- Joined
- Nov 3, 2003
- Messages
- 48,486
Agree that it's nothing to worry about. In fact, it's something to be quite happy about I would say.
While mine would start at 70 and stay there for awhile, it would run at 40-45 psi all day long when hot. Only very rarely in the years I drove it daily did it go below that.
There is probably a over-pressure relief/bypass valve built in to the pump that likely opens up at 80-90 psi. At least I think that's how the Ford pumps work. Someone correct me if that's wrong.
The '66 Vette 327 I rebuilt the engine on ran at 95 psi when cold and 75 when hot (stock mechanical gauge) and, while it kind of surprised me, I wasn't too concerned.
And no harm ever came of it.
I don't remember the pressure at which you worry about mushrooming an oil filter, but it's probably in the 150-300 psi range. Only seen that happen a couple of times over the years, and never with a Bronco.
Remember, none of the seals (at least that I can think of) are under pressure. It's only bearings, rockers and a few other hard parts. Seals are all in splash areas, rather than pressure areas, so not likely to blow out or leak due to high oil pressure.
The only scenario I can think of where that might be an issue is when you apply some old racers tricks and drill small holes in the oil gallery plugs to get oil sprayed directly on to certain things like timing chains and gears, or distributor gears. Where the oil spray might get closer to a main seal or other gasket.
I suppose it might indicate some of the internal tolerances as being too tight and out of spec. But I'm not sure that's at issue here either.
Someone with more internal engine dynamic knowledge will have to fill in those blanks.
Paul
While mine would start at 70 and stay there for awhile, it would run at 40-45 psi all day long when hot. Only very rarely in the years I drove it daily did it go below that.
There is probably a over-pressure relief/bypass valve built in to the pump that likely opens up at 80-90 psi. At least I think that's how the Ford pumps work. Someone correct me if that's wrong.
The '66 Vette 327 I rebuilt the engine on ran at 95 psi when cold and 75 when hot (stock mechanical gauge) and, while it kind of surprised me, I wasn't too concerned.
And no harm ever came of it.
I don't remember the pressure at which you worry about mushrooming an oil filter, but it's probably in the 150-300 psi range. Only seen that happen a couple of times over the years, and never with a Bronco.
Remember, none of the seals (at least that I can think of) are under pressure. It's only bearings, rockers and a few other hard parts. Seals are all in splash areas, rather than pressure areas, so not likely to blow out or leak due to high oil pressure.
The only scenario I can think of where that might be an issue is when you apply some old racers tricks and drill small holes in the oil gallery plugs to get oil sprayed directly on to certain things like timing chains and gears, or distributor gears. Where the oil spray might get closer to a main seal or other gasket.
I suppose it might indicate some of the internal tolerances as being too tight and out of spec. But I'm not sure that's at issue here either.
Someone with more internal engine dynamic knowledge will have to fill in those blanks.
Paul
