Quote:
Originally Posted by Schroeder
Because it's a huge engine with huge pistons that would put a lot of stress on engine components if they revved higher. It's the same why V8 muscle cars do not rev as high as 4 or 6 cylinder sport cars. In general you can say the bigger the engine the lower the rpm.
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Very general observation. Many factors involved though. Torque is the major player with diesel engines. Chevy 302 V8 are capable of 12,000 rpm. They produce a mad amount of horse power and torque. The diesel generates an incredible amount of torque at low rotations. The weakest link for high torque engines is the transmission, drive shaft and rear axle that can twist like a pretzel under load. For the tractor, having a slew of gears produce a powerful pulling vehicle that is capable of good speeds as you work through the gears.