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A strange richness...
On our flight to Nevada, I was impressed with the smoothness and
car-like predictability of Jim Burns' start-up technique with his Lycoming IO-540s. Jim had a way to start them that I'd not seen demonstrated before, which I will describe he 1. Fuel pump on 2. Electric primer on for (a few?) seconds 3. Crack throttle 4. With mixture at full lean, start cranking 5. Gradually enrichen the mixture until the engine fires (I may have some of this wrong, as the Aztec has nearly every switch and gauge in bizarre, usually invisible locations...) By using this method, his engines both started without cranking or coughing, just like my Subaru. So, of course, I've been experimenting with this method, which is quite different than the one described in my POH. (Which basically says "crank at full-rich"...) It has worked perfectly several times, especially on hot starts, until yesterday. Yesterday, after a short stop for a piece of pie ala mode at a nearby airport, I primed a few pumps, cracked the throttle, and started cranking with the mixture at full lean. I slowly enrichened the mixture until the engine caught...at which point it ran VERY rough, and did not want to stay running. This condition continued until I LEANED the mixture back, at which point everything returned to normal. I was able to slowly enrichen back to full rich, with no further difficulty. Mag checks were normal, and the flight home -- after a very careful and prolonged run up -- was normal. What happened here? Why did this technique induce an over-rich condition? Theories, anyone? -- Jay Honeck Iowa City, IA Pathfinder N56993 www.AlexisParkInn.com "Your Aviation Destination" |
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