My 0-320 b3b with 92 hrs now usually has borderline low oil pressure at the very edge of the green arc while at cruise rpm. I am using XC 20-50 with a screen now but the pressure was low during break in with mineral oil also. The gauges are Vans and the pressure reading is taken from the accessory case. Before I had no more than 5 hrs I added 3 washers to the prv and pressure increased from 55 psi to 62 or so that I am seeing now. Sometimes the pressure maxes out at 70 at higher rpm.
My question is should I be concerned with this? I would make me feel better if my cruise o.p. was a little more toward the middle of the green arc. Especially as I would like to learn some light aerobatics and have read that higher o.p. is better for that. If indeed this low o.p. is something that should be remedied, could changing the prv spring to the 11713 white spring help? Or can I add more washers to the assembly; I thought I read somewhere that 3 was the maximum though but my friend at the airport with the same engine says I can add more.
Thanks in advance.
My question is should I be concerned with this? I would make me feel better if my cruise o.p. was a little more toward the middle of the green arc. Especially as I would like to learn some light aerobatics and have read that higher o.p. is better for that. If indeed this low o.p. is something that should be remedied, could changing the prv spring to the 11713 white spring help? Or can I add more washers to the assembly; I thought I read somewhere that 3 was the maximum though but my friend at the airport with the same engine says I can add more.
Thanks in advance.