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Standard mags: Lycoming

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John M Tipton

Joined: 07 Aug 2018
Posts: 45
Location: Devon - England

Posted: Mon Jul 27, 2020 5:25 am Post subject: Standard mags: Lycoming

Hi Guys



With 'standard' mags as supplied by Lycoming, and an RV9a with ACS Key switch WITHOUT starter position and using 'push switch' to operate starter, should the engine be started on LEFT MAG ONLY.



John



PS: Aircraft Spruce photo: copyright acknowledged

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donjohnston

Joined: 13 Dec 2009
Posts: 231

Posted: Mon Jul 27, 2020 6:18 am Post subject: Re: Standard mags: Lycoming

You want to start on the mag with the impulse coupling.  On most engines, that would be the left mag.  But you should check to make sure.

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alec(at)alecmyers.com
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Posted: Mon Jul 27, 2020 2:34 pm Post subject: Standard mags: Lycoming

Depends on what the mags are. If they both have impulse couplings you can start on both, I think.



Sent from my iPhone



 	  Quote: 	
		   On Jul 27, 2020, at 9:26 AM, John M Tipton <johntiptonuk(at)hotmail.com> wrote:

 

 

 

 Hi Guys

 

 With 'standard' mags as supplied by Lycoming, and an RV9a with ACS Key switch WITHOUT starter position and using 'push switch' to operate starter, should the engine be started on LEFT MAG ONLY.

 

 John

 

 PS: Aircraft Spruce photo: copyright acknowledged

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=497432#497432

 

 

 

 

 Attachments: 

 

 http://forums.matronics.com//files/electrical_ignition_switches_acs_keyed_ignition_switches_1_108.jpg

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email(at)jaredyates.com
Guest

Posted: Mon Jul 27, 2020 2:49 pm Post subject: Standard mags: Lycoming

The common configuration is to have the impulse coupling on the left, which means left on and right off for starting. 

  On July 27, 2020 09:31:49 "John M Tipton" <johntiptonuk(at)hotmail.com> wrote:

 



  	  Quote: 	
		   --> AeroElectric-List message posted by: "John M Tipton" <johntiptonuk(at)hotmail.com>

 



 Hi Guys

 



 With 'standard' mags as supplied by Lycoming, and an RV9a with ACS Key switch WITHOUT starter position and using 'push switch' to operate starter, should the engine be started on LEFT MAG ONLY.

 



 John

 



 PS: Aircraft Spruce photo: copyright acknowledged

 



 



 



 



 Read this topic online here:

 



 http://forums.matronics.com/viewtopic.php?p=497432#497432

 



 



 



 



 Attachments: 

 



 http://forums.matronics.com//files/electrical_ignition_switches_acs_keyed_ignition_switches_1_108.jpg

 



 



 



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ceengland7(at)gmail.com
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Posted: Mon Jul 27, 2020 4:26 pm Post subject: Standard mags: Lycoming

On Mon, Jul 27, 2020 at 8:30 AM John M Tipton <johntiptonuk(at)hotmail.com (johntiptonuk(at)hotmail.com)> wrote:



 	  Quote: 	
		  --> AeroElectric-List message posted by: "John M Tipton" <johntiptonuk(at)hotmail.com (johntiptonuk(at)hotmail.com)>

 

 Hi Guys

 

 With 'standard' mags as supplied by Lycoming, and an RV9a with ACS Key switch WITHOUT starter position and using 'push switch' to operate starter, should the engine be started on LEFT MAG ONLY.

 

 John



	
The engine should be started with the impulse coupled mag 'on' (ungrounded P lead), and the other P lead grounded.  What you describe is how the switch *should* operate, but it's easy to verify operation for yourself. Without the P leads connected to the switch, Measure resistance from each P lead terminal to the ground terminal, 1st with the switch 'off', then in 'L', then in 'R'. Both P lead terminals should show dead short to the ground terminal with the switch 'Off'. The 'L' terminal should  show an open circuit (infinitely high resistance) and the 'R' terminal should show a short to ground with the switch in 'L', and the reverse in 'R'. With the switch in 'Both', both terminals should show open to the ground terminal. (Don't forget that if you're touching the terminals with your fingers, your body will conduct slightly, so depending on the meter, you might see some high but not infinite resistance when the switch is open.)

The left mag is *typically* the impulse mag, but it's pretty easy to check. The impulse mag has what appears to be a spacer that's about an inch thick between the body of the mag and the engine. So the 'taller' mag is the impulse mag.

Charlie



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john(at)tipton.me.uk
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Posted: Tue Jul 28, 2020 12:44 am Post subject: Standard mags: Lycoming

I presume my next question is: does a Lycoming that comes via Vans for an RV come with one or two ‘Impulse Coupled’ mags.



John

Sent from my iPad



     ----x--O--x----

 	  Quote: 	
		  On 28 Jul 2020, at 1:38 am, Charlie England <ceengland7(at)gmail.com> wrote:







On Mon, Jul 27, 2020 at 8:30 AM John M Tipton <johntiptonuk(at)hotmail.com (johntiptonuk(at)hotmail.com)> wrote:



 	  Quote: 	
		  --> AeroElectric-List message posted by: "John M Tipton" <johntiptonuk(at)hotmail.com (johntiptonuk(at)hotmail.com)>

 

 Hi Guys

 

 With 'standard' mags as supplied by Lycoming, and an RV9a with ACS Key switch WITHOUT starter position and using 'push switch' to operate starter, should the engine be started on LEFT MAG ONLY.

 

 John



	
The engine should be started with the impulse coupled mag 'on' (ungrounded P lead), and the other P lead grounded.  What you describe is how the switch *should* operate, but it's easy to verify operation for yourself. Without the P leads connected to the switch, Measure resistance from each P lead terminal to the ground terminal, 1st with the switch 'off', then in 'L', then in 'R'. Both P lead terminals should show dead short to the ground terminal with the switch 'Off'. The 'L' terminal should  show an open circuit (infinitely high resistance) and the 'R' terminal should show a short to ground with the switch in 'L', and the reverse in 'R'. With the switch in 'Both', both terminals should show open to the ground terminal. (Don't forget that if you're touching the terminals with your fingers, your body will conduct slightly, so depending on the meter, you might see some high but not infinite resistance when the switch is open.)

The left mag is *typically* the impulse mag, but it's pretty easy to check. The impulse mag has what appears to be a spacer that's about an inch thick between the body of the mag and the engine. So the 'taller' mag is the impulse mag.

Charlie



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