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Old Sep 07, 2010, 06:25 AM
Crash
zen3's Avatar
United States, PA, Slatington
Joined Jun 2007
176 Posts
Question
11.1 glow plug

What is the best glow plug for a 11.1 kb outboard? And if I am using the wrong one, what would the performance issues be?
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Old Sep 07, 2010, 06:49 AM
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Canada, ON, Whitby
Joined Aug 2008
8,907 Posts
All I ever ran was McCoy MC9's, but unless you're WAY off it should be fine. You definitely want to avoid any plugs that have an idle bar (little bar partially covering the coil).

What symptoms do you have, might be easier to start with that?
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Old Sep 07, 2010, 08:14 AM
RC boat Rock Star
Kalamazoo, MI
Joined Apr 2004
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Mc Coy MC-9 or a K&B 1-L.
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Old Sep 24, 2010, 01:40 PM
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Detroit
Joined Aug 2006
79 Posts
A note that the only MC-9s I've been able to find lately are Dynamite branded, and a bit cheaper than McCoy used to sell them for. They seem to burn out a lot quicker...
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Old Sep 24, 2010, 10:34 PM
RC boat Rock Star
Kalamazoo, MI
Joined Apr 2004
2,933 Posts
I found the opposite true here as when Dynamite started carrying the McCoy's the price shot up! This was also at a time when the price of the coil wire shot up. There were also quality issues at that time too as some plugs the coil wasn't fully welded in or even on some of them completely gone.
I've got some O'Donnell plugs but haven't tried them yet. The price is lower than the McCoy's and the quality is supposed to be much better.
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Old Sep 25, 2010, 10:34 AM
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Joined Oct 2008
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I've tried Nova turbo plugs and O'Donnell, the Nova ones last much longer. I did find that the O'Donnell plugs have far more empty space around the filament too, whether that makes much difference I don't know..
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Old Sep 25, 2010, 10:43 AM
RC boat Rock Star
Kalamazoo, MI
Joined Apr 2004
2,933 Posts
That empty space helps to get the fuel mixture up in there a little more and sometimes can be the only difference between heat ranges.
I was talking to Jim Irwin who before his health started getting bad was going ot get into the glow plug business by having Merlin make some to his spec's. He felt that he size of the hole on theirs was too small yet they used the same size filament wire in most of them. I tried some Merlin's but wasn't happy with them. Where I really noticed the difference between plugs back then was in my .12 engines. They would run great with MC-9's but when I dropped a Merlin in they would barely run at all.
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