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03-11-2011, 03:35 PM
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Join Date: Dec 2010
Location: Greeley, Colorado
Posts: 199
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Fine Wire Plugs
I love 'em in the two stroke but the Iridiums for the Lyc are in the 80 dollar range. Those selling them say how great they are. Does anybody have an unbiased opinion on these plugs?
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John D. Artz, EAA 71811, 100+ Young Eagle flts
Adopted Dave's 6A
MXL Ultralight, only bleeding after 3 landings
Scorpion Two Helicopter, big mistake
PA-28 and 210E Centurion
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03-11-2011, 03:58 PM
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Join Date: Jan 2007
Location: Stuart, FL /Hartford, CT/Virgin Gorda,BVI
Posts: 3,122
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i have used both...................
the regular massive electrode type were replaced every 5oo hrs in my first engine. my second engine has 800 hrs on the fine wire and show no wear.they will easily run tbo with no regapping, just picking out some lead. overall i am very happy with the fine wire plugs.
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TURBO YES =VAF= Payed Jan2019
Ed D'Arcy
RV6-A 5,200+ hrs, R-44 1,600 hrs, Helicycle 320 hrs, gyro sold,35,000 miles flown in 2015 
Stuart, Fl / S WINDSOR,Ct / Virgin Gorda, BVI - under major repair from hurricane damage
VAF #840 EAA AOPA FAC FABA QB SPA
addicted pickle ball player
https://i.postimg.cc/tn3h4svg/IMG-3101.jpg
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03-11-2011, 05:12 PM
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Join Date: Jan 2008
Location: MERRITT ISLAND, FL
Posts: 360
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I have about 500 hours
with them in my IO-540 installed on a Steen Skybolt. I fly 30 minute acro hops and despite that abuse the plugs seem bullet proof.
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Don Stiver
RV8 "Little Pill" N6371S, Merritt Island, Fl.
BPE IO-390, Dual P-mag, MT 3-blade, AFP system
Steen Skybolt: Sold
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03-12-2011, 04:28 AM
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Join Date: Feb 2005
Location: 20km outside of Zurich, Switzerland
Posts: 468
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Ask Mattituck?
Hello,
Mahlon was also posting this here, that the fine wire spark plug if you take care and rotate them regurarly, are good till TBO!
My friends and I with engines from Mattituck, have the fine wire spark plugs installed, so far fine! We are still building or started flying, so ask again in a few years
Regards Dominik
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03-12-2011, 04:53 AM
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Join Date: Mar 2005
Posts: 5,685
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I have tried both
I started out with massive electrode plugs and flew for a few years with them with no problem. Then I switched to the super expensive fine wire plugs in search of speed. I have flown for several years with these and I only had problems with the initial installation. I was used to setting the gap as a "get it right function" without a lot of concern for the integrity of the electrode itself. Imagine my feelings when the electrode on a brand new plug cracked. I called Unison (the manufacturer of the plugs - I wanted to use their plugs with their ingnition system (LASAR) - the massive electrode plugs used earlier were Champions) and spoke to technical support about the incident. The guy I talked to said the electrode is very hard and if the plug gap is in the acceptable range you should never try to fine adjust it. It will tolerate some movement in one direction but cracking is common if you go too far and try to reverse direction. He offered a free replacement. Since then I clean the plugs and rotate engine plug locations top to bottom and side to side at each annual and I have experienced no problems. It is not uncommon for my plugs from the lower locations to be wet. I have detected no aircraft speed improvement from using the fine wire plugs.
Bob Axsom
Last edited by Bob Axsom : 03-12-2011 at 04:55 AM.
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03-12-2011, 12:03 PM
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Join Date: Sep 2010
Location: Sao Paulo, Brasil
Posts: 72
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No more foul plugging
I've flown 750 hrs on an IO 540 with these fine but expensive plugs (Champion), and had NEVER any plug fouling issues.
I can't remember having to burn lead out of my rough running and missfiring engine during magneto check by pulling the mixture knob at 2000+ RPM. 
Last edited by bignose : 03-12-2011 at 02:18 PM.
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