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My airplane runs a Rotax 582 gray head engine and unfortunately I don't have access to ethanol free unleaded auto fuel. My airplane is a Pulsar and my fuel tank  is composite meteral and is not ethanol safe, so running any amount of ethanol is not desired.  I have been running 100LL and have recently heard about 4-stroke Rotax users using 100LL with Decalin additive with good success.  So my question is this.  if I run 100LL in a 582, should I be using the Decalin additive like the 4-stroke guys use?

 

Thank you

Alan

  • Re: Decalin Additive Rotax 582

    by » 7 months ago


    According to this, a Sunoco near you sells E0 unleaded 91: 

    https://www.pure-gas.org/index.jsp?stateprov=CO


  • Re: Decalin Additive Rotax 582

    by » 7 months ago


    In my opinion, any Rotax engine consuming 100LL would benefit from the use of Decalin.


  • Re: Decalin Additive Rotax 582

    by » 7 months ago


    It depends on your configuration.  

    Decalin converts the lead to lead phosphate, which goes out in the exhaust in a sort of (carcinogenic) powder.  Without it, lead oxide accumulates in the oil, on valves, etc.  However, I know a CFI (and Rotax heavy-rated mechanic) who claimed that the powdery lead phosphate started to cake on the flex hoses in his particular exhaust system, which made them stiff and untimately caused them to fail. So he has resigned himself to using 100LL without Decalin, and just changing the oil a lot more often.


  • Re: Decalin Additive Rotax 582

    by » 6 months ago


    I doubt that the Declin will be of benefit to a two stroke. There are no hot poppett valves nor oil circulatory system to contaminate. I know racing two stroke bikes whom used 100LL with no problems. However I do not have any longterm exerience myself others might.

     


  • Re: Decalin Additive Rotax 582

    by » 6 months ago


    I agree with Glen!
    A two stroke does not have any Oil to contaminate, it is constantly being replaced.
    There are no Valves.
    What exits the cylinder goes out the exhaust along with the Oil Spray.
    100LL in a Two Stroke should Not be any problem.

    And as Tyler posted,  UL91 E-0 is available at the Sunoco right in town.
    It is probably labeled as "Boat/Marine Fuel" on the pump.


    Bill Hertzel
    Rotax 912is
    North Ridgeville, OH, USA
    Bill.Hertzel@Yahoo.com
    Clicking the "Thank You" is Always Appreciated.


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