Some people think that high horsepower is high horsepower and high torque is high torque. In fact, both horsepower and torque have a certain numerical range, and the bigger the better. For example, our common car, with a horsepower of about 65,438+000 horses and a torque of about 250 Nm, is a very powerful model. There is no absolute ranking of power, horsepower and torque of a car, which needs to be decided according to the specific actual situation. We often see automobile manufacturers slogan "The greater the engine output torque, the greater the engine horsepower" to explain the maximum output torque produced by automobile engines, so it is normal that the horsepower is large and the torque is small, but of course this is not absolute. We can see that many cars use variable valve timing system to control engine output torque and maximum output power. So does the greater the displacement mean the greater the torque per unit mass of the car?

As we know, torque is also the most commonly used parameter, which is the unit mass torque of the car. Torque can be understood as power output per unit mass. And what we call automobile torque refers to the maximum output torque of the engine. That is to say, the horsepower we are talking about includes the amount of fuel consumed from the output of gasoline engine to the combustion in the engine cylinder. After obtaining gasoline from automobile engine, it needs to go through various physical reactions to produce power output, including the amount of fuel consumed from gasoline engine to in-cylinder combustion. What we often say about horsepower can also be understood as the power output per unit mass. For example, a car with a power of around 1 10 is a very strong model.

Let's first look at a set of data: unit mass torque (kg)= horsepower = 0.03kW) ×100% = 0.533 N m, where unit mass torque is displacement divided by horsepower (kg). As can be seen from the above data, the smaller the engine displacement, the greater the unit mass torque (kg). Of course, the torque per unit mass does not mean that the engine horsepower will be greater. Why? Because different car displacement corresponds to different unit mass torque. If the engine displacement is large, it means that the torque per unit mass (kg) is large. For example, when the automobile displacement 6 L is equal to 1 L, the smaller the displacement, the greater the horsepower.

Having said that, we know that the engine displacement and the torque corresponding to the displacement of different cars are different. Generally speaking, although there is a certain correlation between the engine torque and the maximum torque of the vehicle, it is not entirely certain what kind of relationship they are. For example, under the same displacement and load, the maximum output torque of a car with 80 horsepower and a rotation speed of more than 3,000 rpm is actually between1000-2,500 rpm. So for a car with 1.200 horsepower, the displacement is not too high, but under the same load, the speed is relatively high. For example, cars or off-road vehicles that mainly use domestic performance cars will have smaller torque per unit mass. That is to say, for the same gasoline engine (maximum output horsepower), the greater the power, the worse the engine performance. At the same time, because the unit mass speed of gasoline engine is much higher than that of diesel engine, the engine efficiency will be poor at low speed. Therefore, for a car with only 1 10 horsepower and a displacement of less than 500 rpm, its unit mass rotation speed is much higher than that of a diesel vehicle, and the gasoline power parameters are also much higher, without losing efficiency and sufficient torque.