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← ScienceWhich outcome is caused by exceeding designed compression ratio limits within a gasoline engine cylinder?
A)Detonation due to autoignition✓
B)Valve float due to resonance
C)Lean misfire from mixture stratification
D)Pre-ignition due to hot spots
💡 Explanation
When the compression ratio in a gasoline engine exceeds the designed limit, the air-fuel mixture can autoignite before the spark plug fires due to excessive pressure and temperature, causing detonation. Therefore detonation occurs, rather than valve float, lean misfire or pre-ignition, which each require separate mechanisms.
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