[Healeys] Spark plug color - what do you think

Larry Varley varley at cosmos.net.au
Mon Apr 27 05:40:05 MDT 2015

Hi John, it looks like 23 in the photos, but photos can do that so 
perhaps its all ok. You probably just need to tune your camera :) There 
will always be carbon on the pistons I would not worry about that. It 
sounds like your using the right fuel, I think that matches 98 fuel 
here, so if your getting no or very little pinging, your probably fine.
Larry Varley

On 27/04/2015 2:19 AM, John Spaur wrote:
> 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.
> **
> Cheers,
> John Spaur
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