[6pack] [TR] Spark Plug Heat Range

[Alex & Janet Thomson]

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 at autox.team.net] On Behalf Of Rochlin Robert
Sent: Tuesday, June 6, 2023 2:39 PM
To: Triumphs; 6pack at autox.team.net
Subject: [TR] Spark Plug Heat Range

	I’m looking for a spark plug that is just a little cooler than the stock Champion N9YC plugs that I’m running. I’ve had no luck finding Champion N8YC plugs and each manufacturer has a different designation for the heat range for their plugs so it’s hard to do a direct comparison .  Does anyone have a source for cooler plugs? I’m not concerned if they are not Champions.
	Best,
	Bob
	“72 TR6
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