Engine torque refers to the torque output from the crankshaft end of the engine. Under the condition of fixed power, it is inversely proportional to the engine speed, the faster the speed, the smaller the torque, and the greater the vice versa, which reflects the load capacity of the car in a certain range.

The definition of torque is the torque output from the crankshaft end of the engine, the unit is Nm, the torque can be understood to make the object rotation effect, this effect is related to two factors, one is the force, one is the moment arm, the greater the force or the longer the moment arm, the better the rotation effect will be, combined with the figure above is also well understood, that is, the greater the force at the connection or the longer the R, the torque will also be large. For example, in life, it is like using a wrench to screw, the greater the force or the longer the wrench, the easier it will be to screw up, the easier and faster the screw is two concepts, the difference in speed.

In some cases, it can truly reflect the "true color" of the car, such as when starting or driving in the mountains, the higher the torque, the better the response of the car. Compared with cars with the same type of engine, the larger the torque output, the larger the carrying capacity, the better the acceleration performance, the stronger the climbing force, the fewer times of shifting, and the relatively less wear and tear on the car. Especially when the car starts at zero speed, it shows the advantage of high torque and fast lifting speed.

Torque, like power, is one of the main indices of a car engine, which is reflected in the performance of the car, including acceleration, climbing ability, etc. Its exact definition is the cross product (M) of the position vector (L) and the force (F), which in physics means that the force of the object rotating is multiplied by the distance to the rotating shaft, and it can represent the force output by the engine (because the radius of the crankshaft in the engine is certain). Generally speaking, torque is an important standard to measure the quality of a car engine, and the size of a car's torque is proportional to the power of the engine.

For the family car, the higher the torque, the better the acceleration; For off-road vehicles, the higher the torque, the higher the slope; For a truck, the greater the torque, the greater the weight of the truck. The greater the torque of the car, the better, and the same is true when driving, in the case of the same displacement, the greater the torque, the better the engine. When driving, you will feel that the car does what you want, you can accelerate if you want to accelerate, and the "back feeling" is very good. Torque is one of the main parameters to evaluate the performance of a car. There is an important data to evaluate a car, that is, the acceleration time of the car at 0-100 km/h. This acceleration time depends on the torque of the car engine.

Generally speaking, the highest index of torque can be reached at a relatively low engine speed, which indicates that the engine process of this car is good and the strength is good. Some cars reach the highest index of torque at around 5000r/min, which indicates that "power" is not the strength of the car. It can be said that the driving pleasure we pursue mainly comes from torque, which is the so-called "push-back sense". If the maximum torque of a car's engine appears in the speed range we often use, then such a car can definitely bring you extraordinary driving pleasure. For family cars, the perfect engine maximum torque should occur at very low speeds, and the maximum power should occur at relatively high speeds.

So what is the practical significance of torque? The torque output of the crankshaft end will eventually be transmitted to the tire through the gear, making the tire rotate, then the torque on the tire divided by the radius of the tire, it is concluded that the size of the force driving the tire forward, the radius is fixed, the greater the torque, the greater the force applied, according to the formula F=ma, the greater the force, the mass is unchanged, the greater the acceleration naturally, so the car with large torque, General acceleration performance will be better, acceleration refers to the speed of change, rather than the speed of slow, this point to understand, of course, this is mainly for the first half.

The maximum torque determines the acceleration performance of the car, especially at low speed. The torque output of the engine from the crankshaft end is expressed by N·m/r/min. The maximum torque generally appears in the range of the engine's medium speed, and the torque decreases with the increase of the speed. We generally drive the engine in the urban area at 2000~3500 RPM, which means that the peak torque appears within 4000 RPM engine is the most suitable.

Under the condition of fixed power, it is inversely proportional to the engine speed, the faster the speed, the smaller the torque, and the greater the vice versa, which reflects the load capacity of the car in a certain range. The torque of the engine is related to the adjustment of the engine, including the intake system, the fuel supply system and the ignition system. But in fact the biggest relationship is the displacement of the engine and the size of the piston stroke.