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  • Oil question

    Now I use SAE50 oil, but the oil pressure will be low when it is hot. Can I use SAE60 or 70 oil?

  • #2
    Cold
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    Last edited by Freeman; 10-27-2022, 07:29 AM.

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    • #3
      Three minutes.
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      • #4
        Ten minutes.
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        • #5
          Pressure means resistance, Freeman...

          As the motor warms, there is less resistance, thus more flow.

          Little pressure is required, but flow is vital.

          Thicker oil adds resistance, but useful for hot weather or severe duty.

          ....Cotten
          AMCA #776
          Dumpster Diver's Motto: Seek,... and Ye Shall Find!

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          • #6
            Originally posted by T. Cotten View Post
            Pressure means resistance, Freeman...

            As the motor warms, there is less resistance, thus more flow.

            Little pressure is required, but flow is vital.

            Thicker oil adds resistance, but useful for hot weather or severe duty.

            ....Cotten
            Hello, cotten. Now the problem is that the engine heat decay is very serious, the engine noise is very loud, after the heat. This engine is now running at 600 miles.

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            • #7
              Can you observe oil returning to the tank, Freeman?

              If there is flow, then there is a different cause for over-heating.

              ....Cotten
              AMCA #776
              Dumpster Diver's Motto: Seek,... and Ye Shall Find!

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              • #8
                Originally posted by T. Cotten View Post
                Can you observe oil returning to the tank, Freeman?

                If there is flow, then there is a different cause for over-heating.

                ....Cotten
                Yes, I can see it.Flowing

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                • #9
                  I run 60w in my 69 flh, but it never goes below 30psi hot.

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                  • #10
                    Since oil is flowing, Freeman,..

                    We should seek other likely causes for over-heating and noise; Is one cylinder noticeably hotter than the other? (Infra-red thermometers are fun.)

                    Valve train noise can occur with moderate heat. Please tell us if it has solid or hydraulic tappets?

                    I now see your gauge is installed in the overhead oiler screen gallery, instead of upon the pump itself. But even upon the pump, it only tells you when the motor is warm.

                    ....Cotten
                    AMCA #776
                    Dumpster Diver's Motto: Seek,... and Ye Shall Find!

                    Comment


                    • #11
                      Originally posted by T. Cotten View Post
                      Since oil is flowing, Freeman,..

                      We should seek other likely causes for over-heating and noise; Is one cylinder noticeably hotter than the other? (Infra-red thermometers are fun.)

                      Valve train noise can occur with moderate heat. Please tell us if it has solid or hydraulic tappets?

                      I now see your gauge is installed in the overhead oiler screen gallery, instead of upon the pump itself. But even upon the pump, it only tells you when the motor is warm.

                      ....Cotten
                      solid tappets
                      Looks like I need to measure the temperature.
                      What is a reasonable temperature range?

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                      • #12
                        I run 60W in my 65 FLH and when hot at idle, very low pressure. I have good flow so I don't worry about the low pressure at idle.
                        Craig (Delaware)
                        Delaware Bay Chapter
                        Perkiomen Chapter
                        AMCA Member #1011

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                        • #13
                          Originally posted by Freeman View Post
                          solid tappets
                          Looks like I need to measure the temperature.
                          What is a reasonable temperature range?
                          Beware of solid tappet replacement kits with aluminum pushrods, Freeman,...

                          Their thermal expansion is less than the cylinder, and will make noise if adjusted normally; They require to be as tight as possible without losing compression.

                          A quick search of "Harley-Davidson engine temperature chart" produces volumes of data. But even without a baseline, we can compare the motor to itself.

                          If one cylinder becomes hotter than the other quickly, it is certainly a clue.

                          ....Cotten
                          PS: I took my pyrometer to the Davenport Meet to make comparisons, but everybody was riding golf carts.

                          Last edited by T. Cotten; 10-28-2022, 08:52 AM.
                          AMCA #776
                          Dumpster Diver's Motto: Seek,... and Ye Shall Find!

                          Comment


                          • #14
                            Originally posted by craig (DE) View Post
                            I run 60W in my 65 FLH and when hot at idle, very low pressure. I have good flow so I don't worry about the low pressure at idle.
                            My data needs to be checked again, thank you.

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                            • #15
                              Originally posted by T. Cotten View Post

                              Beware of solid tappet replacement kits with aluminum pushrods, Freeman,...

                              Their thermal expansion is less than the cylinder, and will make noise if adjusted normally; They require to be as tight as possible without losing compression.

                              A quick search of "Harley-Davidson engine temperature chart" produces volumes of data. But even without a baseline, we can compare the motor to itself.

                              If one cylinder becomes hotter than the other quickly, it is certainly a clue.

                              ....Cotten
                              PS: I took my pyrometer to the Davenport Meet to make comparisons, but everybody was riding golf carts.
                              I see. I need a further examination. Thank you very much.

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