What is the idle oil pressure of a '91 mazda miata?
It can vary from car to car, but my '91 idles just under 30 PSI. The temperature of the motor also changes it, of course. The cooler the motor, the higher the oil pressure. If you run the car on the freeway for a few hours, the pressure will be slightly lower than normal. Anything in the ballpark should be just fine.
30 at idle 40 at speed
My 91 has been rebuilt therefore it has tighter clearances. I Idle at 35psi and increase linearly by 10 psi per 1000 RPM. For example 5000 RPM approx. 55psi.
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