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  #11  
Old 12-13-2011, 05:31 PM
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longranger longranger is offline
 
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Default

Quote:
Originally Posted by jetjok View Post
Yep...Thanks, Miles.
I do believe that voltage is a function of the number of windings in the secondary circuit. The spark plug gap has nothing to do with secondary voltage output of the mag.
Secondary coil voltage capability is a function of several things, including the number of windings in the secondary (actually the secondary/primary winding ratio). Though the spark plug gap doesn't determine the secondary voltage capability, it does set the upper limit for the voltage on a given firing. Once that voltage is reached and the spark jumps the gap, the secondary coil begins to discharge and voltage goes no higher.
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  #12  
Old 12-16-2011, 11:02 AM
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Default How High?

Quote:
Originally Posted by speyers View Post
Wanted to know if anybody has some field experience using both Slick 4300 or 6300 series magnetos vs. the Bendix 1200 series.
Looking at running LOP at high altitudes with an IO-540 Lycoming engine on an RV-10.
Not sure how high you are interested in flying. Personal experience- no trouble at 17500, winter time with the Bendix. But then that high, there is so little air (naturally aspirated) that LOP isn't really necessary or wanted, since fuel flow and power is way down anyway. Also, I don't consider overhaul cost of the Bendix much of a downside. Haven't ever done an overhaul, but I've done several IRAN's and they don't cost much at all.

Mike Busch wrote a nice article on high altitude mag considerations.http://www.avweb.com/news/savvyaviat..._194870-1.html

If you haven't given it thought already, might consider a modern ignition system in at least one side. I do think there is some consensus that electronic ignition in general offers a spark deeper into LOP than magnetos. But, that isn't the only consideration.... well balanced injection is critical as well.
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  #13  
Old 12-16-2011, 10:54 PM
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Default EI

Strongly recomend Electronic Ignition, however if mags are what you want then the 1200 series Bendix are the way to go. they are superior to slick or other bendix mags in all aspects with the caveat that they are a bit larger. Good Luck, Russ
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  #14  
Old 12-18-2011, 10:18 AM
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speyers speyers is offline
 
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Default Thanks

Thanks for all the replies. Very informative. Wish they had a P-mag for the IO-540, that would be the ticket!
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