[Revo4789]

So I have a fresh built 460 bored 30. Forged pistons I beam rods high volume oil pump. Solid lift flat tappet cam. Trick flow heads pretty hot motor. Also running a 10 qt oil pan from a f700. My problem is at idle it is at 70 cold 35 hot and 55 at 2000. But under any hard acceleration my oil pressure will drop to 20 and stay at 20 regardless of rpm. But if u shut it off for a minute and start it back up it comes right back up to where it is supposed to be. Any help would be much appreciated

 

[wickettoby1]

Is the pan baffled or does it have a “sump” to keep the pickup submerged in oil?

 

[dacofa]

You might have something in your heads drain back holes restricting flow. Next time it happens, stop and pull a cover and see how much oil is upstairs.

 

[Revo4789]

Is the pan baffled or does it have a “sump” to keep the pickup submerged in oil?

On those rear some pan it only has one baffled in the center that’s about all I seen on it

 

[Revo4789]

You might have something in your heads drain back holes restricting flow. Next time it happens, stop and pull a cover and see how much oil is upstairs.

OK will do because I know I cleaned and Dremel the oil drain back holes in the block just to make sure

 

[causticuc]

Canton likes to suggest their accusump for this type of issue.

You have a force measurement for your acceleration?

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[dacofa]

Still makes me think somehow the oil pump relief valve is sticking. When you shut it off, it resets itself.

 

[Revo4789]

Still makes me think somehow the oil pump relief valve is sticking. When you shut it off, it resets itself.

I am honestly thinking the same thing to cause I drained oil and refilled with new filter. Vr1 20-50 my pan holds 10 but I keep adding more than that in 1 quart increments all the way up to 15 and it does it in free rev. Once it gets passed 4500 rpm boom that’s when it does it but it will hold at 40 psi now. I shut it down for 15 seconds start it back up and it’s back at 45 idle and 60 when reving. But the second you get in the higher rpms it does the same thing.

 

[Paul69]

So I have a fresh built 460 bored 30. Forged pistons I beam rods high volume oil pump. Solid lift flat tappet cam. Trick flow heads pretty hot motor. Also running a 10 qt oil pan from a f700. My problem is at idle it is at 70 cold 35 hot and 55 at 2000. But under any hard acceleration my oil pressure will drop to 20 and stay at 20 regardless of rpm. But if u shut it off for a minute and start it back up it comes right back up to where it is supposed to be. Any help would be much appreciated

Sounds like oil getting aerated by the crank.

 

[dacofa]

Sounds like oil getting aerated by the crank.

That will happen if over filled. Very possible.

 

[causticuc]

Would need to know what is being used for scraper and tray, no?

Issue is decribed as under hard acceleration not under heavy load...

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[dacofa]

Hard acceleration the oil slams to the rear of the sump. But oil pressure should return to normal when you stop accelerating and it comes back to the oil pickup, if a front sump system. Unless the pickup is not in the proper height location to the pan floor. F700 pan, front or rear sump?
But if you're setting stopped at idle and it still isn't returning to normal, I'd still be looking at the pump/relief valve.

 

[causticuc]

Hard acceleration the oil slams to the rear of the sump. But oil pressure should return to normal when you stop accelerating and it comes back to the oil pickup, if a front sump system. Unless the pickup is not in the proper height location to the pan floor. F700 pan, front or rear sump?
But if you're setting stopped at idle and it still isn't returning to normal, I'd still be looking at the pump/relief valve.

full sump F-600 or F-700 oli pan?

Does any one know if a big truck oil pan was full sump for the 385 like this F-600 oil pan that i used on my FE. thanks .Roni have a big truck pan but its like a mid sump.

www.460ford.com

Says rear.

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[FoMoCo]

Sure sounds like the relief valve to me as well.................

 

[woodstuff]

Have you looked a Canton Accu-Sump?"