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Rowan,
You're basically doing the same thing that I do to prevent stage cooling. It would be poor form to open cowl flaps on a descent, and it's best to try and descend without touching the power settings, as you do. But, instructors would probably call us extreme, and that you can safely decrease manifold pressure about 2" every few minutes without doing any harm. Then again, they're not paying for the overhaul.
I think your habit of cooling the motor on the ground is an excellent one--especially if you've landed in Phoenix in the summer. It's probably just as important when you land in sub-zero temperatures in the winter. This gives the different alloys in the heads and cylinders a chance to cool at a similar rate and avoid wear. I'd like to hear from an experienced A&P on this one.
Thanks.
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DJSchaut
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DJSchaut
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