> "Bummer to hear that you had problems with the Rotec TBI." > " Whenever I climb above 9000 feet, it would start to lean out." It took me some time to understand that my EFS-2 automatically leans with altitude. Never to the extent that it affects engine operation in any negative way. I simply had to learn to leave the mixture lever alone for all day-to-day operations. Once at cruising altitude of 11 to 14K, careful touching of the mixture control _can_ render a few more RPM's and it's a constant temptation at those altitudes to do so. Playing with fuel flow and tach is rewarding. One could though not touch the mixture at all, for anything, without any penalty.
How the Ellison does this is probably obvious to some. With the rest of us it remains a bit of engineering sorcery. **************************** At those altitudes a normally aspirated engine is producing probably no more than 55%. At such low settings there's nothing that can be done with the mixture that will negatively affect temperature, is there? It's cold outside and the engine is hardly working. Where is the friction (heat) coming from? MikeKSEE
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