oil pressure
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Senior User
Joined: Sep 1999
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oil pressure
I rebuilt my 390 last year. When I first start the truck, I have about 40-50 psi oil pressure. If I get on the highway and run between 65-80 mph, I get about 40 psi. but right after I get off the highway my oil pressure drops to between 5-20 psi. Is this normal, or should I change the pump right away? I'm going to be making a 850 mile trip, in this truck, in about 6 weeks, should I worry?
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Senior User
Joined: Sep 1999
Posts: 103
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oil pressure
started with a 360 block, bored it .030 over, new cam bearings, used a 390 crank previously ground .010 under- had it polished, dusted, measured. new main bearings, had mains line honed. had rods reconditioned. Used sealed power engine kit, including sealed power oil pump. plastiguaged all mains and torqued everything correctly. anything else you'd like to know?
Posting Guru
Joined: Oct 1999
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From: yes
oil pressure
I have a high volume pump on my 360 and when I start it on a really cold day I can hit 80+PSI but when the engine warms up it's around 50 and idles down to 10-15 at stop lights and really low idle speed
Junior User
Joined: May 2000
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From: Louisiana
oil pressure
oil pressure also depends on where you are taking your pressure readings from.if you are taking it from a fitting at the pump I would think the readings would be a little higher.but if the readings are coming from a sending unit say on the top of the intake..that is the farthest from the pump and WILL be a little low.
49 F-1 (soon to be 460 powered streetrod)
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83 F-150
94 Explorer
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If you listen on a quiet night..you can hear a Chevy rust...F-1s FOREVER
49 F-1 (soon to be 460 powered streetrod)
50 F-1
83 F-150
94 Explorer
95 Mustang
If you listen on a quiet night..you can hear a Chevy rust...F-1s FOREVER
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Senior User
Joined: Mar 2000
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oil pressure
i have a high volume oil pump in my 352. at startup when the motor is cld i hve 80+ psi. when warm it drops down to 60 psi. that is the lowest it ever goes. BTW my motor has well over 25,000 on the rebuild.
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New User
Joined: Feb 2000
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oil pressure
I have a 69 f-100 with the original 360 unrebuilt. My oil pressure runs about 50 psi cold then drops to 40 on highways and 18 on idle. By the sounds of the other posts that seems to be about the norm for the FE engines so I wouldn't think you have anythig to worry about.
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Joined: May 2000
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oil pressure
I have a 79 400 with less than 10000 miles on the rebuild, I installed an autometer gage about six months ago and my readings are almost identical as yours. I was originally worried to but was told it is normal. my readings are consistant with the temperature of the engine. I wouldn`t worry until they start changing other than that.
New User
Joined: May 2000
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oil pressure
I have a 79 400 with less than 10000 miles on the rebuild, I installed an autometer gage about six months ago and my readings are almost identical as yours. I was originally worried to but was told it is normal. my readings are consistant with the temperature of the engine. I wouldn`t worry until they start changing other than that.
Senior User
Joined: Jan 2000
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oil pressure
My 390 does the same thing, and what I am guessing is that when your working it hard for a while all the oil gets hot and when you slow down it doesnt cool as fast as the water does. I have been thinking of getting an oil cooler, I dont know if thats it but its an idea, an oil cooler couldnt hurt anyway, since I do a lot of towing.
Dave
http://www.davesmonsterpit.com
Dave
http://www.davesmonsterpit.com
Freshman User
Joined: Apr 2000
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oil pressure
I have a 1976 360 w/ 123,000 no re-build and my oil pressure starts a cold about 40psi, warm/hot at highway speeds 20-30 psi and hot at idle 2-7 psi!
Are you All saying this is some what normal???
Brian
1976 F-350 Super Camper Special
1993 EB Bronco
Are you All saying this is some what normal???
Brian
1976 F-350 Super Camper Special
1993 EB Bronco
Junior User
Joined: Aug 1999
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oil pressure
remove the oil filter housing from the block, match the gasket to the openings in the housing, and replace the housing. try another sending unit just to be sure the existing one is reading correctly. these measures will help you get a more acurate reading at the sending unit!