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run-on engine?

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pchapman(at)ionsys.com
Guest

Posted: Wed Sep 20, 2006 2:45 pm Post subject: run-on engine?

Hi,

Any ideas on solutions for a run-on engine issue?



This is for a 912 engine, usually running on 91 Mogas,  that tended 

to run some seconds after shutdown, during operations this summer. 

The run-on is intermittent so it really shakes the engine and is 

clearly not a good thing.



I've only seen a little bit in the archives about the issue.

Topics that had come up, for different engine types:

- too hot

- combustion deposits (hot spots)

- poor fuel quality, or old fuel

- timing too advanced

- carbs need cleaning, eg, dirt under needle.



Ways to deal with it were suggested:

- reduce idle speed

- idle longer before shutoff to cool engine

- use choke on shutdown           (too little air for it to run)

- ignition off, throttle wide open   (too much air for it to run)

Peter Chapman

Toronto, ON           601 HDS  /  912  /  C-GZDC

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gfmjr_20(at)HOTMAIL.COM
Guest

Posted: Wed Sep 20, 2006 3:19 pm Post subject: run-on engine?

Peter--

  One other suggestion in the archieves was to turn off one mag before 

shutting down to reduce the shaking.



George May

601XL 912s



 	  Quote: 	
		  From: Peter Chapman <pchapman(at)ionsys.com>

Reply-To: zenith-list(at)matronics.com

To: zenith-list(at)matronics.com

Subject: run-on engine?

Date: Wed, 20 Sep 2006 18:30:08 -0400






Hi,

Any ideas on solutions for a run-on engine issue?



This is for a 912 engine, usually running on 91 Mogas,  that tended to run 

some seconds after shutdown, during operations this summer. The run-on is 

intermittent so it really shakes the engine and is clearly not a good 

thing.



I've only seen a little bit in the archives about the issue.

Topics that had come up, for different engine types:

- too hot

- combustion deposits (hot spots)

- poor fuel quality, or old fuel

- timing too advanced

- carbs need cleaning, eg, dirt under needle.



Ways to deal with it were suggested:

- reduce idle speed

- idle longer before shutoff to cool engine

- use choke on shutdown           (too little air for it to run)

- ignition off, throttle wide open   (too much air for it to run)

Peter Chapman

Toronto, ON           601 HDS  /  912  /  C-GZDC


	


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jpollard(at)ciaccess.com
Guest

Posted: Wed Sep 20, 2006 6:17 pm Post subject: run-on engine?

Hi Peter



Could you shut the fuel off and stall the engine until you find

out what the runon is caused by. There may be less shaking

of the engine using this method.



A bad helicoil job to fix a messed up spark plug thread can cause this.



Also dirty spark plugs.



Jim Pollard

Merlin Ont

At 06:30 PM 9/20/2006, you wrote:

 	  Quote: 	
		  



Hi,

Any ideas on solutions for a run-on engine issue?

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ggower_99(at)yahoo.com
Guest

Posted: Wed Sep 20, 2006 10:33 pm Post subject: run-on engine?

Hello Peter,

   

  Here is a first hand comment, has worked for all the 912 ans 912S engines in our Club for years, even before the "cluch" in the reduction.  

  Side note: Do you refer as run-on what is also known as "Dieseling"  (engine continues running with the switch off)?

   

  We are located at 5,000 ft ASL and hot in summer.



  We have the engines (912 and 912S) set to idle at 2,000 rpm.  to shut down the engine, we use this simple rutine:

   

  Once the engine is in idle ready to shut down, we rev it up to 3,500 and at the same time we "off" the key and pull the gas to idle.  The engine normal shaking is close to cero.  Is important to practice the timing. Soon will be a natural procedure. 

  Keeping the engine tune up (timing and good plugs (at) 25  or most 50 hrs), will not "Diesel" when shut down.

    

  Hope this helps.

  Saludos

  Gary Gower

  Flying from Chapala, Mexico.

  701 912S.

Peter Chapman <pchapman(at)ionsys.com> wrote:

   	  Quote: 	
		  --> Zenith-List message posted by: Peter Chapman 



Hi,

Any ideas on solutions for a run-on engine issue?



This is for a 912 engine, usually running on 91 Mogas, that tended 

to run some seconds after shutdown, during operations this summer. 

The run-on is intermittent so it really shakes the engine and is 

clearly not a good thing.



I've only seen a little bit in the archives about the issue.

Topics that had come up, for different engine types:

- too hot

- combustion deposits (hot spots)

- poor fuel quality, or old fuel

- timing too advanced

- carbs need cleaning, eg, dirt under  needle.



Ways to deal with it were suggested:

- reduce idle speed

- idle longer before shutoff to cool engine

- use choke on shutdown (too little air for it to run)

- ignition off, throttle wide open (too much air for it to run)

Peter Chapman

Toronto, ON 601 HDS / 912 / C-GZDC 

	


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