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#1
May 5th 05, 01:13 AM
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I sometimes check mags at cruise power in the air - but only over flat
country. I also occasionally check them at idle on the ground to keep track of the condition of the points. One caveat is if you get a rough engine that is fixed by going to one mag, don't experiment with the BOTH position again. One fellow I knew did that on a 182 and had an exposion in the intake manifold that blew off some of the intake system hoses. The integrity of the intake system is critical to maintaining a semblance of the correct mixture and the open port(s) made things so lean he couldn't recover power. The range of spark ignitable mixture is less than three to one air/fuel ratio (from about 8:1 to maybe 20:1 by weight). 
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