What about the size of a large tractor engine
It is the engine's displacement, which is the volume of the work that the piston moves from the top to the bottom. If the engine has multiple cylinders, the combined volume of all cylinders is called engine displacement. It's usually expressed in liters. Engine displacement is one of the most important structure parameters, it is more than the cylinder diameter and number of cylinders can represent the size of the engine, the engine of many indexes are closely related with the displacement.
The size of the discharge directly affects the power and fuel consumption of the tractor You can refer to the emission or engine displacement items in baidu baike
A large tractor has six cylinders with four cylinders, so the displacement is about the size