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Hi to all,

 I’m thinking of wrapping my exhaust pipes with titanium wrapping tapes (specially made for exhaust pipes) in order to keep the temperatures inside the cowling as low as possible. I fly a TL Sting ultralight , with a turbocharged 914 ROTAX in a quite hot environment (South Europe-Greece). During summer temps can go really high. So, I’m trying to reduce as much as possible the temps inside the cowling and I saw that on cars and in some boats they wrap the exhausts with this special tape. Also I read in some other threads that Roger Lee is doing that to several 912 ‘s for years. What I’m asking is, if such an installation might negatively effect the operation of the turbo unit in any way and if someone has done it already in a 914. 

  • Re: 914 exhaust wrapping

    by » 5 months ago


    You might consider having the pipes sprayed with ceramic coating inside and out.  I've used this in my large round motors.  Cool to the touch minutes after shutdown.

    mb


    Thank you said by: Spiros Economou

  • Re: 914 exhaust wrapping

    by » 5 months ago


    hi Spiros

    You should check with TL  to see if they have ever tested this idea.  The 914 exhaust runs much hotter and the pipes that to to the connector have special slip joints to accommodate the expansion from cold running to hot.  Stress from the excess heat that might get trapped under the wrap may lead to fractures of the stainless pipes going to the collector.  The TL is a tractor so the prop should be giving a good air flow to the cowl vents.  The risk from this type of heat under the cowling is more of an issue in hot soak from long ground runs where you have little to no forward speed.  As for the question of if it would affect the turbo the answer is most likely no.  As long as you always allow the oil to cool down after flying then there is not much that can damage the turbo.  Avoid hot engine shutdowns to preserve the centre section of the turbo being too hot after flights.  

     

    Cheers


    Thank you said by: Spiros Economou

  • Re: 914 exhaust wrapping

    by » 5 months ago


    I asked my Rotax guru about wrapping the pipes on my 914. He said if it was his, he would wrap them.

     


    Thank you said by: Spiros Economou

  • Re: 914 exhaust wrapping

    by » 5 months ago


    I've wrapped lots of 912's and a few 914's over the last 15 years and have never had an issue. I truly believe that it helps keep the heat off the wire insulation, hoses and reduce to some degree under the cowl temps. The header wrap Mfg says up to 70%, but we don't always believe MFG, but even if it's 50% of the radiated and convected heat that a lot. The key here is DO NOT over wrap each layer too much or it will retain too much heat. The wrap Mfg says 3/8" over wrap. When I used the wrap on my plane I put temperature strips on the ignition modules and the voltage regulator. It did help. I have never seen a down side.

    Myths about wrap causing breaks are over exaggerated and if it did may be because it was over wrapped too far causing that extra heat retention.

     

    p.s.

    Rotax Owner admins. I love the auto spell check. :) 


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


    Thank you said by: Spiros Economou

  • Re: 914 exhaust wrapping

    by » 5 months ago


    Where do you buy it from?


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