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Which risk increases when elevated cylinder wall temperature promotes fuel impingement?

A)Quench zone hydrocarbon emissions
B)Elevated exhaust turbocharger speeds
C)Reduced catalyst conversion efficiency
D)Decreased cylinder compression ratios

💡 Explanation

Quench zone emissions are increased by cylinder wall fuel impingement, because the fuel film incompletely combusts at lower temperatures due to incomplete mixing. Therefore, the hydrocarbon emissions increase, rather than being effectively combusted at higher wall temperatures.

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