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What is the problem if the temperature of the oil and heads of cylinders is too high? What's the fault in piston engines?

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  • $\begingroup$ Had anyone mention kaboommm!!!!?! $\endgroup$
    – vasin1987
    Sep 3, 2020 at 20:07
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    $\begingroup$ Engines contain explosions. Metal gets weak when too hot. End result? $\endgroup$
    – DKNguyen
    Sep 5, 2020 at 2:22
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    $\begingroup$ Your edit changed the meaning of your question, invalidating the (good) answers you received. As originally stated, the question seemed to ask about the bad effects of high temperatures; now it asks about causes. Might be best to revert your edit & ask a new question about causes. $\endgroup$
    – Ralph J ♦
    Sep 5, 2020 at 9:15

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Piston engines are designed to run within specific temperature ranges. Going above this range might effect the lubrication [hot oil may not provide the right amount of protection to moving parts, If hot enough it could melt seals, or even catch fire.] the other danger is as metal changes temperature its structural property's change. If a metal gets too hot it becomes softer and may become less resistance to forces. also there is the issue of shock cooling, if a hot engine gets cooled to quickly, it may unevenly cool, and due to the difference in heat expansion could crack or fail.

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