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  #21  
Old 03-20-2018, 04:51 AM
Tom Martin Tom Martin is offline
 
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The easiest thing would be to go with two mags. Pretty close to 100% of the cert. aircraft are using them. Next, after 200 to 300 hours, by which time you will really know the airplane, swap out one mag for one of the many alternatives.
Fly for another 150 hours or so and either rebuild the mag if you are happy with how things work, or add the second electronic ignition.
If you do it this way you will know if there are improvements that are important to you and your airplane.
I fly with one electronic ignition and one mag. I like it but that does not mean that you will.
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  #22  
Old 03-20-2018, 06:27 AM
pa38112 pa38112 is offline
 
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Location: Clarksboro, NJ
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Two Pmags for this reason: The Pmags change the timing based on RPM/MP. If you did one standard mag it would always be firing off time from the Pmag, either doing nothing or negating the timing change of the Pmag. The purpose of two plugs per cylinder is to have a larger, even flame front across the large bore area. You loose that if you are firing from only one side.
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  #23  
Old 03-20-2018, 08:49 AM
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Av8torTom Av8torTom is offline
 
Join Date: Nov 2009
Location: Yardley, PA
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Thanks everyone. The decision is to go with two P-mags.
I?ll post a pic shortly
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  #24  
Old 03-20-2018, 03:29 PM
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Av8torTom Av8torTom is offline
 
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Location: Yardley, PA
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Default Dual P-Mags

First one installed


Both in place


Me and my build instructor Darrell


Thanks everyone for all the helpful advice. This forum rocks!
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RV-9A (empennage completed, both wings completed, fuselage and finish kit completed, engine hung, working on panel and wiring)
N677AT reserved
Superior XP O-320, 160HP
Picture log: http://s271.photobucket.com/albums/j...8tor215/RV-9A/

Last edited by Av8torTom : 03-21-2018 at 07:16 AM.
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  #25  
Old 03-20-2018, 04:36 PM
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az_gila az_gila is offline
 
Join Date: Jan 2005
Location: 57AZ - NW Tucson area
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Quote:
Originally Posted by pa38112 View Post
Two Pmags for this reason: The Pmags change the timing based on RPM/MP. If you did one standard mag it would always be firing off time from the Pmag, either doing nothing or negating the timing change of the Pmag. The purpose of two plugs per cylinder is to have a larger, even flame front across the large bore area. You loose that if you are firing from only one side.
And I though the two plugs per cylinder in traditional aircraft engines was for reliability since there are two magnetos usually involved.

Could two magnetos even fire a single plug easily?
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