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Cowl bumps with shielded ignition

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  • Cowl bumps with shielded ignition

    Going to bite the bullet and put in slick magnetos on my BC12D. Eisemann are done and itís too hard to get the parts/service.
    Can anybody post some pics with cowl bumps? Particularly the fwd part by the nose cowl. Would like to see how it matches up on the front end.

  • #2
    I used to have fiberglass cowl bumps and a couple of years ago, I made new ones out of aluminum.
    I documented my attempts here: https://vb.taylorcraft.org/forum/tay...-n-96872/page6
    on page 5 and 6.
    There are a few pictures of my installation that might be useful.
    Tim Hicks
    N96872

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    • #3
      Saw the pics. Very helpful. I was especially interested to see how much nose cowl needed to get trimmed on left side. Doesnít look too bad at all. Any experience/knowledge on the bumps Wag-Aero is selling?

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      • #4
        Interested in making a couple more for a couple $$$...?

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        • #5
          It has been posted if you use the BY plugs you do not need cowl bumps. These plugs are about 1/2 inch shorter.
          Ray

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          • #6
            Originally posted by Ray36048 View Post
            It has been posted if you use the BY plugs you do not need cowl bumps. These plugs are about 1/2 inch shorter.
            While the BY plugs are shorter, they are not short enough to get away from the cowl bumps.

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            • #7
              Depends a lot on the plane and cowl. Taylorcrafts are not exactly all alike. Taylor wasn't building F-22s. Tolerances weren't that tight.

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              • #8
                Iíve pretty much gotten used to the idea of cowl bumps. Not that big of a deal.
                Now I just need to see if I can repair an old Eisemann mag. Got one good one bad. Any suggestions for parts or service?

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                • #9
                  I'm going to try to attach a photo of the port side cowl bump on the engine side. notice that the opening cuts through the edge of the top cowl. That's why I added the little "bridge" for strength.Click image for larger version

Name:	cowl bump inside 9_19.jpg
Views:	14
Size:	115.8 KB
ID:	184131
                  Tim Hicks
                  N96872

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                  • #10
                    Very cool. Thanks!

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                    • #11
                      Another GREAT example of how Taylorcrafts were ALL just a little different from each other! I have about half that much cut out in my LH side of the nose bowl on the 41.

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                      • #12
                        Pat, if you need me to make a pair of aluminum cowl bumps using the tools that I used to make mine, I can do that for you. But I don't really want to get into production of these cowl bumps, nor to compete with Wag-Aero or ACS. If you've investigated what is commercially available and you're convinced that the ones that I can make are the right solution for your airplane, let me know.
                        Also note that I have the shorter (Tempest -BY) sparkplugs on the tops of my cylinders.
                        Tim Hicks
                        N96872

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                        • #13
                          Univair earcoupe bumps, installed them on several aircraft.
                          N29787
                          '41 BC12-65

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                          • #14
                            Thanks Tim, I appreciate the offer!! I think Iím good. Found a few options out there that should work fine. If I get jammed up Iíll let you know.

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                            • #15
                              Saw the erocoupe bumps as well. Thanks

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