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Re: Hot spark
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Posted by Bob - MI on October 18, 2004 at 05:34:44 from (66.14.205.20):
In Reply to: Hot spark posted by other Will on October 18, 2004 at 05:15:27:
Hotter plug range is different from "hotter spark". Plug range heat is dictated by the exposed length of the ceramic insulator that surrounds the electrode. Longer length = more exposure to combustion = higher retained heat. Colder range works the other way. Only reason that I know this is due to growing up in Michigan and having two-stroke motorcycles and snowmobiles. Depending on the ambient temp. we would have to switch plug ranges and actually used to carry different ranges in the tool kits. General rule used to be that the coldest plug that won"t foul out is better. Too hot of a plug could cause pre-ignition and that"s bad. Hotter spark is just that and it"s a momentary thing that triggers the combustion cycle. I"m sure that some of it is hype but too little spark is a bad thing so it kind of boils down to what works for your engine application. High performance engines with high compression ratios would be good candidates for "hotter spark". Those engines that use a lot of oil may also benefit but they would generally need hotter plugs too. If your engine runs good on stock plugs use them.
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