I just finished adding a Mechanical oil pressure Gauge.Instead of using the plastic oil line I chose to use the stainless steel hose.WOW it was over half the price of the gauge itself. But I feel better with less of a chance of a leak.Then I started the car the gauge went to about 62-63 pounds of pressure. I reved it up it about 1800 RPM and it jumped to over 80.I then cut it off.Are those number normal.I had the motor rebuilt and have about 700 miles on it. I used a breakin oil for the first 500 miles and changed out to a non synthetic oil for the next 1000 miles then at that time am going with synthetic.

 

Pressure seems a little high for a stock oil pump but it will lower by as much as half when oil gets hot.

 

Is the pump relief valve shimmed?
That sounds OK to me. My 403 has great high pressure and it likes it fine.

 

I have a Mondello high volume oil pump. Would that make a difference.

 

That oil pressure is normal for a fresh engine and as stated above will drop off some is the oil gets hot and viscosity thins a bit.

 

What viscosity oil are you using?.


Roger.

 

Hardware store sells copper line that fits. Thats what I use.

 

 

try opening the oil line at the gauge put down a rag and open the oil pressure gauge to bled out air once it leaks out tightin it back up while the motor is running.

 

I advise against that, the air in the line acts as a damper, stopping shock loads on the gauge. The gauge will read true with air in it, it's not like a brake line.


Roger.

 

X2 do not try to bleed the line. The gauge will give accurate reading with air in the line. The line is pressurized and it reads the pressure and not the amount of oil going through it.

 

Bleeding the line is an exercise in futility, it will always drain back a little and have air pockets. The air will not hurt the readings.

 

I use the Mondello oil pump also and my oil pressure is around 90 when it's cold but drops considerably when it warm up been that way for at least 8 years.
railguy

 

Mine is about the the same. 70/75 cold 45/50 at idle and 60 when running down the track.

Gene

 

40psi with a hot engine above idle speed and 20psi idling is fine for street use. Maybe a bit more if you are caning the car down a strip or racetrack but there is no realistic need for more than 60psi IMO.
Don't forget the oil pump uses power from the engine, the more pressure the greater the load, which is imposed on everything that drives the pump, distributor gear, drive shaft, timing chain etc. It's not a huge amount I know, but don't overkill it.


Roger.

 

I agree. I even heard that the extra pressure would create more friction causing heat.I know it sounds funny but the amount of heat that it makes probably isn't worth mentioning. But to lower the oil pressure on my car would require taking the oil pan off that would mean at least partially removing the engine.
railguy