Will unleaded fuel show clear fuel ring on plug
#1
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Made some 200 shot runs yesterday on new plugs. Engine was cut off after the run each time. Could not see any fuel ring on the ceramic when I cut the threads off. The strap looked about right for timing. Also ran my FJO serial wideband at the same time so I could make a comparison. Fuel was increased untill AFR was 11.60 - 11.70 and plugs stayed clear white. The fuel I'm using is VP 109 racing unleaded. Plugs are #8 NGK's and timing was at 19*. Are these results normal for unleaded fuel?
#2
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I have had to make 2 or 3 passes with a new set plugs then towed to pitts then change the plug and cut it. This is after you get it in the ball park first. That way there is a good line on the porcelin.
#4
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Attached are pics of typical plugs with 4-5 passes and lots of idling and one showing just one pass on a new plug and no idling.