Which risk increases when a gasoline direct injection engine accumulates carbon deposits on piston crowns?

💡 Explanation

When carbon deposits form on piston crowns, hot spots develop because carbon insulates the piston material, retaining heat and increasing the risk of uncontrolled pre-ignition of the air-fuel mixture during compression; therefore increased pre-ignition risk results, rather than efficiency loss, oil dilution or higher NOx emissions, which stem from different causes.

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