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Original Message
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| Oil pressure specs |
| By John - 05/14/2002 4:50:00 PM; IP 142.177.114.1 |
OK...I'll give you some specs to go by, but first, oil pumps deliver more oil the faster they spin until the bypass valve opens. The pressure is a function of the resistance to this flow by the engine. A very tight engine may achieve maximum oil presure at an idle even with hot oil. That's why in some cars, you never see the gauge change once you start it. But in these FE's, you will see a difference between oil pressure at an idle and the max oil press at high revs. So, here's what my 1966 Ford facotry manual says:
Oil hot @ 2000 rpm:
240 35-60 psi
427 40-55 psi
428 Police Interceptor 45-70 psi
All other 35-55 psi
By "all other", they seem to mean all other engines covered in the manual including the 390, regular 428's, 289's, etc.
Now for my 428 solid lifter engine, here's the specs I've found:
High Volume Pump:
Cold idle 75 psi
Hot idle 22 psi
Cold revs 75 psi
Hot revs 75 psi
2000 rpm hot 55 psi
High Volume/High Pressure Pump
Cold idle 140 psi
Hot idle 22 psi
Cold revs 140 psi
Hot revs 90 psi
2000 rpm hot 55 psi
Note: I don't use the high pressure pump any more!
When my engine started to show reduced oil pressure because of the worn main bearings, I was getting:
Cold idle 60 psi
Hot idle 13 psi
Cold revs 62 psi
Hot revs 62 psi
2000 rpm hot 45 psi
My bearing clearances were originally blueprinted as close as possible to 0.0025". They were down to the copper in places when I stripped the engine down.
Hope this can be of help.
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