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#1
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"dual magneto"
Hello,
reading the "no RPM drop..." thread gave rise to a question: what is the benefit (if there is any) of the "dual magneto" (two magnetos in a single housing) installation? Should these kind of installation be preferred, or avoided (if there is a choice ;-)? Thanks in advance for the answer.. Regards Kai -- Return address is invalid to help stop junk mail. |
#2
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Kai Glaesner wrote:
reading the "no RPM drop..." thread gave rise to a question: what is the benefit (if there is any) of the "dual magneto" (two magnetos in a single housing) installation? Should these kind of installation be preferred, or avoided (if there is a choice ;-)? While the mechanical drive to a magento can fail, it's not a likely failure. The main reason there are two magenetos is not so much that the magnetos themselves fail often, but something in the entire ignition system connected to that magneto fails. Since magneto's are pretty weak sparks, the usual culprit is some fouling of the spark plug. |
#3
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"Kai Glaesner" wrote in message . com...
Hello, reading the "no RPM drop..." thread gave rise to a question: what is the benefit (if there is any) of the "dual magneto" (two magnetos in a single housing) installation? Should these kind of installation be preferred, or avoided (if there is a choice ;-)? Thanks in advance for the answer.. Regards Kai The dual mag leaves more room on the accessory case for other stuff like vacuum and fuel pumps and so on. The drawbacks include more difficult maintenance, as the two mags must be timed in accordance with each other, and if the timing's off the mag has to come off and be opened up to reset it. With two separate mags it's a matter of loosening whichever mag is off and rotating it a bit to get it into agreement with the other and with the engine. Further, these mags are often on engines in tight compartments, surrounded by hoses and cables and wires and sharp pointy things (like safety wire) and engine mount tubes and other accessories and shoved up against the firewall, making life unpleasant for the mechanic. We have one on a 182RG and I dislike it intensely. The other drawback is the single drive. There was an AD years ago against the impulse drive springs in these things; they'd corrode and fail, retarding the timing on both mags to TDC or worse, and the power would drop to some useless value. Occasionally we hear of another one quitting and remember that lots of owners are ignoring ADs at their peril. Dan |
#4
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"Kai Glaesner" wrote in message . com...
Hello, reading the "no RPM drop..." thread gave rise to a question: what is the benefit (if there is any) of the "dual magneto" (two magnetos in a single housing) installation? Should these kind of installation be preferred, or avoided (if there is a choice ;-)? They should be avoided. They have a nasty problem of falling off. Mooneys and Arrows have had this problem. Most have since been change over to two different mags. I think the benefits were easier installation and less area to pressurize (for those mags that are pressurized). -Robert |
#5
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another consideration is that the LASAR electronic ignition cannot be fitted to
engines with the two-in-one dual mag. It is only available for separate mags. -- --Ray Andraka, P.E. President, the Andraka Consulting Group, Inc. 401/884-7930 Fax 401/884-7950 http://www.andraka.com "They that give up essential liberty to obtain a little temporary safety deserve neither liberty nor safety." -Benjamin Franklin, 1759 |
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