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← TechnologyWhich consequence occurs when excessive cylinder pressure overcomes boundary lubrication in a piston?
A)Piston ring micro-welding occurs✓
B)Increased valve float oscillation
C)Catalytic converter poisoning begins
D)Crankshaft journal hardening ceases
💡 Explanation
Piston ring micro-welding arises from asperity contact leading to adhesion because when boundary lubrication fails, direct metallic contact results in intense heat and localized welding; therefore, rings weld, rather than simply scoring, because pressures overcome the oil film, promoting adhesion.
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