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Home✈️Aircraft🚁HelicopterGasser Model RC HelicoptersOther › Plugs and Reading them?
09-07-2006 03:36 AM  14 years ago
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victor55ca

rrApprentice

Vancouver BC

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Plugs and Reading them?
These are from my pred 231, it seems to be smoothing out. I fried a motor by going to lean so I am being very careful. I currentley have my needles at 1 1/4 low and 1 3/8 on the high. I am running 2.6 oz of oil per gallon of Coleman. Do these plugs look OK? They look to be very dark tan, too rich?

Vince
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09-07-2006 03:46 AM  14 years ago
rbort

rrProfessor

Franklin, MA - USA

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Your pictures are very dark
Can't even see the plug! Try to put on a bright light and then take the picture...

-=>Raja.
MA 1005 Hanson 2703D, 4400 flts
Spectra 27 3DMax, 3460 flts
Whiplash V1-2 Hanson 300, 1995 flts
Whiplash V2 Hanson 300, 923 flts
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09-07-2006 04:21 AM  14 years ago
victor55ca

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Vancouver BC

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I will try to post some better ones tomorrow.
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09-10-2006 06:07 PM  14 years ago
Sig Dawg

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Yorkton, Sask., Canada

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I think it is usually best to check them right after a flight where the engine has been working to be sure you are getting a correct read. If the engine has idled for some time you are likely to have a darker plug than when it is a operating speed so you won't know what is going on at operating speed which is most important. You could have a lean condition at full throttle and not know it until Kaboom if you don't read the plugs at the correct time.
I would suggest going flying and really work the engine, land and remove the plug immediately to see what is happening.
Jason
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09-10-2006 07:56 PM  14 years ago
Coolrunnin

rrVeteran

Manchester U.K.

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The important thing, as Sig Dawg says, when reading plugs (in almost every engine actually) is that the engine is up to normal operating temperature and RPMs before the reading is taken and that the engine idles as little as possible before the engine is cut to take the reading. If you ensure these conditions are met, you are going to get a reasonably accurate reading.

In reality, it obviously isn't usually practical (or safe!) to press the kill switch in a model heli while it is hovering to cut the ignition at the point where you want to know the mixture (as it would be done on something like a dirtbike engine) so you just bear in mind that the actual mixture is going to be slightly leaner than it appears at the plug after you have shut the throttle to stall the engine. Keep the color ever so slightly darker than ideal (rich-tea biscuit color for UK folks, I don't know about the US equivalent ) after a swift throttle cut and you are about on the money.
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