NC Bill Posted February 2, 2011 Report Posted February 2, 2011 Just watched the ASA video ROTAX 912 ENGINE INTRODUCTION with Phil Lockwood. In it he advises that if you are going to use 100LL as primary fuel there are 4 things to do to increase engine life: 1- use dinosaur oil - no synthetics 2- use Declan 3- adhere to 25 hour oil/filter changes & clean bowl at least every 100 hours to remove lead deposits. 4- cruise at 5000RPM or higher The first 3 sound pretty basic. Is running at or above 5000RPM generally agreed?
coppercity Posted February 2, 2011 Report Posted February 2, 2011 Hi Bill, Yes running at cruise at 5000rpm or better is advised, I think the CTLS manual has a warning that if you use 100ll you should avoid prolonged operation below 4800. 5000 is even better, and your prop should be pitched in such a way that you can reach about 5500 at full throttle level flight. The Rotax was designed to run at those RPMs all day long, if your not able to get to those RPMs during normal flight your engine is being loaded to much and can cause eventual damage. I know it is louder in the cockpit, and even seems strange if your coming from Cessna and Pipers but your Rotax will thank you for it!
CT4ME Posted February 2, 2011 Report Posted February 2, 2011 The RPM thing is true, from what I've read, regardless of 100LL. The engine and gearbox was designed to run continuously at a high RPM. Anything less is like lugging a car in high gear... 'won't kill it, but introduces stresses and vibrations that can contribute to a shortening of engine life. I think FD had a service bulletin that warned against lugging the engine on climb-out. Tim
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