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Kyle:
Yes, as you pay more attention to the engine, you will begin to want better data on its function. It goes with the territory of good engine management. Sorry. <g>
As for reducing rpms moving the thetaPP toward TDC, yes, that is correct. The effect of reducing rpms 100-200 is very small on thetaPP, however, and I tolerate that for noise abatement. If that's not an issue, I leave the rpms full forward. Throttle has more effect on thetaPP than rpms and mixture has the largest effect of all.
Those of us who are familiar with these effects will compromise on the noise abatement issue with slightly reduced rpms with the undertanding that it's not optimal, but an acceptable compromise.
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Walter Atkinson
Advanced Pilot Seminars
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