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Hi,

I was wondering what is the normal range of the manifold pressure for Rotax 912 iS Sport? and the power setting per RPM/manifold pressure

I see that the 912 ULS operators manual does have manifold pressure as part of the Performance data - see attached

https://www.rotax-owner.com/pdf/OM_912_Series_ED4_R0.pdf

Strange that for the iS engine that has the manifold pressure data reading in the EMS, Rotax will not spec the normal manifold pressure range in the 912 iS operators manual

1. How do variable pitch propeller owners set their power and pitch for iS?

2. How off will it be to assume the 912 ULS values will also apply for the 912 iS?

 

8804_1_912 ULS engine performance.png (You do not have access to download this file.)
  • Re: 912 iS Sport manifold pressure

    by » one month ago


    .Manifold pressure depends on throttle setting density altitude etc. At sea level I can see 28" at WOT fully fine prop, but at 10,000 ft same settings only gives 21" ?

    Yes MAP is the gauge generally used foe VP props, although I have found as the IS engine ECU is so good that I default to fuel flow. The attached is NOT from the IS Manual, I cannot remember where I got it from !

     

                       
               
               
               
                     
                       
      ZZ (rpm) (Kw) (Hp) (Nm) (ft.lb) (in.Hg) l/hr  
      Take off power 5800 74 100 121 90 Full throttle 26  
      Max continuous 5500 72 98 126 93 Full throttle 25  
      75% 5000 55 73 103 76 25 20  
      65% 4800 47 64 93 69 22 17  
      55% 4300 36 49 79 58 18 13  
                       
               
               
             
                     
                       
                       
                       
                       
                       
                       
                       
                       

     

    30477_2_912IS Sport Performance.jpg (You do not have access to download this file.)

  • Re: 912 iS Sport manifold pressure

    by » one month ago


    You might find THIS old discussion interesting.

    It is specific to the 914 but the idea will be the same for the ULS by adjusting the numbers.


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


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