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Leigh, Mixture control theory and practice could use up a hundred messages. Here are my thoughts: 1. If I had a low-sensitivity gauge, then I'd upgrade and get a 4-cylinder 1° digital gauge. 2. If I already had a high-sensitivity single probe gauge, then I'd keep it (unless I had lots of money) but I wouldn't push the mixture too close to the peak. 3. If you have a 4-probe gauge, you could lean by the leanest cylinder and run it closer to the peak. In Voyager, flying around the world, they leaned to "Dick's lean" which was on the lean side of peak, right on the edge of detonation - it's good that they did because they had nearly zero margin. With that expert control, they had a VERY lean mixture yet didn't ruin the engine. Most recommendations are to lean to 50° on the rich side of peak for cruise. This is a pretty good lean but doesn't risk detonation. That's especially important if you have a single probe gauge because you never know which cylinder is leanest at the moment. I'm told the leanest cylinder changes with temperature, altitude, power, rpms and maybe more. You're pretty safe at 50° rich of peak. With four probes, you could lean closer to peak with confidence but you may choose to stay cautious and only go to 50° rich of peak anyway. For climb and high power takeoffs, the references I read said 100° rich of peak gave best power and that's not difficult with any gauge. Does that answer your question? Ed Burkhead http://edburkhead.com/ [EMAIL PROTECTED] (remove the QQQ) -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Sent: Tuesday, February 17, 2004 8:43 PM To: [email protected] Subject: [SPAM] [COUPERS-TECH] Which EGT/CHT to use? I am looking for recommendations on whether I should upgrade from the single probe CHT gauge I currently have to either a multi-probe CHT or EGT. What are others using? Thanks, Leigh ========================================================================== ==== To leave this forum go to: http://ercoupers.com/lists.htm Search the archives on http://escribe.com/aviation/coupers-tech/
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