In a diesel engine, which outcome increases with excessive fuel injected per cycle against a given cylinder's piston?

💡 Explanation

Increased unburnt fuel results, activating the Leidenfrost effect which delays proper combustion which elevates exhaust temperatures due to post-combustion. Thermal fatigue risk rises with elevated exhaust valve seat temperatures, because the Leidenfrost effect, therefore it accelerates the metal's weakening, rather than better emissions with efficiency improvements.

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