my experience with lean of peak operations began with my Malibu. Malibu had poor experience with engine cylinders going bad at low times in fact they initially swiched from lycoming to continental for this and other problems. They found that pilots were sloppy about determining lean of peak and toasting jugs. There answer for this was a large temp well marked guage to very carefully, slowly make accurated temp changes and conservatively adj mixture. Our first io550 went to 2060 hours without topping. It was rebuilt (no factory reman) and also went the limit. lesson is to treat engine like a friend.  Now I have a legacy and have a IO 540 with gami's fine tuned to very high standards by Ron Munson. Engine was balanced, and flowed for evenness and preforms magnificienly, smooth, consistent with no problems.   Now- I am not able to go lean of peak at all. in fact i usually run 70 degrees rich (although runs smoothly and happily at 50 ROP) and of course pay for it at the pump.  If I try going lean, the engine runs so rough its scarry. Also at hi power settings  I can detect possible detonation. Hopefully this will bae a 2000hour engine someday. Exhaust and plugs both show a nice brown color so not too rich.  Just my observations. N42DK
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On Thu, Aug 18, 2011 at 7:32 AM, Walter Atkinson <walter@advancedpilot.com> wrote:

Colin:

The course is found at the advancedpilot.com website.  It is not presented by GAMI, but by Advanced Pilot Seminars.

Thank you for your referral and recommendation.

Walter Atkinson

Advanced Pilot Seminars

On Aug 18, 2011, at 5:41 AM, Colyn Case wrote:

goto gami website and take the course.     Besides learning how not to blow up your engine by running "not rich enough" and "not lean enough" you'll learn a bunch of information that may well save your butt in other situations.    Costs less than a jug.    

On Aug 17, 2011, at 7:43 AM, Dico Reijers wrote:

Hi All,

I am new to LOP operations and am looking for some help.  I spoke with some IV-P owners in oshkosh about this and just wanted to get some more info and clarification.

I understand that i should run ROP until altitude, then i can run LOP. The CHTs are supposed to be 390 or less and the TIT 1650 or less. So since i have not made the "big pull" before, i would like to know how exactly is the best way.  Do i set the cruise power, say 30" and 2500rpm, then slowly turn out the mixture... Watch the temps rise ( how hot does it get before it starts to go down again?) and then keep leaning until i get the TIT back to 1650 and CHT to 380ish or below?  How fast should the leaning happen? I understand i dont want to get the chts and tits really hot, so i presume i should be leaning relatively quickly (half a mixture turn per second?)

Has someone ever made a little video with their point and shoot camera of this process while up in the air?  This would be handy for someone new to running LOP.

Thanks all,

Dico

--
Regards,

Dico Reijers

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