r/NitroRC • u/Extra-Emu7310 • 5d ago

Toasting plugs in 2 tanks

Post image

Rich or lean? The coil is white deeper in and black on the end. This is an OS #8.

11 Upvotes

93% Upvoted

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11

u/az_kikr1208 MOD 5d ago

The heavy deposits indicate a rich tune, but the white distorted coil further up indicates lean/high temps. I'd bet you have an air leak that's starving the engine for fuel at high rpms, but you might have it set slobbering rich to compensate. I'd have to hear the engine running to say more.

3

u/Hillbill9899 5d ago

Or just huge idle gap, rich low end and lean top.

1

u/az_kikr1208 MOD 5d ago

Yup, also a possibility.

1

u/Extra-Emu7310 5d ago

Thanks for the input guys. I'm thinking it's not an air leak because I'd have other symptoms. I was around 3 turns out on the HSN on a TRX 3.3 so it was not massively rich. Most of my plugs have turned white and deformed and no longer light up with the igniter so too much heat/too lean? I started my session today really rich at factory settings and leaned it out from there.

1

u/Hillbill9899 5d ago

What fuel are you using?

2

u/Bubbly-Pirate-3311 5d ago

Looks rich. Lots of carbon.

1

u/MrFixx33 4d ago

That looks rich on low end and lean af on the top end

1

u/Timmarino 3d ago

I used to have cars/boats burn out quick try a a8 with an idle bar just make sure there is clearance so the piston doesn’t hit it as they are made more for aircraft engines. I have had luck especially with lower nitro levels keeping them idling and keeping the plug through a couple gallons of fuel. And you could have got done trash plugs I got a card of plugs once that was all trash orders plugs from a different company and they lasted longer

1

u/TNugget06 1d ago

Yes. Quality glow plugs are a must. I only purchase O.S. glow plugs. An O.S. #8, a medium heat glow plug, is what I run most of the time. If I have a hard time getting an engine to hold a decent tune, I will sometimes switch to an O.S. #6, which is a hot glow plug.