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  • Re: 914 Exhaust leak

    by » 10 months ago


    So what would you say is the correct way to apply header wrap in an aircraft application?


  • Re: 914 Exhaust leak

    by » 10 months ago


    For those that don't own a 914, the exhaust system is very different to the 912.

    There are no spring tensioned ball joints. The turbo/muffler unit is hard mounted. So the labyrinth joint, or slipper joint on the 914 plays the role of expansion joint largely. In my observation.

    So l am reluctant to do anything about leak prevention that may provide constriction.

    With regards to heat wrap, l also have reservations about heat wrapping the pipes up stream of the turbo as l fear it just pushes more heat into the turbo. 


  • Re: 914 Exhaust leak

    by » 10 months ago


    The exhaust pipes are so short there isn't time for additional heat and the pipes are stainless. The heat generated is from the burn exhaust as it exits and can't get any hotter as it goes through that short piping. The wrap can move some because the expansion isn't enough to be an issue.


    Roger Lee
    LSRM-A & Rotax Instructor & Rotax IRC
    Tucson, AZ Ryan Airfield (KRYN)
    520-349-7056 Cell


  • Re: 914 Exhaust leak

    by » 10 months ago


    Applying header wrap is quite easy. You can buy it at almost any automotive store. It usually comes in 50' which is plenty for a couple of planes. You dampen it, not soak it. I usually cut about 54" per strip which usually gives me a little extra to cut off when done. If you have really long pipes that may take a little more. It can shred some on the end so just trim it with a pair of scissors. You use clamps to hold it on  and ONLY over wrap the edges by 3/8" because if you over wrap by half or more you will retain too much heat. You do not need to worry about looking for a break in a pipe if that ever happened because the pipe usually crack all the way across and don't just get pin holes. The wrap will shred and you'd know exactly where the break was. Header wrap has been around for several decades. Nothing mysterious about it.

    28627_2_header_wrap_1_175.jpg (You do not have access to download this file.)
    28627_2_header_wrap_2_119.jpg (You do not have access to download this file.)
    28627_2_header_wrap_508.jpg (You do not have access to download this file.)

    Roger Lee
    LSRM-A & Rotax Instructor & Rotax IRC
    Tucson, AZ Ryan Airfield (KRYN)
    520-349-7056 Cell


  • Re: 914 Exhaust leak

    by » 10 months ago


    Thanks Roger! My Zenith 701 is tightly cowled and I have always wondered if wrap could reduce enough heat to create an increased risk of carburetor icing?


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