Tony,
Higher performance engines (higher compression, more radical cam,
supercharged, etc) invariably run best with colder plugs than what is
recommended for a stock engine. Running a hot plug in a zoomy engine
will result in melted plugs... if you're lucky.
Now that many engines come with computer controls, the spark plug and
wire technology have advanced to the point where you can get the cold
heat range, as well as high spark energy, and good RF interference
suppression to boot. Some ignition systems such as the Jacobs units
sense feedback from the coil to tell whether or not the plug is firing
properly and will adjust the spark energy (and re-fire the plug if
necessary) to burn through plug-loading situations. This further allows
you to run the proper heat range plug for performance considerations,
and still loaf around town without fouling the plugs. Many of the
computerized aftermarket ignition (and EFI) computer makers recommend
strongly against solid-core wire and against non-resistor plugs, because
the garbage put out by these plugs will interfere with the controller in
all but the most careful installations.
Theo
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