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Engineering/Technical Ask technical questions about cars. Do you know how a car engine works? |
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05-15-2022, 09:11 PM | #1 | |
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Spark Plug Anomaly
I've seen my share of strange things over the years, but this one is a mystery. I pulled the two plugs from an off-road engine and found the side electrodes oddly bent. The two on the right are from the engine in question, and the one on the left is a "normal" plug from a running engine.
Closed observation reveals that the side electrodes seem to have been cut back, bent inward to the center electrode, and possibly filed at a slight angle. The gap appears to be almost correct, at 0.025" (spec) but it certainly struck me a unusual. Any speculation about why?
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shorod (05-16-2022)
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05-16-2022, 05:28 AM | #2 | |
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Re: Spark Plug Anomaly
It's called side gapping. There is a whole theory behind how it is supposed to put more of the spark in the fuel mixture.
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shorod (05-16-2022)
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05-16-2022, 07:30 AM | #3 | |
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Re: Spark Plug Anomaly
Yup, some racing plugs are made this way, to save money I did this myself in the pictured race car, supposed to be effective in wedge chambered heads.
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shorod (05-16-2022)
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05-16-2022, 08:55 PM | #4 | |
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Re: Spark Plug Anomaly
Thanks Stealth (and Max). I don't recall encountering it exactly like that before, but I've only been doing this since about 1975.
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05-22-2022, 07:46 AM | #5 | |
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Re: Spark Plug Anomaly
That is interesting, I have been in the industry for a long time as well and I haven't even heard of this technique before...
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