I have a Melling HP series
oil pump that is adustable for pressure... Normally I run about 50 to 55 psi on track at speed once the
oil is at temp (220 to 240 degrees)....idle
oil pressure is 30 to 35 psi at temp...
I really like this oil pump, it is a blue printed pump from Melling is under 50 bucks.... it is stock pressure and stock volume (I don't care for high volume pumps), but where the spring is, instead of a plug in the hole, it has a large Allen head screw, screwing it in or out will adjust the pressure......
Start-up, cold oil, it goes to 60 to 65 psi, as the oil warms up, pressure drops....I'm runnig Mobil I 15/50...... I have tried other oils and get within 5 psi regardles of what type/weight oil I use....
Motor is a 331 cu in stoker, 12.75 to 1 compression, turning from 3000 to 7000 rpms on track......
For a street car/motor, I would think anything over 40 psi at speed would be fine, and 25 to 30 psi at idle.....
David