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  • Engine: Oil Filter Orifice

    I was wondering if anyone knows the actual size of the orfice that was originally used to restrict the oil flow to the Fram F4 oil filter. I know that the size mentioned most often when this subject comes up is that it should not be larger than. 045". A friend recently measured the orfice of a restrictor on his F4 and it measured about 0.030". Just wondering how these sizes compare to the original size used by Studebaker.

    Roger List
    Roger W. List
    Proud Studebaker Owner

  • #2
    I'm probably the last person you should trust about this (so wait for more answers), but the .030 measurement was the first thing that popped into my mind as familiar.
    John Clary
    Greer, SC

    SDC member since 1975

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    • #3
      A number 56 (.0465") drill bit is the biggest one that will fit in the one I have. However, Fram used both straight and L-shaped fittings in different filter kits, and they may not have all had the same orifice.
      Skip Lackie

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      • #4
        The fitting that measured 0.030 " is a straight fitting.

        Roger List
        Roger W. List
        Proud Studebaker Owner

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        • #5
          The oil filter restrictor is .046", part #1549669. The .030" restrictor part # 530918 is for the fuel pump arm lubrication on the early style filler-mounted pump.

          Click image for larger version

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          "Burning Bridges...Lost Forevermore"......

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          • #6
            When I installed a remote oil filter system on my Sky Hawk, I used a .045 carburetor jet drill bit. Seems to work just fine...

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            • #7
              Since hot oil has a viscosity nearly like water at room temperature, I hooked the garden hose and a pressure gauge to an orifice and measured how much water came out. At 40 psi through an 0.045" orifice, there is about 1 quart a minute flow. The flow will vary with the square of the diameter, so an 0.060" orifice will have 75-80% more flow, an 0.030" orifice will have about 45% of the 0.045" one.
              Click image for larger version

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              Attached Files
              Gary Ash
              Dartmouth, Mass.

              '32 Indy car replica (in progress)
              ’41 Commander Land Cruiser
              '48 M5
              '65 Wagonaire Commander
              '63 Wagonaire Standard
              web site at http://www.studegarage.com

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              • #8
                Gary's Chart pretty much shuts up all those that say a Bi-Pass, partial flow Filter does NOTHING, and you would have to drive for Miles and Miles to Filter all the oil.
                StudeRich
                Second Generation Stude Driver,
                Proud '54 Starliner Owner

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                • #9
                  Originally posted by StudeRich View Post
                  Gary's Chart pretty much shuts up all those that say a Bi-Pass, partial flow Filter does NOTHING, and you would have to drive for Miles and Miles to Filter all the oil.
                  Yep, and I would rather have a partial flow than no filter at all. Somewhere a long time ago I remember reading that a partial flow does better on smallest particles due to a slower flow through the filter medium.

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                  • #10
                    Thanks Gary, that is quite an enlightening chart. Curious though why you seem to have two curves for a 0.060 orfice.

                    On another note, anyone know what part no. 187802 is? The description of this in the M series parts book is: ELBOW, oil filter inlet pipe (cyl. end.) All the other fittings for connecting to the oil filter use part numbers from the standard parts section of the manual. This elbow is used on both the Champion and Commander engines. I'm assuming that since all the other fittings are from the standard parts listing that this particular elbow must contain the restrictor for the input to the filter. If someone would have one of these to verify that, it would lay to rest this issue once and for all.

                    Roger List
                    Roger W. List
                    Proud Studebaker Owner

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                    • #11
                      Just checked the 2R parts manual. That part number is also used on 2R, 3R and E series trucks with the factory installed filter. On some it is prefixed with a G.

                      Roger List
                      Roger W. List
                      Proud Studebaker Owner

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                      • #12
                        Originally posted by Roger L. View Post
                        /Cut/On another note, anyone know what part no. 187802 is? The description of this in the M series parts book is: ELBOW, oil filter inlet pipe (Cyl. end.) All the other fittings for connecting to the oil filter use part numbers from the standard parts section of the manual.Roger List
                        Quote: Dwain's Post #5:

                        "The oil filter restrictor is .046", part #1549669. The .030" restrictor part # 530918 is for the fuel pump arm lubrication on the early style filler-mounted pump."

                        This tells me that indeed the Engineered hardware had a drawing Number and that is why it has a Part Number, so you are right it likely was a restrictor Fitting, but earlier than the 1549669, and EVEN the 530918 and we don't know it's size YET.
                        StudeRich
                        Second Generation Stude Driver,
                        Proud '54 Starliner Owner

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                        • #13
                          Originally posted by Roger L. View Post
                          Thanks Gary, that is quite an enlightening chart. Curious though why you seem to have two curves for a 0.060 orfice.

                          On another note, anyone know what part no. 187802 is? The description of this in the M series parts book is: ELBOW, oil filter inlet pipe (cyl. end.) All the other fittings for connecting to the oil filter use part numbers from the standard parts section of the manual. This elbow is used on both the Champion and Commander engines. I'm assuming that since all the other fittings are from the standard parts listing that this particular elbow must contain the restrictor for the input to the filter. If someone would have one of these to verify that, it would lay to rest this issue once and for all.

                          Roger List
                          Not that Gary, but I think, from what I see on my small screen, that there are curves for 0.060 and 0.050, not two 0.060.
                          Gary L.
                          Wappinger, NY

                          SDC member since 1968
                          Studebaker enthusiast much longer

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                          • #14
                            Hopefully problem solved! Went through all the Studebaker engines I have lying around and found a champion engine that may have had a factory installed oil filter. It had the orfice fitting in it that may be part no. 187802. When I measured the orfice it was a perfect fit for a #52 drill bit, that would be 0.0635". I also have another Commander truck engine that may have a fitting but it's lying on it's right side so I've got to move it to check.

                            Roger List
                            Roger W. List
                            Proud Studebaker Owner

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                            • #15
                              The oil restrictor on my unmolested (99% stock-original), 1960, 259 powered Lark 2dr. wagon, measured .030".

                              Mike

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