Which risk increases when an internal combustion engine crankshaft operates at higher rotational speeds but with insufficient lubrication?

💡 Explanation

When a crankshaft operates at high speeds with inadequate lubrication, metal-to-metal contact leads to increased cyclic stress because the oil film cannot adequately separate the surfaces, initiating micro-cracks and eventually leading to fatigue failure. Therefore fatigue failure results, rather than detonation, oxidation or creep, which occur through entirely different phenomena.

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