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Exhaust Conversion Cowl Bumps

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  • Exhaust Conversion Cowl Bumps

    Any suggestions for sources or fabrication methods for the cowl bumps required to convert F19 exhaust to the Cessna 150 system?

  • #2
    Re: Exhaust Conversion Cowl Bumps

    Originally posted by N3787T View Post
    Any suggestions for sources or fabrication methods for the cowl bumps required to convert F19 exhaust to the Cessna 150 system?
    I'd contact Charly Center at: http://www.crosswindsstol.com He's a good man I've known for years and has done a few Taylorcrafts like the one below.

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

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    • #3
      Re: Exhaust Conversion Cowl Bumps

      Thanks, Gary... Charly's got 'em!

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      • #4
        Re: Exhaust Conversion Cowl Bumps

        Originally posted by N3787T View Post
        Thanks, Gary... Charly's got 'em!
        Good find! Say hello to him from Gary Pearse in Fairbanks, and tell him I finally got another Taylorcraft after all these years.

        Edit: I've got the C-150 system but no cowl bumps. Atlee Dodge modified the headers slightly to bring them in closer to the engine and clear the cowl.

        Gary
        Last edited by PA1195; 09-03-2015, 16:17.
        N36007 1941 BF12-65 STC'd as BC12D-4-85

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        • #5
          Re: Exhaust Conversion Cowl Bumps

          I like the idea of not modifying the cowling... I'll have to look into that. I'm running a SportCub-type system now, and it runs great, but haven't been able to get enough heat to the carb and cabin.

          I'll pass on your hello to Charly.

          Doug

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          • #6
            Re: Exhaust Conversion Cowl Bumps

            Originally posted by N3787T View Post
            I like the idea of not modifying the cowling... I'll have to look into that. I'm running a SportCub-type system now, and it runs great, but haven't been able to get enough heat to the carb and cabin.

            I'll pass on your hello to Charly.

            Doug
            One experimental change that works is to install a properly sized coiled door spring over the exhaust inside the heat shroud(s). First anneal the tempered spring with a torch, then wrap it around the pipe. Secure the soft spread coils to the pipe with safety wire here and there.

            Make sure the coils can't contact and wear the external shroud. They're soft enough to not wear the underlying stainless pipe if properly secured. It acts like the flow interrupters Cessna and others fastened to the core of some mufflers to extract more heat.

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

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