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06-01-2014, 08:57 AM
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Join Date: Sep 2007
Location: BC
Posts: 1,674
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Mags and plugs question
Is there any convention as to which mags fire which plugs? ie Does the left mag typically fire the upper or lower plugs? Both are P-mags in my case, O-360.
Bevan
__________________
RV7A Flying since 2015
O-360-A1F6 (parallel valve) 180HP
Dual P-mags
Precision F.I. with AP purge valve
Vinyl Wrapped Exterior
Grand Rapids EFIS
Located in western Canada
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06-01-2014, 09:03 AM
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Senior Curmudgeon
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Join Date: Sep 2005
Location: Dayton Airpark, NV A34
Posts: 15,408
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What I have usually seen is one mag fires top plugs on one side, bottom on the other side.
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Mike Starkey
VAF 909
Rv-10, N210LM.
Flying as of 12/4/2010 
Phase 1 done, 2/4/2011
Sold after 240+ wonderful hours of flight.
"Flying the airplane is more important than radioing your plight to a person on the ground incapable of understanding or doing anything about it."
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06-01-2014, 09:39 AM
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Join Date: Mar 2008
Location: Ramona, CA
Posts: 2,367
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Google is your friend. I found this with a quick search.
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06-01-2014, 02:13 PM
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Join Date: Sep 2007
Location: BC
Posts: 1,674
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Hadn't thought to ask my friend Mr Google. Thanks!
Bevan
__________________
RV7A Flying since 2015
O-360-A1F6 (parallel valve) 180HP
Dual P-mags
Precision F.I. with AP purge valve
Vinyl Wrapped Exterior
Grand Rapids EFIS
Located in western Canada
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06-02-2014, 06:36 AM
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Join Date: Aug 2010
Location: Wichita, KS
Posts: 1,957
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So what is the purpose of running the tops on one side and the bottoms on the other, with each mag? Why not left mag for bottom plugs, right mag for tops, or vice versa?
Is there a safety or mechanical advantage to splitting them?
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Kurt W.
RV9A
FLYING!!!
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06-02-2014, 11:51 AM
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Join Date: Sep 2007
Location: BC
Posts: 1,674
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Just a guess here that the conventional arrangement eliminates differences in RPM drop when doing mag checks. I.e. each mag is firing some tops and some bottoms. Just a guess.
Bevan
__________________
RV7A Flying since 2015
O-360-A1F6 (parallel valve) 180HP
Dual P-mags
Precision F.I. with AP purge valve
Vinyl Wrapped Exterior
Grand Rapids EFIS
Located in western Canada
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06-02-2014, 12:33 PM
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Join Date: Mar 2008
Location: Seattle
Posts: 1,412
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The idea is the shortest plug leads go to the bottom plugs.
Right mag to right bottom, left mag to left bottom.
Long leads mean weaker spark. Bottom plugs foul the easiest, so should have the hottest spark available, so, the shortest plug wire.
__________________
Scott Emery
http://gallery.eaa326.org/v/members/semery/
EAA 668340, chapter 326 & IAC chapter 67
RV-8 N89SE first flight 12/26/2013
Yak55M, and the wife has an RV-4
There is nothing-absolute nothing-half so much worth doing as simply messing around with Aeroplanes
(with apologies to Ratty)
2019
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06-02-2014, 04:23 PM
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Join Date: Sep 2007
Location: BC
Posts: 1,674
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Good to know. Each P-mag came a package of 4 plug wires. One long, two medium and one short. I assume that means each one for the appropriate distance to comfortably get to the respective plug.
Bevan
__________________
RV7A Flying since 2015
O-360-A1F6 (parallel valve) 180HP
Dual P-mags
Precision F.I. with AP purge valve
Vinyl Wrapped Exterior
Grand Rapids EFIS
Located in western Canada
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06-03-2014, 07:13 AM
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Join Date: Aug 2010
Location: Wichita, KS
Posts: 1,957
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Quote:
Originally Posted by SHIPCHIEF
The idea is the shortest plug leads go to the bottom plugs.
Right mag to right bottom, left mag to left bottom.
Long leads mean weaker spark. Bottom plugs foul the easiest, so should have the hottest spark available, so, the shortest plug wire.
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Is the difference in spark "strength" really degraded significantly over less than 2 additional feet of plug wire? It seems the Lycoming graphic in one of the above posts actually has the longer leads from both mags going to the bottom plugs. On the "optional" arrangement the shortest leads go to the bottom.
I'm just trying to figure out if there's any sort of safety or operational reason not to fire all the bottoms with one mag and all the tops with the other. I know that a lot of folks running mixed ignitions (one mag, one electronic ignition) are doing just that. Is this a bad idea, and why?
__________________
Kurt W.
RV9A
FLYING!!!
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06-03-2014, 10:13 AM
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Join Date: Jan 2005
Location: Louisville, Ga
Posts: 7,840
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I have one mag and a Lightspeed plasma ignition system. The mag fires all six lower aviation type plugs and the Lightspeed fires all the top automotive type fine wire plugs.
Best,
__________________
Pierre Smith
RV-10, 510 TT
RV6A (Sojourner) 180 HP, Catto 3 Bl (502Hrs), gone...and already missed
Air Tractor AT 502B PT 6-15 Sold
Air Tractor 402 PT-6-20 Sold
EAA Flight Advisor/CFI/Tech Counselor
Louisville, Ga
It's never skill or craftsmanship that completes airplanes, it's the will to do so,
Patrick Kenny, EAA 275132
Dues gladly paid!
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