Which phenomenon elevates detonation risk when lean burn engine compression ratio excessively increases?

💡 Explanation

When compression ratio increases, adiabatic compression raises temperature, causing fuel-air mixture autoignition before spark, leading to detonation. Therefore autoignition is the core mechanism, rather than heat transfer losses, reduced turbulence, or EGR variations, requiring different initial conditions.

• Which outcome occurs when a piezoelectric crystal accumulates excess charge at a specific resonant frequency?
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