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Mag Ground

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Vic Peters

Joined: 30 Oct 2009
Posts: 54
Location: Millinocket, Maine

Posted: Wed May 18, 2011 5:46 am Post subject: Mag Ground

All,

In the past I have run my 912UL without plugs and or wires not

connected to fill gas lines and bring up oil press. didn't know

it was a no no.

If I have caused a problem what would the symptoms be?

_________________
Vic
912ul Xtra
Maine
Too old to cut the mustard but not the cheese.

rickofudall

Joined: 19 Sep 2009
Posts: 1392
Location: Udall, KS, USA

Posted: Wed May 18, 2011 8:33 am Post subject: Mag Ground

Vic, If your ignitions are still working you got away with it. There's a diode in the circuitry that takes the current when a plug tries to fire ungrounded and gets cooked. With it gone the ignition will be dead and since it's encapsulated the only fix is to replace the ignition module. 



Rick Girard



On Wed, May 18, 2011 at 8:46 AM, Vic Peters <vicsv(at)myfairpoint.net (vicsv(at)myfairpoint.net)> wrote:

 	  Quote: 	
		   --> RotaxEngines-List message posted by: "Vic Peters" <vicsv(at)myfairpoint.net (vicsv(at)myfairpoint.net)>

 

 All,

 In the past I have run my 912UL without plugs and or wires not

 connected to fill gas lines and bring up oil press. didn't know

 it was a no no.

 If I have caused a problem what would the symptoms be?

 

 --------

 Vic

 912ul Xtra

 Maine

 Too old to cut the mustard but not the cheese.

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=340279#340279

 

 

 

 

 

 

 

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 http://forums.matronics.com

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 le, List Admin.

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-- 

Zulu Delta

Mk IIIC

Thanks, Homer GBYM

It isn't necessary to have relatives in Kansas City in order to be unhappy.

   - Groucho Marx



 

  [quote][b]

_________________
The smallest miracle right in front of you is enough to make you happy....

cscsail(at)gmavt.net
Guest

Posted: Wed May 18, 2011 8:54 am Post subject: Mag Ground

That's interesting, so is the diode suppose to  protect the circuitry? If so it doesn't seem well thought  out. 

 Gordon  

 [quote]   ---

rickofudall

Joined: 19 Sep 2009
Posts: 1392
Location: Udall, KS, USA

Posted: Wed May 18, 2011 3:30 pm Post subject: Mag Ground

Gordon, No it's just the part of the module that gets damaged if it attempts to fire an ungrounded spark plug.



Rick



On Wed, May 18, 2011 at 11:51 AM, Gordon <cscsail(at)gmavt.net (cscsail(at)gmavt.net)> wrote:

 [quote]       That's interesting, so is the diode suppose to  protect the circuitry? If so it doesn't seem well thought  out. 

 Gordon  

 [quote]   ---

_________________
The smallest miracle right in front of you is enough to make you happy....

s.clive.richards(at)homec
Guest

Posted: Thu May 19, 2011 2:41 am Post subject: Mag Ground

Vic

                 I read someware this is OK provided the mags are grounded to prevent plugs  firing and you have a seperate start button, as it is the much high voltage  generated if a plug cannot fire which causes the damage and is the reason not to  use a standard mag selector switch such as in a Cesna .

 Clive 

 [quote]    

   From:    Richard    Girard (aslsa.rng(at)gmail.com) 

   To: rotaxengines-list(at)matronics.com (rotaxengines-list(at)matronics.com)    

   Sent: Thursday, May 19, 2011 12:27    AM

   Subject: Re: Mag    Ground

   



Gordon, No it's just the part of the module that gets damaged    if it attempts to fire an ungrounded spark plug.   



   Rick



   On Wed, May 18, 2011 at 11:51 AM, Gordon <cscsail(at)gmavt.net (cscsail(at)gmavt.net)> wrote:

   [quote]          That's interesting, so is the diode suppose to      protect the circuitry? If so it doesn't seem well thought      out. 

     Gordon  

     [quote]              ---

Vic Peters

Joined: 30 Oct 2009
Posts: 54
Location: Millinocket, Maine

Posted: Sat May 21, 2011 5:34 am Post subject: Mag Ground

Good to hear thanks 

   [quote][b]

_________________
Vic
912ul Xtra
Maine
Too old to cut the mustard but not the cheese.

Vic Peters

Joined: 30 Oct 2009
Posts: 54
Location: Millinocket, Maine

Posted: Sat May 21, 2011 5:35 am Post subject: Mag Ground

I just finished putting in a separate mag switch so  I could turn

 it over with mags off.

   [quote][b]

_________________
Vic
912ul Xtra
Maine
Too old to cut the mustard but not the cheese.

VIXEN

Joined: 23 Nov 2009
Posts: 35

Posted: Sat May 21, 2011 5:52 am Post subject: Mag Ground

Hello Guys



My Model 5 Vixen has separate mag (module) switches. My normal start-up procedure is to leave the switches OFF and crank the starter a few seconds to bring up full oil pressure. I then turn on the switches and start-up. My thinking here is that the engine will have lubrication before it runs at 2000 or so RPM. I have been doing that now for about 100 hours. This should not affect the diodes as long as the modules are OFF, right. Anyone care to comment on this

 

Don Hudgeon

KF5 C-FOXK        912UL   IVO IFA.



On Sat, May 21, 2011 at 6:33 AM, Vic <vicsv(at)myfairpoint.net (vicsv(at)myfairpoint.net)> wrote:

 [quote]       I just finished putting in a separate mag switch so  I could turn

 it over with mags off.

    	  Quote: 	
		  



ist" target="_blank">http://www.matronics.com/Navigator?RotaxEngines-List

tp://forums.matronics.com

_blank">http://www.matronics.com/contribution



	




[b]

VIXEN

Joined: 23 Nov 2009
Posts: 35

Posted: Sat May 21, 2011 6:04 am Post subject: Mag Ground

On Sat, May 21, 2011 at 6:49 AM, Don Hudgeon <don(at)hudgeon.com (don(at)hudgeon.com)> wrote:

[quote] Hello Guys



My Model 5 Vixen has separate mag (module) switches. My normal start-up procedure is to leave the switches OFF and crank the starter a few seconds to bring up full oil pressure. I then turn on the switches and start-up. My thinking here is that the engine will have lubrication before it runs at 2000 or so RPM. I have been doing that now for about 100 hours. This should not affect the diodes as long as the modules are OFF, right. Anyone care to comment on this

  

Don Hudgeon

KF5 C-FOXK        912UL   IVO IFA.

On Sat, May 21, 2011 at 6:33 AM, Vic <vicsv(at)myfairpoint.net (vicsv(at)myfairpoint.net)> wrote:

   	  Quote: 	
		         I just finished putting in a separate mag switch so  I could turn

 it over with mags off.

    	  Quote: 	
		  



ist" target="_blank">http://www.matronics.com/Navigator?RotaxEngines-List

tp://forums.matronics.com

_blank">http://www.matronics.com/contribution



	




	




 



[b]

rickofudall

Joined: 19 Sep 2009
Posts: 1392
Location: Udall, KS, USA

Posted: Sat May 21, 2011 6:55 am Post subject: Mag Ground

Don, the key is that the ignition is grounded, so no problem with your startup method. Here is where the real problem comes. Trying to diagnose an engine that won't start, pulling a plug and trying to ground it on the head to see if there's a spark. This may have worked for your Grandpa's 52 Chevy six, but it's a real bad idea for any Rotax with the electronic ignition. First, the spark is so weak that you probably won't be able to see it. Second, if you don't get a good ground, that little diode has to take all that energy instead. That's where you really put the ignition module at risk.

 



Rick Girard



On Sat, May 21, 2011 at 9:02 AM, Don Hudgeon <don(at)hudgeon.com (don(at)hudgeon.com)> wrote:

 	  Quote: 	
		   



On Sat, May 21, 2011 at 6:49 AM, Don Hudgeon <don(at)hudgeon.com (don(at)hudgeon.com)> wrote:

 	  Quote: 	
		    Hello Guys



My Model 5 Vixen has separate mag (module) switches. My normal start-up procedure is to leave the switches OFF and crank the starter a few seconds to bring up full oil pressure. I then turn on the switches and start-up. My thinking here is that the engine will have lubrication before it runs at 2000 or so RPM. I have been doing that now for about 100 hours. This should not affect the diodes as long as the modules are OFF, right. Anyone care to comment on this

   

Don Hudgeon

KF5 C-FOXK        912UL   IVO IFA.

On Sat, May 21, 2011 at 6:33 AM, Vic <vicsv(at)myfairpoint.net (vicsv(at)myfairpoint.net)> wrote:

    	  Quote: 	
		         I just finished putting in a separate mag switch so  I could turn

 it over with mags off.

    	  Quote: 	
		  



ist" target="_blank">http://www.matronics.com/Navigator?RotaxEngines-List

tp://forums.matronics.com

_blank">http://www.matronics.com/contribution



	




	




 







ist" target="_blank">http://www.matronics.com/Navigator?RotaxEngines-List

tp://forums.matronics.com

_blank">http://www.matronics.com/contribution



	
	


-- 

Zulu Delta

Mk IIIC

Thanks, Homer GBYM

It isn't necessary to have relatives in Kansas City in order to be unhappy.

   - Groucho Marx



 

  [quote][b]

_________________
The smallest miracle right in front of you is enough to make you happy....

mortweaver(at)sbcglobal.n
Guest

Posted: Sat May 21, 2011 9:28 am Post subject: Mag Ground

I would suggest that most normal engine wear occurs in the short interval between engine start-up and point where oil pressure climbs to normal level.  Modern day lubricants flow much better than those available from decades past.  I am not concerned with engine start-ups whether winter or summer as I use a permanent Teflon resin engine coating that I have over 25 years experience with.  That experience involved destructive engine testing and included tracking engine wear progress with oil analysis.  I have a history of keeping my autos for several hundred thousand miles before retirement.  With the exception of 2 cycle engines I treat 4 cycle and diesel engines including my Rotax 912 with Slick 50 engine treatment.  I have never seen any engine additive endorsed by any engine manufacturer.  There is a  considerable amount of negative press on the Internet by so-called engine experts about Slick 50.  None of the opinions offered that I have seen indicated that my efforts to test the product were duplicated by any of them.  I can be reached by telephone (630-514-5696) should anyone wish to engage in further discussion of this product that I regard as engine insurance.

 Dave Weaver  N912GR



--- On Sat, 5/21/11, Don Hudgeon <don(at)hudgeon.com> wrote:



  	  Quote: 	
		  

From: Don Hudgeon <don(at)hudgeon.com>

Subject: Re: Mag Ground

To: rotaxengines-list(at)matronics.com

Date: Saturday, May 21, 2011, 8:49 AM



 Hello Guys



My Model 5 Vixen has separate mag (module) switches. My normal start-up procedure is to leave the switches OFF and crank the starter a few seconds to bring up full oil pressure. I then turn on the switches and start-up. My thinking here is that the engine will have lubrication before it runs at 2000 or so RPM. I have been doing that now for about 100 hours. This should not affect the diodes as long as the modules are OFF, right. Anyone care to comment on this



Don Hudgeon

KF5 C-FOXK        912UL   IVO IFA.



 On Sat, May 21, 2011 at 6:33 AM, Vic <vicsv(at)myfairpoint.net (vicsv(at)myfairpoint.net)> wrote:

  	  Quote: 	
		    I just finished putting in a separate mag switch so I could turn

 it over with mags off.

  	  Quote: 	
		  



ist" target="_blank">http://www.matronics.com/Navigator?RotaxEngines-List

tp://forums.matronics.com

_blank">http://www.matronics.com/contribution



	








ist" rel=nofollow target=_blank>http://www.matronics.com/Navigator?RotaxEngines-List

et=_blank>http://forums.matronics.com

llow target=_blank>http://www.matronics.com/contribution



	


	
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