View Full Version : Oil pressure question

07-25-2006, 03:17 PM
My oil gauge reads a little over 50 psi. I have a spin on filter on it, and I was just wanting to know what is normal oil pressure, and if that is low what could be wrong? thanks guys

07-25-2006, 03:23 PM
If that is 50 psi at temperature, you are fine. If it is 50 psi at start up and it drops from there, you will probably be looking at a rebuild somewhere in the future.

07-25-2006, 03:55 PM
Like Doug says, it depends on oil temperature. Viscosity also plays a part in oil pressure. What weight oil are you using??

07-25-2006, 04:40 PM
When does it read 50psi, idle, at speed, fully warm. What model car ?
As stated oil pressure is a constanly adjusting measurement that is affected by oil viscosity, engine temp & engine speed.

A simple baseline for minimums would be 15lbs at hot idle & 40lbs @ 3,000 rpms (hot). No reason to panic with numbers under this because more than enough oil get to critical parts even with these readings. It just means a rebuild is in your future. The rocker arms & shaft are the parts that would suffer the most because chances are that most of the oil is being dumped back into the oil pan before it makes it up to the top.

Depending on the motor the most likely places that cause this are the main (crank) bearings & cam bores. Increasing oil viscosity may reflect a higher oil pressure reading but may not necessarily pump more oil to the rockers. In either case 20-50w oil should be used for summer driving.

07-25-2006, 04:59 PM
It is a 1959 tr3a and it stays at 50 psi while warm so I guess it is ok.

07-25-2006, 06:10 PM
50 psi while warm is excelent, no worries at all.

07-25-2006, 08:16 PM
thanks guys

Andrew Mace
07-26-2006, 09:20 AM
Agreed that 50 psi warm running is fine. The only other question is how quickly oil pressure begins to register on "cold" startup? If it takes more than a couple of seconds and you hear any of the dreaded "death rattle," that's another sign you might be looking at a bottom-end rebuild maybe sooner rather than later. Especially with a spin-on filter conversion, oil pressure should begin to register on the gauge almost instantly.

07-26-2006, 10:47 AM
It does I just wasn't sure what the normal operating psi was