Reading ngk spark plugs
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Reading ngk spark plugs

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    Senior Member Flat Fan's Avatar
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    Default Reading ngk spark plugs

    What is the best way to read a ngk spark plug. I've been reading a few popular articles and each one is different. Thanks

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    Some guy obnoxious001's Avatar
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    People use different methods. The ground strap helps determine if the heat range is correct. Some people read mixture by how many threads have changed color, others look for the ring at the bottom of the porcelain.

    One of these is cheap and handy to have in the toolbox Diagnostic Penlight Otoscope Pen Style Light for Ear Nose Throat Clinical Tool | eBay

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    Senior Member Flat Fan's Avatar
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    Quote Originally Posted by obnoxious001 View Post
    People use different methods. The ground strap helps determine if the heat range is correct. Some people read mixture by how many threads have changed color, others look for the ring at the bottom of the porcelain.

    One of these is cheap and handy to have in the toolbox Diagnostic Penlight Otoscope Pen Style Light for Ear Nose Throat Clinical Tool | eBay
    Thanks for the response. My buddy was trying to show me how many threads changed color, but I don't really see it clear because of idling back to the out ramp. Would you have a clear picture on hand that shows the color changing. Thanks

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    Senior Member wizbang's Avatar
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    What fuel are you tuning ?

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    Senior Member jockorace's Avatar
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    An old school drag racer....Roy Cavalieri, schooled me on reading plugs. The brand is irrelevant. Read the ring on the inner porcelain. However, you're wasting your time if you attempt to read them after ANY idling. You shouldn't be doing it at the races, since they would frown on you killing the power and coasting down after a pass. Do a test/tune day on a weekday at a lake with no distractions. Good luck! Jocko

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    Ain't Right Racin piston in the wind's Avatar
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    QE 2050 W/ a Junk ass screw blower

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    steelcomp was here
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    Quote Originally Posted by piston in the wind View Post
    Best description I've ever read.
    If God is your co-pilot, change seats!
    Acts 2:38, the perfect answer to the perfect question.

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    Quote Originally Posted by scott foxwell View Post
    Best description I've ever read.

    DITTO! Jocko

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    I have to agree with JOCKORACE about idling back, it will be a waste of time.
    What you would be reading is what was taking place while it was idling and not during the run.

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    Village Idiot fc-Pilot's Avatar
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    That is a pretty darn good explanation. The one issue that I run into is NA methanol drag application. The color at the bottom of the porcelain does not color like gas does. E85 often needs multiple runs to get a decent "ring" down there to get a good reading.

    The one thing I will say is the better the otoscope the better. I have two, one is similar to the one Barry posted and the other is a medical grade otoscope. I keep my pocket one in my "lake" toolbox and my other in my shop toolbox (as that is right by the dyno). When running an untested engine at the strip or lake I take my good one with me. Otherwise my little cheap one does a decent job.

    Paul

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    Senior Member wizbang's Avatar
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    Mike Canter is on ITA, he will answer any questions you have and will help you , he is a great guy and a wealth of info !

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    Senior Member Flat Fan's Avatar
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    I'm running vp 110. That's my problem I don't want to shut down on the race course. That is one of the articles I read, and then I read another and it was opposite of that one. Thanks for the responses.

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    Senior Member wizbang's Avatar
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    Alcohol vs. gas !

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    gas,after you idle in pull plug spray with brake clean, it will still be a little dirty but you can still see the ring ...

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