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helili(at)chahtatushka.ne
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 Posted: Fri Jan 23, 2009 3:13 pm Post subject: Magnito/RPM wierdness. Any ideas? |
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I'm not knowledgeable of the Rotax engines, but from your description, I
would start looking at the meter circuitry ground. It's not uncommon to get
a higher than normal indication of voltage in a circuit with a floating
ground, whether its AC or pulsating DC.
John Hart
KF IV, NSI Subaru
Wilburton, OK
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larry huntley
Joined: 19 Jul 2008
Posts: 149
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| Posted: Fri Jan 23, 2009 4:49 pm Post subject: Magnito/RPM wierdness. Any ideas? |
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That sounds like an interesting problem. What was causing it? Should be no
connection,direct or indirect between the master switch and the magneto,
should there? Larry Huntley
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_________________
Larry Huntley,Dundee,NY
Kitfox 4-1200 N234EE
EA81,AMAX Redrive Warp 3 blade |
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815TL
Joined: 10 Oct 2008
Posts: 62
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| Posted: Sat Jan 24, 2009 5:40 am Post subject: Re: Magnito/RPM wierdness. Any ideas? |
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Thanks everyone. If it warms up a little, I will check out the ground, and make sure it is all good.
Anyone know where the common ground is for the mags? Would it be off the mag itself, or off the Tach?
Andrew
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Tom Jones
Joined: 12 Mar 2006
Posts: 752
Location: Ellensburg, WA
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| Posted: Sat Jan 24, 2009 6:19 am Post subject: Re: Magnito/RPM wierdness. Any ideas? |
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| Quote: | Anyone know where the common ground is for the mags? Would it be off the mag itself, or off the Tach?
Andrew |
Andrew, the "Kill wires" coming out of the mag are black with yellow stripe. Those wires each go to a mag switch/s. They are wired so that they are grounded when the switch is on. Follow the wires back from the switches to find where they are grounded. Of course you know that the mag switches kill the ignition when they are on or closed and the ignition is on when the switch is open or off.
The tack problem may be due to a loose or corroded ground else where in the system. I would check the main engine to airframe ground strap.
Here is a link to a good explanation and diagram of the Ducati dual ignition. It is a very well designed ignition system. \
http://www.800-airwolf.com/pdffiles/ARTICLES/part32.pdf
Where it says the mag check should be done at no more than 400 RPM is a typo. Should be at no more than 4000 and my rotax manual says do the mag check at 3000 RPM.
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Tom Jones
Classic IV
503 Rotax, 72 inch Two blade Warp
Ellensburg, WA |
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