Which outcome occurs when compression ratio is excessively increased during fuel injection engine design?

💡 Explanation

When compression ratio increases excessively, increased temperatures can cause auto-ignition before the spark plug, leading to engine knock from uncontrolled combustion. The higher temperatures from very-high compression increase the risk of pre-ignition reducing engine efficiency and causing potential damage. Therefore engine knock is the outcome, rather than cooler valves, better vaporization, or less carbon deposits, since those each imply alternative operating changes.

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