What are the consequences of changing spark plug heat range from 6 to 7?

1 Answers
MacViolet
07/29/25 10:04am
There is a significant difference between spark plug heat range 6 and 7. Ranges 4-6 are medium heat values, while 7-9 belong to high heat values. Decreasing spark plug heat range: When reducing the spark plug heat range, incomplete combustion of the air-fuel mixture may occur, leading to perceived power loss. In severe cases, insufficient heat dissipation may cause the spark plug to overheat, potentially resulting in detonation. Increasing spark plug heat range: When increasing the spark plug heat range, the improved heat dissipation capability causes the spark plug to cool faster. This may lead to carbon buildup on the ignition tip, causing electrical leakage and preventing the spark plug from firing properly.
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