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Originally Posted by Logic
'sharp-ish' points on the piston face or in the head tend to get hotter than other areas and can also start knock.
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That's also been myth-busted. Sharp edges in the right spots can actually decrease knock as it can help fuel to reatomize. One of the worse combustion chambers for knock was the hemispherical head.
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IIRC thats why spark plugs often have copper in the electrode; to get the heat out of it and prevent this.
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Sparkplugs have various levels of insulation to keep their temperatures up. It depends a lot on the application, but the idea is hotter, insulated spark plugs keep the carbon burned off. Too much insulation and therefore too hot of a spark plug could cause a problem such as pre-ignition.