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Originally Posted by curtis73
It would have to occur at 5250 rpm for HP and torque. Torque is always higher below 5250, and HP is always higher above 5250. Its a mathematical thing that has nothing to do with engine parameters. Define which efficiency you mean: thermal efficiency, volumetric efficiency, frictional efficiency, mileage?
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if the torque drops rapidly after peaking at any RPM, the HP peak would be there also
Its not very desirable IMO, to seak out such a situation. Easiest way would be to limit the RPM so that the torque curve doesn't peak until it hits the rev limiter. On a NA engine, this would require a really big cam(s), or a really big turbo, neutering the lower RPM as much as possible
But he didn't ask if it was an intelligent thing to seak, only how to accomplish it.