> So what are the benefits of running a hotter plug anyway? Cleaner running?
> Improved fuel economy? Or is just a matter of what works best in your car?
Just a matter of what works right. Too cold a plug won't burn off deposits, and
eventually foul. Too hot a plug is subject to glazing, and overheating (can
cause pinging), and won't last as long as it should.
www.ngksparkplugs.com/techinfo/spark_plugs/techtips.asp
IMO if you had to change the mixture to match the plugs, the new plugs are
wrong. I'm guessing they were partially fouled, and misfired with a lean
mixture. FWIW, this is one of those cases where an electronic ignition might
help.
According to the cross-reference I found, the BP6ES covers N8Y through N10Y.
Randall
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