Which outcome occurs when rapid thermal cycling causes piston erosion in a direct injection engine?

A)Increased blow-by and oil consumption✓

B)Enhanced combustion and lower emissions

C)Reduced knocking and improved efficiency

D)Decreased wear on connecting rods

💡 Explanation

Increased blow-by and oil consumption result from scoring through thermal fatigue initiating crack propagation; crack propagation leads to material detachment via the Paris Law of Fatigue because the cyclic thermal stress range near the piston crown exceeds the threshold; therefore gases leak past the piston rings, rather than creating improved combustion.

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Which outcome occurs when rapid thermal cycling causes piston erosion in a direct injection engine?

💡 Explanation

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