Quote:
Originally Posted by Speedster Jeff
What makes the heat range lower on a spark plug? Can something be added in between the wire and plug to boost the heat range on new plugs? I would rather leave these plugs in my collection and use new plugs and have to change them out once a year verses using these nos plugs.
Thank you.
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I have used motorcraft F11 that people people discard.
A slightly leaner mixture will keep them cleaner. Too lean will melt/crack them, as it would any plug.
If you burn lots of oil they might still foul but i never found this to be a problem.