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Obviously, this is different with every truck, as there are many different sizes and makers of the engines that are used in semi trucks.

The lower end of the scale, used in small or older semi trucks and straight trucks, would be around 275-300 horsepower. The upper end of the scale, as in large new over-the-road semi trucks, would be around 500-600 horsepower maximum.

The average semi truck you see every day on the road or around town would probably be right around 400-450 horsepower.

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14y ago
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16y ago

Usually around 200-400HP. Horsepower can basically be imagined as how fast the engine is running, while torque is the actual rotational force. The trucks have big engines, which means they run slow. A typical semi engine may only run up to 2,500RPM, which means low relative horsepower. Rather, they produce a lot of torque. That 250HP semi may be putting down upwards of 1,000 ft-lbf of torque. Compare that to a Honda Civic 155HP / 139ft-lbf [K203Z].

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9y ago

It's actually more like 400 - 650 horsepower. 400 - 500 is typical, with a torque rating of 1600 - 1800 lbs/ft of torque.

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Q: What is the average horsepower of a semi engine?
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