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← TechnologyWhich consequence results when valve timing fails in an engine?
A)Piston-valve collision risk rises sharply✓
B)Engine knock reduces catastrophically
C)Oil viscosity increases instantaneously rises
D)Exhaust temperature decreases significantly
💡 Explanation
Piston-valve collision risk increases because improper valve timing alters the Intake-Compression-Power-Exhaust (ICPE) cycle, causing asynchronous movement. Therefore, impact is likely rather than simultaneous valve opening and piston clearance, with correct timing.
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