For the sake of simplicity I will stick with Champion designation, can anyone offer a decode of what the letters actually mean?
More specifically what is the meaning of the prefix R when differentiating between N7Y and RN7Y.
The sufix C and CC variants also occur.
pmh (was peter)
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The "R" means resistor plug (helps radio suppression).
The "7" is the heat range.
The "Y" means that the plug has a extended nose core.
The "C" and "CC" mean copper coated electrodes (not absolutely sure about this)
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Sorry, I think the "N" is the reach (7/8 inch),ie length of thread.
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Have a butchers at this link -
www.ngksparkplugs.com/techinfo/spark_plugs/
Steve.
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C means one electrode copper plated;CC means both.Most new cars will hava a P or PP-they're Platinum plated-usually gives a life of 50,000+ miles.
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Thanks to all for info, the link from Shigg is an excellent source of NGK info.
For cross Brand information it is worth looking at
www.flashpoint-direct.co.uk/scrc.htm
pmh (was peter)
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