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Whats the best spark plug for a c-85

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22 Sep 2021 12:53 - 22 Sep 2021 12:54 #1 by Randy Branson
Replied by Randy Branson on topic Whats the best spark plug for a c-85
I just cleaned, checked the gaps and rotated my plugs.  16-21 was what champion recommended...I sort of split the difference and decided on 19 since that is what they (all but one) turned out to be anyway.  If  I thought I could get better performance I'd definitely pull them again and regap to 16.
Last edit: 22 Sep 2021 12:54 by Randy Branson.

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08 Dec 2020 08:32 #2 by Thomas Ryan
Replied by Thomas Ryan on topic Whats the best spark plug for a c-85
16 is what I'm going to set them at, I agree, a smaller gap has benefits for that engine, as it's almost at its limits in power now, considering what we are asking it do do. 85 HP isn't much, the carb, prop and plugs make a big difference in performance I know, and I've addressed all three of them, so lets see what happens now. Thanks for the advice.

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02 Dec 2020 17:03 #3 by Matt Gunsch
Replied by Matt Gunsch on topic Whats the best spark plug for a c-85
16-21 per champion, you need a smaller gap because of the magneto, it does not put out as much current as the electronic ignition in your car.

A&P, IA, PPSEL
too many years GA and Warbird Maint
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01 Dec 2020 11:33 #4 by Thomas Ryan
Replied by Thomas Ryan on topic Whats the best spark plug for a c-85
Thanks for the info, but I have the champion REM 40E plugs and was told a gap of 17 is right, is that right? Seems a bit too close, but perhaps it should be? Does that sound right? I don't see that in my book, it says 16 to 21, but isn't specific.

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30 Nov 2020 22:20 #5 by Matt Gunsch
Replied by Matt Gunsch on topic Whats the best spark plug for a c-85
Fine wires are the best, but also the most money, Massive electrode plugs work fine. If you want the best performance make sure the mags are in good shape and the timing is correct. If you have a chance when the mags are off the engine, turn the mag drive and feel the amount of magnetism in the rotor, it should snap into place when the poles are aligned, if you can barely feel the magnetism, the mags could use some work.

A&P, IA, PPSEL
too many years GA and Warbird Maint
Check out the Ercoupe Discussion group on facebook

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30 Nov 2020 09:50 #6 by Thomas Ryan
Whats the best spark plug for a c-85 was created by Thomas Ryan
I'm looking for improved performance in my C-85 and I'll told that there is a better spark plug being used, but I'm not burning auto fuel, only 100LL so, what is the best spark plug for the best performance for that engine? Anyone have any suggestions?

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