912iS RPM vs MAP

by Clyde Poser in 912iS Technical Questions 8 months 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 Jason Fish » 8 months ago

Jason Fish

11 35 136

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 Phil Southerden » 8 months ago

Phil Southerden

0 4 6

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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912iS RPM vs MAP

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