Bob,
 Several things here! First, 50° rich of peak is standard for Lycosauruses. Tracy has been getting much better economy 50° lean of peak which the ROTARY likes just fine. EFI on the rotary can be set up in various ways. If you run a system with a O2 sensor standard it leans itself to at or near stoichiometric mixture. No problem with air in the exhaust. Mistral a company certifying the rotary, has been using lean-of-peak mixtures with it's digital EFI all along to improve mileage/efficiency. Also no trouble. If you run Tracy's EFI controller you could set it up rich enough to cause problems but the engine would be no where near peak power.
Bill Jepson

In a message dated 3/9/2005 7:02:51 PM Eastern Standard Time, Bob White <bob@bob-white.com> writes:

>
>Hi Bill,
>
>I've had the impression that the mixture should be set on the rich side
>of peak for TO and climb and on the lean side of peak for best economy
>cruise.  If on the rich side, there would be extra fuel in the
>exhaust.  Am I wrong in this assumption, or is the proper setting close
>enough to peak  that it doesn't make much difference?  One of these
>days I'm going to need to know this stuff.  :)
>
>Thanks,
>Bob W.
>
>
>On Wed, 09 Mar 2005 18:37:42 -0500
>WRJJRS@aol.com wrote:
>
>
>> Georges, and Gail,
>>  On this issue you are incorrect, when we lean the mixture using EFI we are looking for '0' oxygen remaining or complete combustion. Adding air well after the exhaust exits the ports will not "afterburn" the mixture unless there is too rich a mixture to begin with.
>> Bill Jepson
>
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>http://www.bob-white.com
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