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  • Oil pressure all over the place

    Just recently I noticed my oil pressure drifting all over the place (from just under 50 psi to almost 100 psi).

    As an engineer I know never to change more than one factor at a time, but here are the two differences.

    1.) Latest batch of oil: I spun a quick batch of oil recently that i was not all that happy with. For starters, it had tond of hydrogenated in it. I pushed it through rather quickly without any prefiltering and not much settle time.

    2.) Drive time: I drove a lot longer than usual. My typical commute is about 15-20 minutes. Today, however I did an hour or so drive.

    My pressure started out WAY low. Typical for me has been around 77 psi (plus or minus 2-4 psi). The start of my trip as around 50 psi. Am thinking the abundance of hydrogenated, maybe, but it wasnt all that cold today (around 50 degrees ambient). Toward the end of the trip i was knocking on 100 psi. Not sure if that is dangerous or not. Truck sat for several hours and the trip home was similar, except not as low to start out. Still, nearly 100 psi towards the end of the trip.

    Any thoughts?
    2005 F350 Harley: Heat Induction Hood, ARE Bed Cover, DashHawk, MBRP turbo back, cat delete, SCT: Tunes by Spartan, Exhaust Sound Videos HERE

  • #2
    don't forget hydrogenated traps animal fats,the combo of thicker oil and "high test fat" will make your pressure higher and lower(hydro is thicker oil and animal fats are "slicker" and thinner then what you would normally run.............greasy
    2000 7.3X V3 So much fun,so little time,Support small Oil,burn WVO,Free and greasy down the road I go!!!!!!!!!!completely self sufficient and proud of it. (Wood furnace.....X.......solar pontoon....solarsheat twins this summer.....I don't Know much.......I'm just a hillbilly with too many guns..............

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    • #3
      Would the longer trip make the heated oil in the tank hotter making it expand and come through the lines with more pressure??

      Tanya

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      • #4
        Originally posted by tanya View Post
        Would the longer trip make the heated oil in the tank hotter making it expand and come through the lines with more pressure??

        Tanya
        Well, I was kinda thinking that. I imagine my oil never really gets hot on the short commutes. My big concern is weather 100 psi is dangerous - that pegs my pressure gauge.

        Jason/Clay, care to chime in (Clay, quit playing with your Christmas stacks and get on the forums!! )
        2005 F350 Harley: Heat Induction Hood, ARE Bed Cover, DashHawk, MBRP turbo back, cat delete, SCT: Tunes by Spartan, Exhaust Sound Videos HERE

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        • #5
          Sorry, been a busy 4 days and yes i was playing with my stacks some.
          I would guess your sending usit is malfunctioning. Do you by chance have an ISSPRO sender? Dads Isspro guage did the same thing sorta. His was pegging 100 and then would drop suddenly to 50 or 40 and then peg 100 again. Changed the sender to an autometer and it was fine. I suppose your pressure regulator could be the culprit too but i'm not aware of them acting like that, maybe Jason could shed some light on that.
          Last edited by Clay; 12-29-2008, 07:15 AM.

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          • #6
            Anothere thought i just had, if you have solidified PH oil in your tank up there in cold OH and your pump is drawing a vacuume when it first switches on before the oil in the tank is melted, that would cause a for low pressure reading...but once the oil was melted, pressure should not exceed the 77 psi you said was typical. Do you have proper heat flow in both coolant lines? Are both lines of equal temp at the module? The return line would feel cooler to the touch if your heat flow was inadiquate like mine was before i added the coolant pump.

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            • #7
              Originally posted by CHenry View Post
              Anothere thought i just had, if you have solidified PH oil in your tank up there in cold OH and your pump is drawing a vacuume when it first switches on before the oil in the tank is melted, that would cause a for low pressure reading...but once the oil was melted, pressure should not exceed the 77 psi you said was typical. Do you have proper heat flow in both coolant lines? Are both lines of equal temp at the module? The return line would feel cooler to the touch if your heat flow was inadiquate like mine was before i added the coolant pump.
              Thanks Clay. I suspect you are right about the improper coolant flow. I think I am right on the edge. My return is much cooler than the supply. I have been kinda sitting the fence waiting for you to get the wrinkles hammered out with the aux pump.
              2005 F350 Harley: Heat Induction Hood, ARE Bed Cover, DashHawk, MBRP turbo back, cat delete, SCT: Tunes by Spartan, Exhaust Sound Videos HERE

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              • #8
                By the way, not to hijack my own thread, but lets see some video of those stacks in action Clay!
                2005 F350 Harley: Heat Induction Hood, ARE Bed Cover, DashHawk, MBRP turbo back, cat delete, SCT: Tunes by Spartan, Exhaust Sound Videos HERE

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                • #9
                  Originally posted by FastCote View Post
                  Thanks Clay. I suspect you are right about the improper coolant flow. I think I am right on the edge. My return is much cooler than the supply. I have been kinda sitting the fence waiting for you to get the wrinkles hammered out with the aux pump.
                  My coolant pump is working flawlessly now, just needed a different pump that didn't leak.

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                  • #10
                    Originally posted by FastCote View Post
                    By the way, not to hijack my own thread, but lets see some video of those stacks in action Clay!
                    i have a little more fuel in my vegi tank to use up so i can removethe tank before i install them.
                    I am going to get a smaller 60 gal. tank to make more room for them. Also i have to decide how i want them hooked up. I was going to fab up a bed kit myself and then started thinking about putting a "y" under the truck off of the maine pipe and using flex pipe to go to each side under the bed, cut 2 holes and all you would see is the stacks comming through the bed. So i have to decide which i can do myself easiest and which would be better.

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                    • #11
                      Originally posted by CHenry View Post
                      i have a little more fuel in my vegi tank to use up so i can removethe tank before i install them.
                      I am going to get a smaller 60 gal. tank to make more room for them. Also i have to decide how i want them hooked up. I was going to fab up a bed kit myself and then started thinking about putting a "y" under the truck off of the maine pipe and using flex pipe to go to each side under the bed, cut 2 holes and all you would see is the stacks comming through the bed. So i have to decide which i can do myself easiest and which would be better.

                      Won't flex pipe produce a nasty whistle?
                      2005 F350 Harley: Heat Induction Hood, ARE Bed Cover, DashHawk, MBRP turbo back, cat delete, SCT: Tunes by Spartan, Exhaust Sound Videos HERE

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                      • #12
                        Originally posted by FastCote View Post
                        Won't flex pipe produce a nasty whistle?
                        i don't know, never thought about it.
                        Never heard that though.

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