Quote:
Originally Posted by cooper1965
Very basically, A projected tip has a long red hot piece of metal further in the chamber , heat range only deals with the ceramic surrounding the center electrode.
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Much appreciated. I also did some reading on the subject. For anyone else wondering.. non protected is for high compression or boost applications it essentially makes it harder for “hot spots” in the chamber, decreasing the chance of detonation. Go with the non projected for our cars!