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The Rotax MMH (for 912 etc) specifies Loctite (copper-based) anti-seize compounds for coating the exhaust system couplings, flanges, and mounting bolts etc.  But it seems nickel-based compounds are kinder to stainless steel at elevated temperatures.  I am interested in any experiences and/or opinions on this.  In particular the appropriate compound for coating the exhaust manifold pipe where it enters into the aluminium cylinder block.

  • Re: Nickel vs Copper based anti-seize

    by » 3 weeks ago


    I'd stick to Rotax's recommendations, if only for warranty coverage.


  • Re: Nickel vs Copper based anti-seize

    by » 3 weeks ago


    Hi all

    The Loctite specs clear this up.  Copper base is the lowest temperature protection. Silver can be Aluminum or Nickel based, Nickel has the highest temperature tolerance.  The best go-to therefore in my opinion is the Nickel.  The concept is that it will not spread or dissipate as fast as the Copper version.  When you look at the temperature of an exhaust joint in theory they all will work.

    Cheers


  • Re: Nickel vs Copper based anti-seize

    by » 3 weeks ago


    I'm  with RW. Nickel anti seize for the stainless exhaust. 

     
     
     
     
     

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


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