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912iS RPM vs MAP

in 912iS Technical Questions one year ago

Rotax in there infinite wisdom does not provide an RPM vs manifold pressure chart.  So if a constant speed prop is installed what would be the limitations on RPM vs MAP?

It is recommended to not set a fixed pitch prop below 5200 due to high MAP.  Now with a constant speed prop is there no danger in high MAP?  

  • Re: 912iS RPM vs MAP

    by » one year ago

    I don't recall where I got these screenshots, but I can't find the graph or table in the current manuals.

    Oops, just noticed these are for the ULS. Huh, well, then I dunno either.

    37391_2_Rotax Power Settings.jpeg (You do not have access to download this file.)
    37391_2_Rotax RPM vs MAP.jpg (You do not have access to download this file.)
      
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  • Re: 912iS RPM vs MAP

    by » one year ago

    We have had issues with high EGT's when operating at low RPM and MAP causing softening in the muffler and constriction resulting in reduced power. If operating below 5000 rpm I would watch EGT very closely.

      
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