Like, you see cars like ferrari making absurd power figures with small block engines, like a 4 liter making 800hp. Is it just a cost thing that they would rather use a 10 liter? It makes the same power, and thanks to the transmission it’ll get the same torque at the wheel.
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The higher the revs, the lower the lifetime and reliability of an engine. Trucks are generally large enough to fit large engines – so there isn’t any incentive to get light, small and high power. More important are high torque (to pull heavy loads) and high reliability (ie less maintenance dollars per mile).
High rev engines are difficult to maintain – truckers do not want to spend time in a service shop. Larger engines tend to be simpler and much quicker to repair at much less cost. Given that a truck will have to weigh many tons anyway, adding a few hundred pounds of engine isn’t a big deal.
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