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HomeAircraftHelicopterEngines Plugs Mufflers Fuel › Black deposit on glow plug (OS 50 Hyper)
10-12-2005 04:13 PM  12 years agoPost 1
bastun

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Longmont,CO,USA

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I just replaced glow plug in my OS 50 Hyper.
The glow plug had a lot of black deposit on its coil.
What is it ? Is it ok or something's wrong ?
I replace glow plug regularly every 3-4 gallons.
Dmitriy.

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10-12-2005 04:18 PM  12 years agoPost 2
Raffy

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Chicago, Illinois

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Your engine is running lean.

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10-12-2005 04:29 PM  12 years agoPost 3
bastun

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Longmont,CO,USA

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The back plate is almost cold, I can touch it and keep my finger on it for any long time.
Or it is not the right measure of how rich/lean I'm running ?

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10-12-2005 04:33 PM  12 years agoPost 4
Dr Lodge

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Guildford, Surrey - UK

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If its black I would suggest too rich, too lean will cause the glo to be white. Ideally there should be a small amount of grey deposit.

Vibe 90, Vibe 50, Vigor CS x2,
Dyna-x, Knight 503D, Logo 10,
TRex 500, Furion, Gaui EP200

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10-12-2005 04:39 PM  12 years agoPost 5
bastun

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Longmont,CO,USA

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It's not grey, it's black.
And not small amout - it's like stalactite .

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10-12-2005 04:43 PM  12 years agoPost 6
Dr Lodge

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Guildford, Surrey - UK

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Carbon is black, and carbon is a leftover of an over-rich combustion cycle. Try leaning the engine a bit, one flight on a new plug and the plug should still look like new.

Vibe 90, Vibe 50, Vigor CS x2,
Dyna-x, Knight 503D, Logo 10,
TRex 500, Furion, Gaui EP200

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10-12-2005 04:52 PM  12 years agoPost 7
bastun

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Longmont,CO,USA

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Thanks for help, I will try to lean and see what happens.
I should keep my back plate warm, not hot - is it true ?

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10-12-2005 04:58 PM  12 years agoPost 8
Dr Lodge

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Guildford, Surrey - UK

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The back plate is almost cold
which implies its too cold also. It should be warm, able to hold your finger on the plate for a few seconds.

Vibe 90, Vibe 50, Vigor CS x2,
Dyna-x, Knight 503D, Logo 10,
TRex 500, Furion, Gaui EP200

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10-12-2005 05:07 PM  12 years agoPost 9
bastun

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Longmont,CO,USA

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Lean until back plate becomes warm, not cold.
I should be able to hold my finger for a few second, not for infinite time.
Is it true ?

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10-12-2005 05:11 PM  12 years agoPost 10
Dr Lodge

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Guildford, Surrey - UK

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That's about it. There should be plenty of smoke, and good response. I always tune my engines by starting on the rich side, then gently lean out the engine until I get good power and not-too-hot running. You'll know when the engine is running "on song" - give it a go.

Vibe 90, Vibe 50, Vigor CS x2,
Dyna-x, Knight 503D, Logo 10,
TRex 500, Furion, Gaui EP200

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10-12-2005 05:18 PM  12 years agoPost 11
bastun

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Longmont,CO,USA

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Thanks for help.
I will do that this weekend.

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