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Typically a big diesel truck engine makes a huge torque with a relatively moderate bhp output, while a small race engine develops a lot of horsepower but, conversely, a modest torque.
Is it the volume of the engine? Gear ratings? Density/weight of different engine components? Other things?
Yes, torque is proportional to displacement, about 80 ft/lbs per liter N/A tops. Horsepower is just an abstraction, it is not measured, it is calculated by multiplying by rpm. That is how a 2.4 ltr F1 engine can have 800 hp. When you multiply by 18,000, things happen. Peak torque in an engine occurs at the VE peak, when the engine inhales the highest percentage of its displacement. Raise the VE, the peak torque rpm goes up, the calculated horsepower goes up
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Paul
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