So, why do they call them HOT & COLD plugs?
These are NGK IFR5L 11's, which I believe AREN'T OEM spec, do they look OK (only took out rear cylinder)
or is it wise (& expensive) to change them to the OEM spec?.......My engine seems to run VERY hot always!
Hot or cold refers to the temperature at which the electrodes operate. This is determined by the length of the ceramic cone that supports the center (usually positive) electrode. Longer cone means longer path for heat dissipation= hotter. Shorter cone means more rapid heat transfer= colder.
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