4hw.com.cn: I believe that nowadays many people will consider a question when they buy a car, that is, how much displacement is good for buying a car? Many people worry about buying a car with a small displacement. They don't have enough power when they turn on the air conditioner in summer. They worry about consuming fuel when they buy a car with a larger displacement. So how to choose the displacement of a car? Let's take a look at it with Xiaobian~
In fact, the power of the car is not enough, which is fundamentally a physical problem. If the car wants to move forward, it needs the driving force of the car to overcome its own resistance (the resistance is mainly composed of friction and air resistance). If the driving force is greater than the resistance, the car can run. The more the driving force is greater than the resistance, the stronger the power of the car is. This is just a popular explanation. The actual situation is complicated Many.
The driving force of the vehicle is generally provided by the engine. The two most common parameters that can judge the power of the engine are power and torque. But there is another parameter that can directly reflect the power of the car compared with the power. This parameter is: specific power, which refers to the ratio of the maximum power of the engine to the total mass of the car. Generally speaking, the greater the specific power of the same model, the better the power performance of the car.
Another engine parameter that affects the power of the vehicle is torque. The torque output curve (the speed range of the maximum torque) usually determines the acceleration ability of the vehicle. For example, for the 1.2t turbocharged engine and 1.6L self-priming engine with similar power and torque, the 1.6L self-priming engine can only output the maximum torque at about 4000 rpm, while the 1.2t turbocharged engine can output the maximum torque at 1800 rpm, and it lasts until 3800 rpm. The turbocharged engine with similar torque comes earlier than the maximum torque of the self-priming engine, and the duration is longer, So the same model uses turbocharged engine to drive more vigorously! There are many factors that affect the actual power of the car, such as the gear ratio of the gearbox.
How much displacement is enough for a home car?
Generally, the empty weight of compact household cars is less than 1.3t, plus 5 people with full load and air conditioning in summer. Theoretically, the maximum engine power is greater than 75kW, and the empty car specific power is greater than 57kw / T. The compact family cars on the market are basically equipped with 1.5L and 1.6L engines, and the power of these engines is more than 75kW, which is sufficient in theory.
Enough often represents meeting the most basic needs, such as the 1.5L version of Mazda oncella. The power household is enough, but if you want to drive faster and have more fun, the 2.0L version is more suitable. A word summary of compact family car: don't worry about buying 1.6L, the power is enough; money is rich, power requirements are high, don't worry about the same car with larger displacement or turbocharged engine model is your dish!