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02-20-2016, 03:09 PM
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Join Date: Jul 2009
Location: Mojave
Posts: 4,642
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You DO NOT want to run non resistor plugs with Pmags. Ignition noise would be the least of your problems. As warned on the NGK site many electronic ignitions are vulnerable to RF interference thrown off by non resistor plugs and It has been my experience that Pmags are among them. The only issues Ive ever had with Pmags were self induced due to non risistor plugs.
To the OP: did you ohm your plugs before installation and after the event? I ohm and gap all my new plugs and have yet to see any deviation in many sets of NGK plugs.
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WARNING! Incorrect design and/or fabrication of aircraft and/or components may result in injury or death. Information presented in this post is based on my own experience - Reader has sole responsibility for determining accuracy or suitability for use.
Michael Robinson
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Harmon Rocket II -SDS EFI
RV-8 - SDS CPI
1940 Taylorcraft BL-65
1984 L39C
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02-20-2016, 03:45 PM
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Join Date: Mar 2005
Location: Calgary, Canada
Posts: 5,745
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Quote:
Originally Posted by Toobuilder
You DO NOT want to run non resistor plugs with Pmags. Ignition noise would be the least of your problems. As warned on the NGK site many electronic ignitions are vulnerable to RF interference thrown off by non resistor plugs and It has been my experience that Pmags are among them. The only issues Ive ever had with Pmags were self induced due to non risistor plugs.
To the OP: did you ohm your plugs before installation and after the event? I ohm and gap all my new plugs and have yet to see any deviation in many sets of NGK plugs.
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I'd add another vote to this. Use resistor plugs (solid caps) and proper suppression wires on all EIs. Any source of radio noise or weird EI problems I've seen in the last 20 years have been to do with bad wires, non-suppression wires or non-resistor plugs. You would not believe the bad things these can do on the bench. I wouldn't want them to happen in the air...
Never had a bad NGK plug yet- 40 years of using them personally and in every engine I've built and tuned for customers in that time professionally- thousands of plugs.
We do know of a bad batch last year so it can happen, but is a very remote possibility. |
02-20-2016, 05:29 PM
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Join Date: Feb 2008
Location: valencia, ca
Posts: 206
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Can those NGK plugs be used if you have dual mags
In my RV6A with a Lyc O360 A1A increased to 200HP by Performance Aero Engines, I have always used Champion plugs which I was due to replace at the next condition inspection. They go for about $26 each. Never had any problems with them.
But I see the NGK's are a couple bucks each.
Any problem using them on engine with mags, not EI?
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Paid for 2020 and well worth it!
Best investment I make all year....
US Army 1st Cavalry Division OH-58 AO
LAPD helicopter pilot, retired
RV6A sold
RV12 (non-builder)
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02-20-2016, 08:08 PM
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Join Date: Oct 2012
Location: New Ulm, Minnesota
Posts: 283
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NGK Spark plugs
I use NGK fine wire plugs and they out perform the standard plugs by a long ways.
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Robin Mckee
New Ulm, MN 56073
RV3b N219BB
420 hours and counting 
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02-21-2016, 06:32 PM
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Join Date: Jun 2005
Posts: 846
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Dabney
The answer is yes check my older post to see how I changed to NGK on mags.
BOB
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02-23-2016, 12:20 PM
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Join Date: May 2012
Location: Ga
Posts: 662
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Opps
Saw this from Ross and Vic AFTER I ordered the Denso's. What wuz i thinkin??
Guess I could put them in the GO bag for emergency use only.....
Quote:
Originally Posted by rv6ejguy
I'd add another vote to this. Use resistor plugs (solid caps) and proper suppression wires on all EIs. Any source of radio noise or weird EI problems I've seen in the last 20 years have been to do with bad wires, non-suppression wires or non-resistor plugs. You would not believe the bad things these can do on the bench. I wouldn't want them to happen in the air...
Never had a bad NGK plug yet- 40 years of using them personally and in every engine I've built and tuned for customers in that time professionally- thousands of plugs.
We do know of a bad batch last year so it can happen, but is a very remote possibility.
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Craig
RV-3 Sold
RV-4 Sold
RV-6a Sold
RV-9 IO-360 CS, Built and Flying
Aerostar 600A, Family Hotrod
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02-23-2016, 12:52 PM
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Join Date: Mar 2005
Location: Calgary, Canada
Posts: 5,745
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Quote:
Originally Posted by grubbat
Saw this from Ross and Vic AFTER I ordered the Denso's. What wuz i thinkin??
Guess I could put them in the GO bag for emergency use only.....
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Denso makes fine plugs too- as long as they are resistor type in this case. |
02-23-2016, 09:46 PM
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Join Date: Feb 2005
Posts: 592
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I've noticed that the Autolite 386 plugs seem to have a short reach but have not measured them....is that an problem?
PS being used on an IO-360-?? ECI engine.
Glenn
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RV-4 Sold
N654RV @ MLJ
RV-7 Coming Soon
N987RV Reserved
2015 Donation Gladly Paid
"Maintain Thy Airspeed, Lest the Earth Arise and Smite Thee"
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02-24-2016, 06:08 AM
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Super Moderator
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Join Date: May 2005
Location: Locust Grove, GA
Posts: 2,624
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I'm using them in the IO-540 with Electro air ignition. Seem to work OK.
Vic
__________________
 Vic Syracuse
Built RV-4, RV-6, 2-RV-10's, RV-7A, RV-8, Prescott Pusher, Kitfox Model II, Kitfox Speedster, Kitfox 7 Super Sport, Just Superstol, DAR, A&P/IA, EAA Tech Counselor/Flight Advisor, CFII-ASMEL/ASES
Kitplanes "Unairworthy" monthly feature
EAA Sport Aviation "Checkpoints" column
EAA Homebuilt Council Chair/member EAA BOD
Author "Pre-Buy Guide for Amateur-Built Aircraft"
www.Baselegaviation.com
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