Quote:
Originally Posted by kenwelch
Thanks for the great pictures showing the new and used plugs.
The secondary ignition voltage requirement is less when the electrodes have sharp surfaces (edges and corners) to jump from. This is the reason for multi-electrode plugs that provide more sharp surfaces. As you can see in the photos the used plug electrodes (center and ground) are rounded which requires higher voltage to bridge the gap. The new "sharp" electrodes reduce the required voltage and reduce the chance of misfire under load conditions.
You might also notice that there looks like a bit of carbon "bridging" forming on the used plug that can create a short circuit or no spark because the electrons will travel the path of least resistance. No spark causes a misfire that can be felt at idle and less power.
All this makes me want to change my plug early, because of the short trip driving.
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That's very good information. Thank you Ken.
