On Thu, 15 Oct 1998, Tomislav Marincic wrote:
> Bob,
Hi.
> Regarding spark plugs, it was the early cars that used the hotter
> N12Y's, the later ones (and the PI cars) used the colder N9Y's. I agree
> it's
> counterintuitive based only on compression, but perhaps other factors
> were at work making the engines run hotter after 1973 despite the lower
> CR?
Okay. I've been using the wrong plugs for 25 years.
FWIW, in my '74 I tried using the Accel equiv. of the N9Y, they kept
fouling. I'm using the N12Y equiv. now and they work fine.
> Anyway, my TR250 owner's manual says N12Y and the Bentley
> confirms it for pre-'73 TR6's on page 51.
Okay.
> Best Regards,
>
> Tom Marincic
> CD3574L
Later,
rml
TR6's including CF14111U
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