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sparkplugs.com »
https://forums.nicoclub.com/sparkplugs-com-u23266.html
Wed Oct 19, 2005 10:17 am
You are absolutly correct in your reasoning. Some combustion chambers (such as rotary motors) require the spark plugs have the ground electrode placed on the side of the center electrode instead of below as a traditional plug is. This type of firing tip tends to erode faster than a typical plug, and as you know, when the gap is too great between the center and ground electrodes, it will cause misfiring. Thus, by having more ground electrodes you extend the life of the plug in that particular engine.
Each manufacturer has their own version or line of multi-ground plugs - Bosch's is called +2 (dual-ground) and +4 (quad-ground). Many people sometimes get the idea that because there are multiple electrodes the plug will spark at multiple locations or last super long. But, as you already stated, electricity follows the path of least resistance. so it will only spark from one tip at a time. Ultimatly, a multi-ground plug will not perform better and may perform worse than a traditional plug, unless the engine is designed for the use of a multi-ground plug.
I haven't heard about the OEM wires having a problem in the PT cruiser. We have a custom wire set we created just for the PT Cruiser and SRT-4. Some of the manufacturers made all 4 wires the same length, but the distance between the two middle cylinders is significantly shorter, so when we made the custom wires, we had the two middle wires made shorter so that there isn't any extra wireage looping around. So if you are having a problem with the OEM wires, there are others available.