The C at the end indicates the elctrode is copper (or some
portion of copper). The N9YC will last longer and give a more consistent
spark then the N9Y. As far as design and looks of the plugs they are the
same. The N and Y indicate the length and width of the plug. The 9 is
the tempeture range, and if the number is prefix with R that indicates a
resistive plug (to plug out noise on the radio). In my TR7 I've had the
best luck with RN12YC.
Glenn
On Sat, 8 Nov 97 17:59:34 -0000 ping0160
<Bernard.Christian-Woodruff@ping.be> writes:
>I've just been reliably informed by my local parts dealer that there
>is
>no difference between Champion N9Y and N9YC spark plugs. Is this true?
>
>Will it cause a problem if I use the N9YC plugs in my MkIII spit?????
>
>Bernard
>'69 Spit MkIII & GT6+
>
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