Quote:
Originally Posted by Citroënbender
It’s hard to find accurate information on exactly how much iridium (alloy) is in the plugs and how it’s incorporated. I’d presumed a surface depositing process but some promo guff infers a discrete tip - you’d think this compounds risk of it coming loose and therefore causing FOD.
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It is only the precious metal tip that is fused to the center electrode.
Some plugs are "double platinum or iridium" , and they have a small disc fused to the ground strap.
http://densoautoparts.com/spark-plug...-platinum.aspx