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Hello all and I apologize if this issue I am having has been answered before. I can’t find my particular issue discussed on google :( Oil is full and is Motorcraft 5w-20 with a Motorcraft oil filter. Wiring to the autometer gauge is

I have a 97 GT and hooked up a autometer oil pressure gauge to know where I am at. The motor is a 4.6 2v and has PI heads, blower cams and was rebuilt 2k miles ago. Oil pressure is 70-80psi on cold start and I never lose it or see it drastically change. When nice and hot, I am idling with 20-25 psi. Once i bump the throttle it shoots to 50 psi. When I accelerate hard from a stop I see a nice gradual climb with pressure all the way to 60-70 psi. When I am driving on the highway is when I notice a slight fluctuation. When I am going 70-75mph in 5th gear at about 2200 rpm I noticed the meter was at 50 psi. I give it throttle and the needle will drop slightly down to about 45 psi and once I let off the throttle it will jump back to 50 psi. When I am at the same speeds and drop it into 3rd and accelerate the pressure goes to 55 and doesn’t climb as quick as it does when I am messing around in town. This is my first time having a aftermarket oil pressure gauge so I may be just a little paranoid. Just wanted to hear yalls opinions and/or experiences. Am I crazy or what? Thanks in advance!


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Cold pressure seems just a tad high for 5w20, but I’m not concerned. That’s quite healthy so I certainly wouldn’t be worried about a lack of pressure.
 

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None of that looks like an issue to me. Not the same engine but I had a '90 302 with a mechanical gauge and it was the same kind of pressures and behaviors. So I would be inclined to think that's normal.

Only weird thing is the slight drop and climb at highway speed you describe...hence your concerns. If you are in 4th at a steady 2200 rpm and add throttle does it to the same thing?
 

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Discussion Starter #5
None of that looks like an issue to me. Not the same engine but I had a '90 302 with a mechanical gauge and it was the same kind of pressures and behaviors. So I would be inclined to think that's normal.



Only weird thing is the slight drop and climb at highway speed you describe...hence your concerns. If you are in 4th at a steady 2200 rpm and add throttle does it to the same thing?


I need to double check 4th at 2200 rpm to be 100%, but if my memory is correct it does the same thing.


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Discussion Starter #6
Just changed the oil. Im still showing fine metal material in the oil (less than 5k miles on the rebuild). We will see what happens on my ride home from work tonight


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Discussion Starter #7
Motor has a slight tap around cylinders 7-8. Have to drop the motor again :(


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Discussion Starter #9
Ouch sorry to hear that


Ya, no good. I never lost oil pressure, but I don’t know what happened. I hope the machine shop can find and fix this issue. I didn’t think using aftermarket internals would be this difficult to keep running.


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It’s not any more difficult than factory internals. It all depends on assembly and attention to detail.

Question, what oil pump did you use?
 
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