Reading spark plugs

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Reading spark plugs

Post  jones on March 5th 2015, 6:07 pm

I need to learn how to read spark plugs. Being that I am the owner of a 700ish hp engine and plan on running nitrous down the road.

All I currently know is if a plug is black it's rich, light brown it's good, new looking or missing the strap it's lean. What is the best way to learn? I want to learn about how to read timing, heat range and there is something about looking at the base of the ceramic I know nothing about. What is the best way to learn without someone that knows showing me in person?

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Re: Reading spark plugs

Post  maverick on March 5th 2015, 6:24 pm

Check out dragstuff.com They have a page just for you.
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Re: Reading spark plugs

Post  jones on March 5th 2015, 7:14 pm

http://www.dragstuff.com/techarticles/

For later reference.

See, I had always judged the color at the tip electrode and not the base. I did know that in order to get a good reading you needed to kill the engine  as soon as possible.

Question, if you have the engine tuned for one heat range and you determine you want to go to a hotter plug rather than add timing will that change your color and have to re-adjust your fuel?

Is the spark plug reading kits worth purchasing or most people just buy a magnifying glass?

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Re: Reading spark plugs

Post  maverick on March 5th 2015, 7:40 pm

A cheap jeweler's loupe works well. You can find a zillion of 'em on Amazon.
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Re: Reading spark plugs

Post  bruno on March 5th 2015, 10:19 pm

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Re: Reading spark plugs

Post  jones on March 6th 2015, 12:23 am


Thats a exact copy of what was posted on the first site. Thats why SJ called him a "parrot".

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