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912 Ignition Failure

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manliker(at)uiuc.edu
Guest

Posted: Mon Apr 30, 2007 10:23 am Post subject: 912 Ignition Failure

This happened during my pre-flight magneto check.  At about 3500 rpm, switched to Mag A, and rpm’s rose.  Don’t recall how much, but remember thinking to myself, “that’s weird”.  Switched back to both Mags...don’t recall exactly, but I think engine was running rough.  Switched to Mag B, and rpm’s seriously dropped.  Then switched to both mags again, and engine shortly quit, and would not restart.  This all happened within about 15 seconds or so, and as you might guess, was unexpected.  

   

Any and all advice and/or condolences is welcomed.  My question, though…does the fact that both “mags” (ignitions) failed possibly point to a particular component that may have failed?  I’m in the “infancy” stage of troubleshooting this, so all opinions/experiences are welcome.  I realize the wiring associated with the ignition control modules are a known weak link.  

   

Here’s the installation.  It’s a 80 hp 912 on a Series 5 Kitfox.  Both engine and airframe have about 100 hrs on them and have been in service for 1 year.  Ignition system was installed as per the Kitfox manual, that is it’s mounted on the engine with the rubber isolation mounts.  I realize others have moved the ignition modules to other locations (engine mount, or firewall).  That may be in my future.  Engine is circa 1998 or thereabouts.  

   

I did notice that the cap screw mounting one of the four ignition module mounting brackets to the intake manifold was loose.  It’s the same mounting bracket that all the black leads from the ignition modules and/or coils are attached.  So there may have been an issue with inadequate grounding (I’m assuming “grounding” based on the color=black of the wires).  

   

Anyway, like I said…any and all advice is appreciated from those who have already dealt with this.  

   

Thanks,  

   

Mark Anliker  

Sadorus, IL  

217-898-4766  

      [quote][b]

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lcfitt(at)sbcglobal.net
Guest

Posted: Mon Apr 30, 2007 11:55 am Post subject: 912 Ignition Failure

Mark,



I too would suspect the ground as being the problem.  I have not experienced 

your failure so am interested in all the responses.  When building, I 

envisioned the grounds running across the isolation mounts to be a weak 

spot, so they were mounted to the bolt on the module side of the mount and 

ran some pretty hefty braid across the isolation mount.



Lowell Fitt

Cameron Park, CA

Model IV-1200 R-912 UL Warp

1998 850 hrs.



---

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crazyivan

Joined: 25 Aug 2006
Posts: 62
Location: Pensacola

Posted: Mon Apr 30, 2007 1:54 pm Post subject: Re: 912 Ignition Failure

There are a few Rotax Service Bulletins with regard to ignition module failures.  You might want to search the database for your engine serial number:  http://www.rotax-owner.com/sdocs.htm

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Dave
Piper PA-22/20

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