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spark plug heat range

To: british-cars@hoosier, rodb@ee.ubc.ca
Subject: spark plug heat range
From: Roland Dudley <cobra@dtc.hp.com>
Date: Tue, 1 Oct 91 13:34:50 pdt
Subject: Re: Spark Plugs
To: british-cars@hoosier.utah.edu (British Cars Mailing List)
Date: Tue, 1 Oct 91 12:42:46 PDT
Reply-To: rodb@ee.ubc.ca
From: rodb@ee.ubc.ca


>Let me make a guess:

>       - A "R" at the front means resistor
>       - The number, like "10", is the heat range
>       - The "C" used in new Champion numbers just means copper.

>So is an 11 a hotter plug? What does the "N" and "Y" stand for?  What
>other types of plugs are people using in there healeys (NGK, Bosch, etc)?
>How do other numbering systems compare?

Don't know about these brands because I've always managed to get the correct
replacement when buying them but I do know that for Autolites the lower
the number the hotter the plug.

Roland


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