Claude, This is approximately the same response and numbers as on my Alon's C-90. What I have read is that as long as you are developing less than 60% power, it is virtually impossible to hurt the engine with improper leaning. Check with the Continental engine manual, but at 6000 feet I don't believe you can develop more than 60%, unless it is extremely cold. Therefore, it is possible to lean to peak EGT if the engine runs smoothly enough and you are satisfied with the power output. Theoretically, you will get peak power somewhere around 50 to 150 degrees rich of peak, but I can't detect much difference.
What I do is take off full rich, lean to approximately 1250 to 1300 as soon as I establish a cruise climb, then for smooth operation just rich of peak during cruise. Due to the carburetion and metering setup, the peak is very broad at normal cruising altitudes, so I lean for smooth operation then check EGT, CHT, and OIL temperature. At 9000 feet plus, leaning becomes much more critical, but the EGT still is not useful as the seat of the pants feel with a look at temperatures to make sure everything is OK. David N6359V [EMAIL PROTECTED] wrote: > > Hello all! > I was wondering what would be considered a safe peak for the EGT with the > engine still running smoothly. At about 6000 at cruise full rich mine is > running around 1250 to 1300. I can leat to 1400 and get a 150rpm increase. > >From 1400-1450 there is no change and higher it will lean and get rough. So > I target 1400 and leave it there. Is this too hot? With the 85 at 2150rpm it > drinks about 4.7 gph and I'm happy with that. --------------------------------- to unsubscribe send mailto:[EMAIL PROTECTED] _____________________________________________________________ Check out the new and improved Topica site! http://www.topica.com/t/13
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