Originally Posted by Mauritz
Today while I was busy with transition training (40 minutes in the flight) the Rotax engine started losing power at about 100ft AGL in the climb. I fly with 95 Shell Mogas. The engine has run for about 10 hours now, the tank was about half full, however the outside temp was 36.5⁰C or 98⁰F. As a result of the extreme heat in our part of the world I have moved the oil-cooler an inch forward which definitely help with the oil temperatures.
Did anybody experience this in extreme heat conditions? Is there a possibility that the fuel lines became too hot and resulted in the engine losing power? This was now the 2nd occurrence in extreme heat conditions and don’t want to fly any further until I have found the problem and or the solution.
Sorry to hear that, Mauritz. I can imagine how unnerving that must have been for you.During the summer in Tucson we easily reach 100degF and more and I have not experienced any issues during touch-gos or extended climbs. I too have moved my oil cooler about an inch forward, away from the muffler, and I run on highest octane Mogas most of the time. I have a switched fuel pump and I never run it unless the tank level is below 8 gallons or to pressurize the system before engine start.
So even during the searing heat of the summer I was not actively pushing fuel through the system to avoid vapor lock during my flights. However, after a flight and some time on the tarmac I do need to flush the system with the pump on to ensure a proper engine restart.
Hope you find the culprit soon!