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Is there any reason to keep my primer?

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  • Is there any reason to keep my primer?

    It seems like the primer on the O-200 injects fuel at the same point as the accelerator pump...

    Made me think, why not just remove the primer and use the accelerator pump?

    I can't see an increased risk of induction fire... any thoughts?

    Thanks

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  • #2
    I agree it will work with the accelerator pump, however the primer nozzle gives a finely atomized spray that will not run out the airbox. The accelerator pump puts mostly liquid in that runs to the bottom of the airbox.Your preference.

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    • #3
      If you have an electric starter it might be okay, but if not keep the primer. I have seen times when the accelerator pump was not enough to get the engine started.

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      • #4
        Is there any reason why you should wish NOT to keep it? Is keeping the primer doing the engine any harm? Is the extra weight of it concerning you? Is it a certified requirement?

        Many questions of which enquiring minds need to know the answers!

        Rob

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        • #5
          I'd keep the primer but move the nozzles to the cylinders.
          John
          I'm so far behind, I think I'm ahead

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          • #6
            Not necessary if there is electric start (think: F19 with electric start, or C150 so equipped). OP has not said what aircraft/engine combination.

            /wait

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            • #7
              Originally posted by Robert Lees View Post
              Not necessary if there is electric start (think: F19 with electric start, or C150 so equipped). OP has not said what aircraft/engine combination.

              /wait
              That is correct. His picture is not even showing a Taylorcraft, it shows something with spring gear and a nose wheel.

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              • #8
                Originally posted by Robert Lees View Post
                Is there any reason why you should wish NOT to keep it?
                Extra stuff that doesn't do anything is always bad. Biggest liability is the chance of a fuel leak between gascolator and pump.



                Originally posted by Robert Lees View Post
                Is keeping the primer doing the engine any harm?
                Not currently, but they often start slowly leaking, causing a rich mixture.


                Originally posted by Robert Lees View Post
                Is the extra weight of it concerning you?
                No, but it's always nice to get rid of extra stuff.


                Originally posted by Robert Lees View Post
                Is it a certified requirement?
                It's a part that came with a certified aircraft.



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                • #9
                  Originally posted by N96337 View Post
                  I'd keep the primer but move the nozzles to the cylinders.
                  John
                  That is what I would prefer, but I don't think my cylinders have the pipe threaded hole to accept the primer nozzles.

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                  • #10
                    Originally posted by 3Dreaming View Post

                    That is correct. His picture is not even showing a Taylorcraft, it shows something with spring gear and a nose wheel.
                    Picture was just a good one I pulled off the internet of the same setup. Aircraft is a F19.

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                    • #11
                      I'd be surprised if there are no primer holes in the cylinders. Not all have them but parts manuals list them for C-85 and up. I commented on Supercub about a 4-point system and why, plus the manifold pressure gauge driven by the singe port in the spider. They do make for an easier start when cold and can keep the engine running when the carb has problems if needed.

                      Gary
                      N36007 1941 BF12-65 STC'd as BC12D-4-85

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                      • #12
                        You can always move it to a jug if you have the ports for it I did it to the back 2 cylinders, makes for easy hand propping. Do you know what your jugs have actually or are you guessing? Primers work and really help in cool temperatures. Tim
                        Last edited by astjp2; 02-10-2020, 15:42.
                        N29787
                        '41 BC12-65

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                        • #13
                          Confirmed that my cylinders don't have the holes for cylinder-prime.




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