Which risk increases when direct injection gasoline engine compression ratio exceeds limits?

💡 Explanation

When compression exceeds limits, higher temperatures result because compressing the gasses increases their thermal energy leading to pre-ignition (knocking) as combustion gasses prematurely ignite the fuel-air mixture. Therefore pre-ignition results, rather than other failure modes such as bearing wear, converter failure, or fuel pump damage which originate from different conditions.

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