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 Posted: Sat Sep 19, 2020 6:15 am Post subject: RotaxEngines-List Digest: 2 Msgs - 09/18/20 |
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I’m no longer in the market for an engine. Please remove me from your list. Thanks!!
On Sat, Sep 19, 2020 at 2:46 AM RotaxEngines-List Digest Server <rotaxengines-list(at)matronics.com (rotaxengines-list(at)matronics.com)> wrote:
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EMail Version of Today's List Digest Archive
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RotaxEngines-List Digest Archive
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Total Messages Posted Fri 09/18/20: 2
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Today's Message Index:
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1. 07:20 PM - Rotax 912 Eating Ignition Modules (Guy Buchanan)
2. 07:27 PM - Re: Rotax 912 Eating Ignition Modules (william sullivan)
________________________________ Message 1 _____________________________________
Time: 07:20:05 PM PST US
Subject: RotaxEngines-List: Rotax 912 Eating Ignition Modules
From: "Guy Buchanan" <gebuchanan(at)cox.net (gebuchanan(at)cox.net)>
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
K-IV 1200 / 912Uls / Warp / 500 hours and flying again.
Now a glider pilot too.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=498422#498422
Attachments:
http://forums.matronics.com//files/labnation_screenshot2_112.png
http://forums.matronics.com//files/labnation_screenshot0_140.png
________________________________ Message 2 _____________________________________
Time: 07:27:33 PM PST US
From: william sullivan <williamtsullivan(at)att.net (williamtsullivan(at)att.net)>
Subject: Re: Rotax 912 Eating Ignition Modules
My gut instinct says clean and tighten all grounds. If a component grounds
through it's base, take off the unit and clean and ground the contact area
. Good luck!
Bill Sullivan
On Friday, September 18, 2020, 10:21:35 PM EDT, Guy Buchanan <gebuchan
an(at)cox.net (an(at)cox.net)> wrote:
t>
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 t
o the modules. We did some testing using an oscilloscope looking for voltag
e spikes in the ground wire during start up and shutoff. For various reason
s 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 30
hz sawtooth. Picture 2 shows the same ground "grounded". We did some furthe
r testing of the input and output to the voltage regulator and those voltag
es appeared relatively clean. Question: is it possible the ignition module
is being damaged by the voltage noise, regardless of source? Should we appl
y some caps to the ground wires to kill the noise?
Thanks,
--------
Guy Buchanan
K-IV 1200 / 912Uls / Warp / 500 hours and flying again.
Now a glider pilot too.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=498422#498422
Attachments:
http://forums.matronics.com//files/labnation_screenshot2_112.png
http://forums.matronics.com//files/labnation_screenshot0_140.png
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