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04-29-2018, 08:44 PM
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Join Date: Apr 2011
Location: Cincinnati, OH
Posts: 2,791
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Quote:
Originally Posted by RV6_flyer
IF the plugs were in my hangar, I would use a spark plug erosion gauge to see if they are still in mechanical spec as well as do a resistance check.

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purchased one of these. thx, I was not aware of them.
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Steve Melton
Cincinnati, OH
RV-9A, Tip-up, Superior O-320, roller lifters, 160HP, WW 200RV, dual impulse slick mags, oil pressure = 65 psi, EGT = 1300F, flight hours = 800+ for all
Simplicity is the art in design.
My Artwork is freely given and published and cannot be patented.
www.rvplasticparts.com
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09-10-2018, 03:15 PM
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Join Date: Apr 2011
Location: Cincinnati, OH
Posts: 2,791
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700 hr spark plugs
replaced all but one of them. 700 hrs was running fine but time to change. one had been dropped and replaced earlier, #3 down.

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Steve Melton
Cincinnati, OH
RV-9A, Tip-up, Superior O-320, roller lifters, 160HP, WW 200RV, dual impulse slick mags, oil pressure = 65 psi, EGT = 1300F, flight hours = 800+ for all
Simplicity is the art in design.
My Artwork is freely given and published and cannot be patented.
www.rvplasticparts.com
Last edited by Steve Melton : 09-10-2018 at 03:18 PM.
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09-10-2018, 03:18 PM
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Join Date: Sep 2015
Location: Nevada City Ca
Posts: 198
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I have 1200 hrs on fine wires wouldn't run anything else with magneto ignition
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09-10-2018, 09:38 PM
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Join Date: Aug 2005
Posts: 97
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Quote:
Originally Posted by Robb
I have 1200 hrs on fine wires wouldn't run anything else with magneto ignition
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Quite frankly, I have run fine wires, and have had more trouble with them, at least in the Champion brand than with massives. Most eventually failed resistance test badly, going over 100K ohms. One recently removed failed in flight test, while okay on resistance and appearance.
Usually have trouble with intermittent misfire with older fine wires.
The other issue is that they are fragile to adjust gap, and waste a lot of money if one is dropped. To compete economically with massives you have to manage a full 2000 hours on a fine wire.
GAMI issued a service bulletin strongly recommending against fine wires of the C brand in a turbo normalized or turbocharged engine, where electrode ceramic failure was common.
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Kelly McMullen
A&P/IA
EAA Tech Counselor
KCHD
RV-10 40866
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09-11-2018, 02:43 PM
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Join Date: Feb 2005
Location: Wisconsin
Posts: 612
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Kelly,
I've heard that Champions fine wire plugs are more of a "stay away" product. I've been running fine wires in my -10 for well over 1,000 hours with no issues, and nearing 300 on the -14. But, mine were Autolite/Tempest. I treat them very well when I pull them though because as you mention, dropping one is an expensive lesson.
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09-11-2018, 07:14 PM
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Join Date: Apr 2011
Location: Cincinnati, OH
Posts: 2,791
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what is this "pull them thru method"? I told myself I would never drop one, but I did.
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Steve Melton
Cincinnati, OH
RV-9A, Tip-up, Superior O-320, roller lifters, 160HP, WW 200RV, dual impulse slick mags, oil pressure = 65 psi, EGT = 1300F, flight hours = 800+ for all
Simplicity is the art in design.
My Artwork is freely given and published and cannot be patented.
www.rvplasticparts.com
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09-11-2018, 11:38 PM
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Join Date: Dec 2011
Location: Livermore, CA
Posts: 6,797
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There?s no ?r?
Quote:
Originally Posted by Steve Melton
what is this "pull them thru method"? I told myself I would never drop one, but I did.
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?...when I pull them, though, ...?
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09-12-2018, 04:31 AM
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Join Date: May 2013
Location: Mount Vernon, Wa
Posts: 643
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I’ve been annealing spark plug washers with a propane torch and some tap water in my last empty Starbucks coffee cup for awhile now. Just torch ‘em till they glow orange. Then quench in water and burnish with scotchbrite when cooled.
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Ken W.
Mount Vernon, WA
2020 VAF Supporter
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09-12-2018, 04:45 AM
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Join Date: Aug 2016
Location: Asheville, NC
Posts: 2,104
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I guess I'm getting lazy in my old age because for 30c each, I just buy new ones (I have a box of 100).
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(2020 dues paid)
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09-13-2018, 05:06 PM
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Join Date: Apr 2011
Location: Cincinnati, OH
Posts: 2,791
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Quote:
Originally Posted by snopercod
I guess I'm getting lazy in my old age because for 30c each, I just buy new ones (I have a box of 100).
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that equals 3000c.
__________________
Steve Melton
Cincinnati, OH
RV-9A, Tip-up, Superior O-320, roller lifters, 160HP, WW 200RV, dual impulse slick mags, oil pressure = 65 psi, EGT = 1300F, flight hours = 800+ for all
Simplicity is the art in design.
My Artwork is freely given and published and cannot be patented.
www.rvplasticparts.com
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