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Old Jul 22, 2003 | 05:17 PM
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samram
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From: Burbank USA
Question Oil Pressure??

Any body know the approx oil pressure reading for a 390.Not sure what it is, the engine was just "professonally"rebuilt?
 
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Old Jul 22, 2003 | 05:20 PM
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From: Burnsville, MN
Oil Pressure??

It will depend on a couple of things:
1). The relief valve in the oil pump - this determines your max. pressure.

2). The volume of oil the pump can pump.
3). The clearance of the bearings.
4). The viscosity of the oil
5). The temperature of the oil.

These determine the minimum pressure, it can be quite low, but on a new motor I'd be surprised if it was less than 30.

At least that was my experience when I last overhauled an FE motor 25 years ago.
 
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Old Jul 22, 2003 | 09:06 PM
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Oil Pressure??

Mine with about 2000 miles has about 70lbs cold with 10w40 at idle.
50lbs at idle hot and 60lbs at cruise speed hot. This is with a High Volume Oil pump, but no other oiling mods.
Brian
 
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Old Jul 22, 2003 | 10:28 PM
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Oil Pressure??

Mines got 70psi hot at speed after a quickie overhaul with 20W-50. Just went with new rods and mains, left the crank std/std. Oil pump is a high pressure unit/std volume
 
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Old Jul 25, 2003 | 10:05 AM
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samram
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Oil Pressure??

Thanks for the info
 
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