John, does Mode 3 make any difference? You are either all the way down at bottom of its range or it is not working. If not for yourself, You MUST determine which in order for me to sleep at night. Personally, I would not fly the plane until I could get proper mixture at nominal setting of mixture control (12:00). If mode 3 is working, it should make things worse when you go richer. Note that Mode 3 is a fairly fine adjustment. It takes about 25 steps to reach lean limit from nominal. Judging from the predominance of big injectors and high fuel pressure among this group, it sounds as if you guys have all been indoctrinated by Paul Lamar (Bigger & More is Better!) It just ain't so! Remember, we are not pushing the limits of what the engine is capable of, and that's just the way it should be. Tracy ----- Original Message ----- From: Al Gietzen Sent: Thursday, May 06, 2004 4:32 PM To: Rotary motors in aircraft Subject: [FlyRotary] Re: surging I still have a rich mixture problem. Its starting much easier now, and running smooth, but still way too rich. Today I had the mixture knob against the stop (lean) for the entire flight. Once I tried richening it a touch, and the engine faultered immediately. The mode 3 (on the ground) adjustments dont seem to make any difference. I wonder if I need smaller injectors or lower fuel pressure (currently running about 45psi). Thoughts anyone? John Slade I'd find it very hard to believe the need for lower flow injectors for anything except idle. Do the overall lean mode; and redo the MAP correction table. Lot's of envy! Al
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