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Old 01-23-2021, 05:31 PM
TimO TimO is offline
Join Date: Feb 2005
Location: Wisconsin
Posts: 638

That's why the racing plugs are better. If they're iridium, they really don't wear on that electrode, so you get consistent gap for the life of the plug. The TT series I mentioned previously has iridium on both electrodes, so it shouldn't wear at all. The ones Dan showed a pic of have only iridium in the center electrode, so the ground still wears. That's really the difference. And for <$10/plug, they seem to be a good value, considering it can be less than ideal to have a gap that wears a lot over time. I've run some standard plugs for a couple hundred hours (won't do that again) and had the gap get huge. Not so much with the standard iridium, and not at all with the TT.
Tim Olson - CFI
RV-10 N104CD - Flying 2/2006 - 1400+ hours
RV-14 N14YT - Flying 6/2016 - 350+ hours
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