FMay Posted August 25 Report Share Posted August 25 EMS-D120 GPH fuel display is showing 8-9 GPH in level flight at 5250 rpm. The book doesn’t show how to change fuel consumption . Only adding gallons of fuel to the monitoring system. Does anyone know how this can be changed? Quote Link to comment Share on other sites More sharing options...
Tom Baker Posted August 25 Report Share Posted August 25 It is done by changing the K factor in the set up. Do you know if the fuel flow transducer has been replaced? Anyway, the instructions are on page 5-14 of the EMS D-120 Installation Manual. Quote Link to comment Share on other sites More sharing options...
FMay Posted August 25 Author Report Share Posted August 25 Thanks Tom Quote Link to comment Share on other sites More sharing options...
EricB Posted August 28 Report Share Posted August 28 On a related note, does anyone have figures for "normal" and "high" fuel flow? My normal looks good ranging from 4.6 at low power to 5.3 at higher power settings BUT I've been getting "Fuel Flow High" alarms for a few seconds on takeoff just before liftoff. Self cancels after only a few seconds but distracting during a critical phase of flight. Dynon is set at 10.3 for HIGH flow alarm. Rotax manuals seem silent on the subject. Quote Link to comment Share on other sites More sharing options...
Anticept Posted August 28 Report Share Posted August 28 That's normal and seen everywhere. You'll notice it coincides with fuel pressure changes. I standby my belief that we have vapor issues that get trapped in the fuel pump and take a moment to clear. Once the vapor is pushed out and hits a carb, the whole system has a momentary speedup of fuel flow due to rapid displacement of gas. Quote Link to comment Share on other sites More sharing options...
FlyingMonkey Posted August 29 Report Share Posted August 29 22 hours ago, EricB said: On a related note, does anyone have figures for "normal" and "high" fuel flow? My normal looks good ranging from 4.6 at low power to 5.3 at higher power settings BUT I've been getting "Fuel Flow High" alarms for a few seconds on takeoff just before liftoff. Self cancels after only a few seconds but distracting during a critical phase of flight. Dynon is set at 10.3 for HIGH flow alarm. Rotax manuals seem silent on the subject. Just curious, what RPM numbers are you using for "low power" and "high power"? IIRC the 912ULS docs from Rotax list cruise RPM numbers down to 4600rpm, which would be very low fuel consumption, around 4gph. Up at the high end I think you can get the engine to burn around 6gph, but you're at a setting that doesn't buy you any appreciable speed more than a lower RPM around 5.3-5.5gph. Quote Link to comment Share on other sites More sharing options...
EricB Posted September 4 Report Share Posted September 4 High power would be 5000 - 5300 or so Low power 3500 or so. In between , call it medium Quote Link to comment Share on other sites More sharing options...
FlyingMonkey Posted September 8 Report Share Posted September 8 On 9/4/2024 at 1:16 PM, EricB said: High power would be 5000 - 5300 or so Low power 3500 or so. In between , call it medium Really? 5000-5300rpm to me is normal cruise power, above 5400+rpm would be "high power". Anything 4800rpm or below is "low power" in my mind. 3500rpm is really, really low power, nobody would cruise at that power setting unless they're trying to keep pace with an ultralight. If you are burning 4.6gph at 3500rpm (the "low" fuel flow you mentioned), you need to check for fuel leaks! (or more likely check your flow calibration) I occasionally fly alongside a buddy in an Avid at 3800-4000rpm, and I bet my fuel flow is about 3.8-4gph. Quote Link to comment Share on other sites More sharing options...
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