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← ScienceWhich outcome occurs when an exhaust valve sticks open in a high-performance internal combustion engine?
A)Reduced brake horsepower and thermal efficiency✓
B)Increased valve overlap and scavenging flow
C)Enhanced cylinder pressure during intake
D)Optimal air-fuel mixture within manifold
💡 Explanation
Reduced brake horsepower and fuel efficiency results because increased backpressure acts against the piston’s work during other strokes; rather than enhancing cylinder dynamics, incomplete combustion reduces power due to compression inefficiency.
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