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02-18-2016, 09:13 AM
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Join Date: Aug 2015
Location: Spokane, WA
Posts: 27
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NGK Spark Plug PIREP
On takeoff in my RV-6 I experienced rough power at full throttle. Simultaneously, I noted a significant EGT drop on #3 cylinder to 600-700 deg range versus 1300-1400 deg on the other three cylinders. Rough power ceased with reduced throttle. Conferred with my AP who suggested a bad sparkplug or two. I swapped out all NGK BR8ES plugs for same type new plugs. No problems in five hours of flight time since change. My RV has P-MAGS on an IO-360EXP. Replaced plugs had 80 hours of use. Replaced plugs all appeared to be in good shape.
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02-18-2016, 09:16 AM
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Join Date: Dec 2009
Location: Boulder, CO
Posts: 4,428
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How much time did the old plugs have on them?
Dave
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02-18-2016, 09:21 AM
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Join Date: Apr 2012
Location: Tampa (BKV)
Posts: 926
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Spark plugs are fragile creatures. If the box they were in was dropped or worse yet the plug itself was ever dropped....they cause problems down the road. Once installed, they are relatively safe but accidentally drop a ratchet on one...and you're looking for trouble. You may have had one with an issue. I have hundreds of hours on them in my plane and thousands of track miles on NGK BR8ES's in my race car. They are great plugs....but like all others, treat them gently.
IMHO
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02-18-2016, 09:35 AM
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Join Date: Dec 2007
Location: Dogwood Airpark (VA42)
Posts: 2,587
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I suspect this is not a typical issue. I have 700+ on NGK BR8ES plugs (dual p-Mags) and never had a problem. They get replaced every other year - mainly because they are so cheap to replace instead of clean.
Carl
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02-18-2016, 09:55 AM
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Join Date: Mar 2008
Location: Ramona, CA
Posts: 2,367
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Which part number? There are two types. One version has screw on posts and their is another one with solid posts (NGK BR8ES part number #3961). You don't want to use the screw on versions, since they can loosen and cause ignition problems.
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02-18-2016, 10:43 AM
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Join Date: Jan 2005
Location: SC
Posts: 12,887
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Quote:
Originally Posted by Carl Froehlich
I suspect this is not a typical issue. I have 700+ on NGK BR8ES plugs (dual p-Mags) and never had a problem. They get replaced every other year - mainly because they are so cheap to replace instead of clean.
Carl
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You will want to replace them every 120 hours or so. Using the EICommander I have noticed at around the mark they start to deteriorate. It is nothing you will feel but the EIC definitely notices it.
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Bill R.
RV-9 (Yes, it's a dragon tail)
O-360 w/ dual P-mags
Build the plane you want, not the plane others want you to build!
SC86 - Easley, SC
www.repucci.com/bill/baf.html
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02-18-2016, 10:52 AM
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Join Date: Jan 2005
Location: TX32
Posts: 1,890
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Amen!
Quote:
Originally Posted by N941WR
You will want to replace them every 120 hours or so. Using the EICommander I have noticed at around the mark they start to deteriorate. It is nothing you will feel but the EIC definitely notices it.
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Pete,
I had no issues with the NGK's although I changed them every oil change. (50hrs) My favorite plugs over the years are the Autolite 386, Denso L-14U and lastly the NGK. The best of them being the Denso L-14U IMHO.
Change them often, they're cheap insurance.
V/R
Smokey |
02-18-2016, 04:45 PM
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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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L-14U's are non-resistor and I find that the ignition noise can be heard quite loudly in the radio. The 386's seem to work well with Electroair and don't require adapters.
Vic
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 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
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Author "Pre-Buy Guide for Amateur-Built Aircraft"
www.Baselegaviation.com
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02-19-2016, 08:51 AM
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Join Date: Aug 2015
Location: Spokane, WA
Posts: 27
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NGK Spark Plug PIREP
Good input from all, thanks. My plugs had 80 hours of use and had solid posts. Coincidentally, Sport Aviation has an article on auto plugs in this month's issue. It's Rotax oriented but probably good food for thought.
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02-19-2016, 10:04 PM
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Join Date: Mar 2008
Location: Seattle
Posts: 1,412
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Resistor Caps
https://www.ngksparkplugs.com/produc.../resistor-caps
Try resistor caps on non-resistor spark plugs if you experience ignition noise on your radios.
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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
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2019
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