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06-17-2015, 03:54 AM
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Join Date: Sep 2012
Location: Canton,NC
Posts: 190
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Quote:
Originally Posted by Raymo
Except now you won't want to rotate plugs from top to bottom for more even wear?
Fine wire costs 3x but are also supposed to last 3x longer.
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That seems like more reason to put the fine wires on the bottom. I can replace the top plugs 3 time before the bottoms need replacing ...and eliminate (virtually) all the fouling of the bottom plugs.
__________________
Dad of an Air Force C-17 flight instructor
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06-25-2015, 12:50 PM
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Join Date: Mar 2009
Location: Pasadena, California
Posts: 214
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Tempest UREM37BY
I was dealing with the same lead fouling problem in my RV6 running O-360-A4A. The builder/seller always run car gas so this fouling issue is new to the plane. The plane came with Champion plugs - 7 massive and 1 fine wire.
I first looked into fine wire plugs, and discovered a lot of Bonanza drivers were having their share of problems with fine wire. I am not sure if that is unique to Continental or maybe only for Champion fine wire plugs. In any case, I ruled out fine wire because the cost is just too high. I know you can run them longer, but I don't see the manufacturer guaranty the plugs for the life of engine TBO so if anything goes wrong it is on me.
My research then found Lycoming Service Letter L192B recommending 37BY plugs:
http://www.lycoming.com/Portals/0/te...%20Fouling.pdf
So I order 8 Tempest UREM37BY plugs from Chief for just under $200. I only had 3 flights so far with no indication of fouling plugs.
Just one data point. I hope it helps.
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06-25-2015, 01:07 PM
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Join Date: May 2014
Location: Savannah
Posts: 806
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The resistors will usually fail in a plug way before the electrode wears out. This is especially true of Champion plugs, or at least the old Champions before they supposedly changed the internal resistors. The Resistors in a fine wire plug will not last any longer than in a massive type plug. The fine wire plugs do not foul due to bridging as often as a massive plug due to the extra clearance between the center electrode insulator and the inside diameter of the housing, but they will still foul just the same due to over priming or poor technique and flooding on start up. The 37BYs do a good job of keeping the lead build up away from the electrodes.
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Mike Hammond
A&P IA PPL ASEL
RV-14A kit S/N 140170
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06-25-2015, 03:53 PM
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Join Date: Jan 2005
Posts: 117
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I have over 1,000 hours on the Tempest Wine Wire plugs in both top and bottom of my RV-10 and love them. I just pick out a few lead balls at annual time, but other then that they are clean with running 100LL.
Ray Doerr
RV-10 (N519RV)
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06-25-2015, 05:05 PM
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Join Date: Nov 2005
Location: Asheville, NC
Posts: 2,692
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Quote:
Originally Posted by Abbygirl1
I need to replace the plugs (Lyc O-320 D1A). ?
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Stop by the hangar, Jim. I have some used Champion massives that I dropped on the concrete for sale.
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Bill Pendergrass
ME/AE '82
RV-7A: Flying since April 15, 2012. 850 hrs
YIO-360-M1B, mags, CS, GRT EX and WS H1s & A/P, Navworx
Unpainted, polished....kinda'... Eyeballin' vinyl really hard.
Yeah. The boss got a Silhouette Cameo 4 Xmas 2019.
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04-11-2017, 02:31 PM
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Join Date: Oct 2008
Location: Utah
Posts: 8,151
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Quote:
Originally Posted by Mike H
....
The Resistors in a fine wire plug will not last any longer than in a massive type plug. The fine wire plugs do not foul due to bridging as often as a massive plug due to the extra clearance between the center electrode insulator and the inside diameter of the housing, but they will still foul just the same due to over priming or poor technique and flooding on start up.
....
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Good point. I am wondering if spark is stronger between massive electrodes vs fine wire.
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04-11-2017, 02:54 PM
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Join Date: Oct 2012
Location: Clearwater, FL KCLW
Posts: 1,281
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I have a low compression O320E3D that is supposed to be very prone to fouling. Have the Champion massive plugs. After 100 hours I have had zero lead fouling issues using the Lycoming recommended techniques:
Lean aggressively on the ground
Lean after reducing takeoff power and throughout cruise
Run engine at 1800 rpm for 15-20 seconds just prior to shut down
I just inspected my plugs and all looked excellent. Not saying it will work for everyone, but sure works for me so far.
Chris
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Chris Johnson
RV-9A - Done(ish) 4/5/16! Flying 4/7/16
Last edited by YellowJacket RV9 : 04-12-2017 at 02:51 PM.
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04-12-2017, 09:09 AM
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Join Date: Oct 2013
Location: Schaumburg, IL
Posts: 5,297
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Quote:
Originally Posted by RV6_flyer
I like the ___37BY spark plugs. They are the massive electrode plugs that have the tip and electrodes sticking out to reduce lead fooling.
Others swear by the fine wire. The fine wire are a LOT more money. I have had no issue with the massive electrode plugs so I stick with the less expensive option.
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Same experience here. 300 hours and never had fouling issues or found deposits on the plugs. I always run LOP in the air and never lean on the ground.
Larry
__________________
N64LR - RV-6A / IO-320, Flying as of 8/2015
N11LR - RV-10, Flying as of 12/2019
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04-12-2017, 09:15 AM
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Join Date: Oct 2013
Location: Schaumburg, IL
Posts: 5,297
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Quote:
Originally Posted by Vlad
Good point. I am wondering if spark is stronger between massive electrodes vs fine wire.
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A hotly debated topic. In my experience, a hotter spark will provide no improvement to performance under normal circumstances. It will, however, help to avoid misses and better maintain combustion timing in overly lean or overly rich mixtures.
Spark energy is dictated by the power of the coil setup, which is throttled by the sparkplug gap. electrode material will have no meaningfull effect on spark energy, though it does impact electode wear and longevity.
Larry
__________________
N64LR - RV-6A / IO-320, Flying as of 8/2015
N11LR - RV-10, Flying as of 12/2019
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04-12-2017, 10:07 AM
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Join Date: Feb 2010
Location: Gardnerville Nv.
Posts: 2,828
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Quote:
Originally Posted by YellowJacket RV9
I have a low compression O320E3D that is supposed to be very prone to fouling. Have the Champion massive plugs. After 100 hours I have had zero lead fouling issues using the Lycoming recommended techniques:
Lean aggressively on the ground
Lean after reducing takeoff power and throughout cruise
Run engine at 1800 rpm for 45 seconds just prior to shut down
I just inspected my plugs and all looked excellent. Not saying it will work for everyone, but sure works for me so far.
Chris
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Are you doing this in front of your hangar? don't think that would go too well where I'm at..... 
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7A Slider, EFII Angle 360, CS, SJ.
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