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1. 09:52 PM - Rotax 912 Eating Ignition Modules (Guy Buchanan)
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| Subject: | Rotax 912 Eating Ignition Modules |
A friend has a 912uls in a Kitfox that seems to be eating ignition modules. He's
gone through three. Yes they were all old. Yes new ones work, but we're worried
that maybe his plane is producing electrical noise detrimental to the modules.
We did some testing using an oscilloscope looking for voltage spikes in the
ground wire during start up and shutoff. For various reasons we weren't able
to capture any voltage spikes during start and stop, but did capture some very
messy noise signatures while running. Picture 1 shows one module's ground wire
while "open". Note +/- 30V peaks and a regular 30hz sawtooth. Picture 2 shows
the same ground "grounded". We did some further testing of the input and output
to the voltage regulator and those voltages appeared relatively clean. Question:
is it possible the ignition module is being damaged by the voltage noise,
regardless of source? Should we apply some caps to the ground wires to kill
the noise?
Thanks,
Guy Buchanan
gebuchanan@cox.net
--------
Guy Buchanan
K-IV 1200 / 912Uls / Warp / 500 hours and flying again.
Now a glider pilot too.
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http://forums.matronics.com/viewtopic.php?p=498392#498392
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