Cc is the engine capacity measured for every vehicle that works on an engine. Cc is measured in cubic centimeters while horsepower is measured in Kilowatt.
Horsepower is more important as it is used to signify the speed of a vehicle while cc is just used for indicating the physical dimension of the automobile engine.
So, now, tractor engines are expected to produce high torque at relatively low RPM's. In contrast to Cars, that need high HP for speed, Tractor engines generally don't care how big or heavy they are. Instead, they are built for heavy loads to work with.
Tractors are heavy vehicles; they need to pull a lot of resistance while working.
Hence power in the form of torque is needed in order to get more torque.
Rpm should be low, generally for tractors rpm for maximum torque is around 1500 and bhp is at 2250
Higher compression ratio is needed for the proper working of the engine.
More stroke length/stroke to bore ratio is greater than one of such engines are called under square engines.
Another reason is more piston and crank weight. The tractor system works with more torque and less power that is bhp.
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