Which risk increases when elevated exhaust gas temperatures continuously impinge directly a spark-ignition engine piston crown?

💡 Explanation

When exhaust gas temperature is excessively high impinging a piston crown, persistent localized heating occurs because of reduced heat transfer, promoting auto-ignition of the air-fuel mixture before the spark, hence: pre-ignition. Therefore hot spot formation results, rather than detonation, oil consumption, or knocking, each driven by dissimilar processes.

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