Steph :
I'd go with the RN9YC, and then take a reading after a 1000 miles or so.
I don't have my Champion chart handy (translation : I'm too lazy to go
look for it <g>), but the letters mean :
R - Resistor for RFI suppression (makes no difference to heat range)
N - Basic configuration (reach, thread size, seat type, etc.)
12 - Heat range (ISTR higher numbers are hotter, but I could be wrong)
Y - Extended tip
C - Copper core center electrode
(basically a materials improvement, makes no difference to heat range)
My Haynes also specifies the N9Y plugs, for a Mk-III (no spec for other
models ???)
Randall
Stephane St-Amant wrote:
>
> Thanks for the info.
>
> Just one question. I went to my autopart store and when I asked for the
> spark plugs, the reference number out of their books was Champion RN12YC.
> He said that it replaces the N9Y. I couldn't find the N9Y but saw RN9YC.
> Yet, their book said RN12YC.
>
> The other number on the box said 404CC (RN12YC) and 440CC (RN9YC) i think.
>
> Any thought on that?
>
> Steph
> ----- Original Message -----
> From: <Chip19474@aol.com>
> To: <steph71tr6@crosswinds.net>; <triumphs@autox.team.net>
> Sent: Sunday, May 28, 2000 11:06
> Subject: Re: Spitfire MKIII Oil & Fuel Filter
>
> > In a message dated 00-05-26 21:33:10 EDT, steph71tr6@crosswinds.net
> writes:
> >
> > << What are the over-the
> > counter part number of the following: (already have some but correct me
> if
> > I'm wrong!)
> >
> > Steph,
> >
> > Here's the numbers/brands I use for my '70 Spit Mk3 1296cc:
> >
> > Oil filter: Fram PH16
> > Engine Oil: SAE 10W50 or 10W40 Castrol Syntac 20w-50
> > Fuel filter: ordered from VB
> > Points and Condenser: delco parts - don't forget the rotor & cap - can
> get
> > over the counter from a NAPA store
> > Spark Plug: Champion N9Y - YES
> > Spark Plug Cables: >> still look good - about 2 years old
> >
> > Good luck,
> >
> > Chip Krout
> > '76 TR6 CF57822U (restoration underway)
> > '70 Spitfire Mk3 FDU78512L (ready for another driving season)
> >
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