[Healeys] Spark plug color - what do you think

John Spaur jmsdarch at sbcglobal.net
Sun Apr 26 10:19:02 MDT 2015

Hi Larry,


This is a link to the color chart I used. I think my plug color is close to
#14. http://hpibajass.com/spark-plug-color/


The carbon marks could be left over from the oil I used on the threads when
I installed the plugs. I am curious about that too.  There is some carbon
build up on the tops of the pistons but I don't think there is much; it is
hard to tell. When I was first tuning the car it was on the rich side; that
might account for the carbon marks too.


I am using Chevron with Techron because it is close to my house. 92 octane
(R+M)/2. It is California winter or summer blend depending on the time of
the year.



John Spaur

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