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Spark plug color
I replaced my plugs and took a good look at them. They all looked good except I am a little Leary of the #1 cylinder. 7 of the plugs are a nice tan color. The #1 cylinder is more of a gray color and is the top photo. The rest look like the 2nd. My afr’s are low 13s at wide open , cruise is in the upper 14 range. Idle is upper 12s . Dart single plane intake , QFT 850 carb.
https://cimg2.ibsrv.net/gimg/www.off...9419e7ce1.jpeg https://cimg4.ibsrv.net/gimg/www.off...39dbd8413.jpeg |
Shoot for mid 12 to upper 12 @wot. Cannot help abbout reading the plug color.
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Originally Posted by smokediver
(Post 4866122)
I replaced my plugs and took a good look at them. They all looked good except I am a little Leary of the #1 cylinder. 7 of the plugs are a nice tan color. The #1 cylinder is more of a gray color and is the top photo. The rest look like the 2nd. My afr’s are low 13s at wide open , cruise is in the upper 14 range. Idle is upper 12s . Dart single plane intake , QFT 850 carb.
https://cimg2.ibsrv.net/gimg/www.off...9419e7ce1.jpeg https://cimg4.ibsrv.net/gimg/www.off...39dbd8413.jpeg |
No way to really tell anything from plug color on plugs that have been run at various rpms and at idle for hours.
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