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Starting 912is with EFIS on

in 912iS Technical Questions 8 years ago

  • Re: Starting 912is with EFIS on

    by » 8 years ago

    Forgot to say I will check the "normal" next flight
      
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  • Re: Starting 912is with EFIS on

    by » 8 years ago

    Thanks for the feedback. That's what I was hoping to hear - will switch over the wiring so that the EFIS is connected to the main/master bus (to monitor oil pressure on start).

    Joe - I can't hep you yet with the low fuel pressure issue, however as soon as I am flying in the next couple of months I can let you know how mine goes. I would have thought (under all flying conditions) the fuel pressure should remain fairly constant (around 45psi) as there would always be sufficient power generated to run the fuel pump(s) at the appropriate level?
      
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  • Re: Starting 912is with EFIS on

    by » 8 years ago

    Not to steal the thread, but about Fuel psi; perhaps for testing you should install an accurate mechanical gauge just before the final
    filter for comparison with the EFIS. On my 5600 installation I found that the EFIS did not require any offset calibration. At 2000
    rpm while moving about I show 45 PSI. At takeoff and cruise power the pressure drops to 43-44 psi as the engine is using more fuel. It has never dropped below 42psi. One time I got the dregs from the airport fuel tank and after 2 hrs of flight the pressure went to 46 psi.
    So that required a filter change.
      
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  • Re: Starting 912is with EFIS on

    by » 8 years ago

    Hi Guys,
    re fuel pressure. Just back from a 4.8 hour flight

    https://go.spidertracks.com/fleetpro/public/glennnmartinltd/tracks

    Fuel pressure was lowest at low idle 38.5 Psi and highest before start and at max power climb at 44.2 Psi. Normally at cruise was 42 PSI.

    I also found an article by Michael Stock a ROTAX guru from Germany with a trace of fuel pressure. it varied from 2.4-3.2 Bar (29-46 PSI) an he considers this Normal.

    So I do not think there is a problem
      
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  • Re: Starting 912is with EFIS on

    by » 8 years ago

    This engine won't run on low fuel pressure and if you lose fuel pressure it stops in about 1-2 seconds. It may be time to question some of the pressure readings. Could be the sender, the instrument, poor connection and or poor ground. With a pressure that swings from 29-46 psi I would want to know why. This engine should not be having pressure swings like that. 1-2 psi is one thing, but 10-15 psi is an issue somewhere.

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

      
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