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RotaxEngines-List Digest: 2 Msgs - 09/18/20

 
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PostPosted: Sat Sep 19, 2020 6:15 am    Post subject: RotaxEngines-List Digest: 2 Msgs - 09/18/20 Reply with quote

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:

Quote:
*

 =========================

   Online Versions of Today's List Digest Archive

 =========================

Today's complete RotaxEngines-List Digest can also be found in either of the

two Web Links listed below.  The .html file includes the Digest formatted

in HTML for viewing with a web browser and features Hyperlinked Indexes

and Message Navigation.  The .txt file includes the plain ASCII version

of the RotaxEngines-List Digest and can be viewed with a generic text editor

such as Notepad or with a web browser.

HTML Version:

    http://www.matronics.com/digest/digestview.php?Style=82701&View=html&Chapter=2020-09-18&Archive=RotaxEngines

Text Version:

    http://www.matronics.com/digest/digestview.php?Style=82701&View=txt&Chapter=2020-09-18&Archive=RotaxEngines

 =======================

   EMail Version of Today's List Digest Archive

 =======================

           ----------------------------------------------------------

                           RotaxEngines-List Digest Archive

                                      ---

                     Total Messages Posted Fri 09/18/20: 2

           ----------------------------------------------------------

Today's Message Index:

----------------------

     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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