Spark plug overheating issue

Spark plugs have different heat ratings, but have car owners ever thought about what happens if they choose the wrong one? 🤔 This time, let’s talk about the spark plug overheating phenomenon 🔥 (>800℃). The main reason for spark plug overheating is selecting a spark plug with a too low (hot) heat rating*. Overheating can lead to rapid wear 🩹 of the electrodes, and may cause pre-ignition 🎇, where combustion occurs before the spark plug’s ignition timing, significantly increasing cylinder temperature and pressure, ultimately potentially causing severe engine damage ⚙️! When inspecting overheated or pre-ignition spark plugs, you can often find traces of melting on the ceramic insulator surface and electrode head.

We should choose a spark plug with the appropriate heat rating to work at the ideal temperature ✔️, delivering peak performance 📈.

Spark plug operating temperature chart 🌡️

The two bar charts represent selecting an “✔️ incorrect” and “❌ correct” spark plug. The first bar shows the maximum operating temperature of 800℃, the third bar shows the minimum operating temperature of 450℃, and the middle bar represents the temperature of the spark plug we choose 👉.

If the spark plug temperature exceeds the first bar, the overheating issues mentioned above will occur. (Chart 1)
We should choose a spark plug with the appropriate heat rating to work at the ideal temperature, delivering peak performance. (Chart 2)

⚠️ Overheating can be caused by the following:
- Spark plug heat rating too hot (low)
- Prolonged aggressive / high-RPM driving
- Fuel octane rating too low
- Air/fuel mixture too lean
- Excessive combustion chamber deposits
- Insufficient engine cooling or lubrication

*Based on NGK spark plug heat rating labeling method

Max. Temp 800℃

Overheated - Pre-Ignition

Min. Temp 450℃

🡄 Spark plug temperature overheated 🡆

Max. Temp 800℃

Good Performance

Min. Temp 450℃

🡄 Spark plug temperature normal 🡆

NGK Spark Plugs

View more NGK spark plugs: Click here

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Spark plug overheating issue