Re: Regulating oil pressure.

Posted by Owen_Dyneto On 2016/10/14 22:33:07

Just for comparative purposes:

Though there are some differences, my 1934 Eight engine is essentially the same as the '39 Super. I don't use the car in the winter so I use straight SAE 30 detergent oil. I have set the pressure relief valve to open at 55 psi which I always reach even at idle with a cold engine. Oil pressure at road speeds of 40 mph or so is usually 45-50 psi, dropping down a bit at higher speeds or extremely hot weather. Hot idle pressure is usually about 25-30 psi.

EDIT: From the 1934 Eight owner's manual: The gauge will usually show in the neighborhood of 25 to 55 lbs. pressure at normal driving speeds with a pressure of 2 lbs. or more when the motor is idling and the oil is warm.