Looking at a May 1997 Champion catalog, I see the following plugs that were
available:
RN4YC - Stock # 904 (Autolite #51)
RN6YC - Stock # 339 (Autolite #51) (AC - R41XLS)
RN7YC - Stock # 332 (Autolite # 52 or #62) (AC - R42XLS)
I didn't see any reference to an (R)8YC
Looking at a 1991 Autolite Catalog, 6 cylinder Triumphs were recommended to
use an AP63 or AP64 Plug - the "AN" designation was an up market prefix, I
believe (like platinum). A 63 or 64 would have been the regular market plug.
There were also #51 or #52 plugs recommended
Looking at the 1991 AC catalog, there was the 42XLS or the R42XLS plug.
Also, from the 1991 AC catalog, '68 - '73 6 cyl. Triumphs used R42XLS plugs and
'74 - '76 6 cyl. Triumphs used R44XLS plugs.
Did I confuse everybody?
Gosh - I just love the old printed catalogs! They have so much information that
is easy to obtain and digest.
What is the symptom that you have noticed?
Here's an interesting site -
https://www.sparkplug-crossreference.com/
Alex Thomson
'73 TR6 and 3, 2 cylinder John Deeres plus a Case VAC and a Farmall H.
-----Original Message-----
From: Triumphs [mailto:triumphs-bounces@autox.team.net] On Behalf Of Rochlin
Robert
Sent: Tuesday, June 6, 2023 2:39 PM
To: Triumphs; 6pack@autox.team.net
Subject: [TR] Spark Plug Heat Range
Iâ??m looking for a spark plug that is just a little cooler than the
stock Champion N9YC plugs that Iâ??m running. Iâ??ve had no luck finding
Champion N8YC plugs and each manufacturer has a different designation for the
heat range for their plugs so itâ??s hard to do a direct comparison . Does
anyone have a source for cooler plugs? Iâ??m not concerned if they are not
Champions.
Best,
Bob
â??72 TR6
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