Why is the horsepower of big trucks so low?

Big trucks have low horsepower? How big do you mean? Heavy truck or large harvester? At present, heavy trucks are all around 500 horsepower, some can reach 750 horsepower, and large harvesters can reach more than 3000 horsepower. Why don't you tell me the reason for the low horsepower?

Because the truck doesn't need to drive so fast, and it doesn't need too much horsepower. If you want a truck with a total weight of about 50 tons and a length of about 20 meters, if it can also run at a speed of 200 kilometers, ask if you are afraid, and ask other traffic participants and vehicles if they are afraid. In addition, diesel engines are characterized by small power and large torque, especially small torque. At present, the most common diesel engine for trucks is upgraded from 13. The power is generally between 440 and 580, and the torque is between 2100 and 2600. At least 50% of the torque can be generated at an idle speed above 500 rpm, and the maximum torque can be generated at 1000 rpm and maintained at 1300 rpm or 1400 rpm. At present, diesel engines with 13 liters or more have been put into the market one after another. Dongkang 14 liter, Wei Chai 15 liter, Yuchai 15 liter, Xikang 15 liter, Jiefang 15 liter and so on. Their horsepower is generally 600-750. If equipped with a 15 liter diesel engine with 3200 nm and 750 HP, the vehicle weight is 50 tons, and 4% can maintain a speed of over 60 and 30 kilometers per hour. Note that a slope of 4% is a steep slope in expressway design.

Big trucks have low horsepower? 500 horsepower trucks can be seen everywhere, and 700 horsepower tractors can be seen everywhere. Do you think the horsepower is still low?