flow to the top end.

FWIW, the Hemi oil spring (PN 2406677) is rated at 75 psi. My DC Racing Manual recommends 50 psi up to 5000 RPM plus 10 psi for each additional 1000 RPM increment of crankshaft speed so your oil system now good to 9500 RPM.

famous bob said
I have ran 20w50, and now have 10w40 in it .

With a 40 grade oil (ie, 10W-40) and a high volume oil pump, I would expect that your hot idle pressure would be well above 20 psi. I get 40-50 psi at hot idle with the original 200k+ mile oil pump in my slant six with 10W-30. Running high pressure with a high volume pump unnecessarily stresses your oil pump's drive gear.

famous bob said
I have the hi volume pump spring shimmed to get the hot / idle pressure to what it is, thus the hi cold start up pressure. ONLY run mopar filters, and have had to tighten them a hair more than normal on install. , just forgot to this time. I used to run Phillups troparctic 20w40 in my new 68 barracuda back in the day, but haven`t seen any for yrs., would not be vmuch diff. than 20w50 I just took out , because of colder weather!

Shimming your oil pump's relief valve spring will not help your hot idle pressure. The oil pump is obviously what generates the flow and the developed pressure is the result of downstream flow restrictions. The relief valve prevents the pump from building excessive pressure resulting from high flow and/or high viscosity fluid friction. See Engine Wear.

Are you sure that you don't have loose bearing clearances?