April 2009 Issue
Iíd like to add some experience to your report on Power Flow exhaust system article in the February 2009 issue. We installed a Power Flow exhaust on our 1976 Cessna 172M about eight years ago. Itís been long enough that I canít provide any reliable performance improvement numbers, but what I read in your article is about what we experienced. A significant advantage is the ability to lean more with our Lycoming O-320-E2D. I advise all our pilots to lean aggressively. We installed an engine monitor and discovered that the only engine or flight mode that causes heat problems is high-altitude Vy climb, when the lower density of the air doesnít provide adequate cooling below 70 knots or so. This is at altitudes above the stock service ceiling of the 172.
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