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Last Updated: 8/17/2010
Disclaimer
| The fabrication, modifications and designs you see on this web site are completed by myself. If you duplicate these modifications you do so at your own risk. I do not endorse or make any claims to their safety, performance, On-road or off-road worthiness. Any "Product Reviews" are my sole and personal opinion. These reviews are on items purchased from or provided by reputable aftermarket suppliers. All registered trademarks belong to their respective owners. |
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With a new or unknown Spark Plug / Engine combination, play it safe!
Always start at least 1-2 heat ranges on the cold size of the mean heat-range for the series of plug you are running. At worst, you may experience some plug fouling. On the other hand, a plug that’s too hot can cause detonation and damage the engine.
Determining the optimum heat range is a trial-and-error process. You run the car, then “read” the plugs by closely inspecting and analyzing the condition of the plug tip and insulator. Once you find the correct heat range that prevents fouling without contributing to pre-ignition or detonation, changing to a hotter or colder plug won’t alter engine performance. Set up the engine for optimum air/fuel ratio and timing first, then fine-tune plug heat range. Reading plugs on the street is not the same as in racing. On the street, as mileage piled up, a properly burning plug traditionally had a clearly visible brown or grayish-tan color.
Today’s pump gas may use additives that cause a discoloration of the plug core nose; they could be pink, purple, or blue. Do not consider this coloration as an indication of heat range when reading spark plugs.
Having the proper plugs on hand for your application should ensure that your engine will get fired up with no gaps in its performance potential.
The below was from a free hand out issued by NGK Spark Plugs around 1977
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Oil Fouled
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Oil Fouled
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Carbon Fouled
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Too Cold
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Too Cold
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Cold or Rich - OK
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Cold or Rich - OK
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Cold or Rich - OK
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Good
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Good
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Good
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Good
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Real Good
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The Best
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Best
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Best
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Best
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Good
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Good
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Good
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Kinda Hot - OK
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Hot or Lean - OK
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Hot or Lean - OK
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Hot or Lean - OK
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Too Hot or Lean
Pre-Ignition Range
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Too Hot or Lean
Pre-Ignition Range
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Too Hot or Lean
Pre-Ignition Range
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Too Hot or Lean
Pre-Ignition Range
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Too Hot or Lean
Pre-Ignition Range
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