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If you know the torque and the rpm, you can calculate the HP based on the formula. HP= Torque x RPM / 5252. So if you have the torque curve for an engine you really have the power description for that engine. I don't know why torque at a low rpm would stress an engine more than the same torque at a high rpm. It's both force applied with a moment arm, and independent of rpm. Diesel engines are beefy because the compression ratio has to be really high.
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