Which risk increases in an internal combustion engine when a piston's top ring loses tension?

💡 Explanation

When a piston ring loses tension, the sealing effectiveness decreases because combustion gasses leak past the piston into the crankcase – known as blow-by -- increasing the crankcase pressure. Therefore, increased crankcase pressure and blow-by results, rather than alternatives which stem from ignition timing, valve dynamics, brakes, respectively.

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