----[Please read http://ercoupers.com/disclaimer.htm before following any advice in this forum.]----
In planes without an EGT, I always did the lean till it runs rough, then richen till smooth technique. I would err a little to the rich side. My O-200 coupe has a 4 pt EGT (#2 is always the highest CHT/EGT.) I lean slowly to peak, then richen 100 degrees for "best power". It seems to always be about 1500 degrees F. "Best economy" would be 50 degrees rich but that results in higher CHTs. I prefer the cooler CHTs - gas is cheaper than cylinders. The fuel burn difference is minimal. I run mine at 2400-2450 and see cruise speeds averaging 90-95 knots. With proper leaning I get 3.2-3.4 hours on my wing tanks including climb and descent. I leave it full rich for climb to manage CHTs except in high/hot conditions. When I left Las Vegas on a 120 degree afternoon this summer, I had a density altitude of over 6,000 feet. Leaning at the run up gave me a lot more RPMs on my take-off. I have heard that some people can run their 0-200 lean of peak by tweaking the mixture and throttle, but mine gets too rough to do that. I would also recommend leaning very aggressively on the ground to avoid fouled plugs. I run exclusively 100LL and always lean to the point where the engine gets rough above about 1200rpm for taxi. Just last week I pulled my plugs and with 100+ hours of operation in the past 9 months, there wasn't a trace of lead deposits. A club-flown 152 was in my hangar for a plug cleaning after only 50 hours and the bottom plugs were jammed full of lead deposits. Hope this helps: Tim Erco 415G N94413 -----Original Message----- From: stephen coffey [mailto:[EMAIL PROTECTED] Sent: Monday, September 20, 2004 2:23 PM To: [email protected] Subject: [COUPERS-FLYIN] leaning mixture ----[Please read http://ercoupers.com/disclaimer.htm before following any advice in this forum.]---- This is probably more for the 0-200 / C-90 crowd than the C65/75/85, but maybe not. Quite honestly, I never thought about it too much in a rented 150 or 172. I've had the discussion of methodology with a couple of folks, and gotten different answers. What is your chosen methodology for achieving "proper" mixture? Stephen Coffey ========================================================================== == == To leave this forum go to: http://ercoupers.com/lists.htm Search the archives on http://escribe.com/aviation/coupers/ ========================================================================== ==== To leave this forum go to: http://ercoupers.com/lists.htm Search the archives on http://escribe.com/aviation/coupers/
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