Kubota L4701 CC vs. HP
I am trying to understand the relationship between the displacement and the power. Using a couple of models of the Kubota line, both the L4701 and the L6060 have a cylinder of 148CC. The L4701 has 47HP and the L6060 has 62HP. So, does this imply that the 148cc cylinder of L4701 is underutilized?
If you are buying a tractor, I would forget the CC specifications.
What you have to look at are the CVs. The CVs are the power and the speed with which the work can be done. The implements are typically classified by the horsepower they need to function, as well as hydraulic things.
All tractor manufacturers have long using the same central block (the same cc) in a wide range of powers. There is much more in the HP than in the CC’s. The adjustment of the pump of the injector and the turbo comes to mind. So instead of melting a whole series of different blocks for each HP tractor, they use them, and adhere / adjust them differently.
Pay more money for a more tune / adjusted tractor for more power. Or pay less than one that is not. You can say that the lower power is underutilized, but some can say that it will last longer when you do not try to overuse the block.
In any case, these tractors are classified for constant use. If the CCs of the tractors are compared with other engines, such as those of cars and trucks … HP per DC ….. The tractors do not even come close.
There are some engines that have both automotive and industrial applications. The two most occurred to me are the cummins diesel of 5.9l, and Ford 300 gasoline engines. Put them on a truck and can upload the CV because the demand for energy is intermittent. Put them in a generator or in a tractor and have to lower the power, otherwise, it will overheat.
Another thing you need a block that produces more power is a larger refrigeration system. If the 6060 has more power, it is very possible that you have more cooling capacity.
So no, the displacement is not “underutilized”, but the engine is imbalanced to make less power than it is capable. As LD1 said, this is common in the world of tractors for several decades. Personally, I prefer that a larger block produces less CV than the opposite, but in reality, there is probably no difference. All these engines are designed for continuous use and should have a very long life.