20 10 new lacrosse 2.0T or 2.4L, which is better? Please elaborate.

Of course, it is 2.0T Of course, small displacement has the performance of large displacement, and fuel consumption is also saved.

The English name of turbocharging is Turbo. Generally speaking, if we see Turbo or T at the rear of a car, it means that the engine used in this car is a turbocharged engine. I believe you have seen many such models on the road, such as Audi A6 1.8T, Passat 1.8T, Bora 1.8T and so on.

Turbocharging kit

The main function of turbocharging is to increase the air intake of the engine, thus improving the power and torque of the engine and making the car more dynamic. After the engine is equipped with turbocharger, its maximum power can be increased by 40% or even higher than that without turbocharger. This means that the same engine can generate more power after being supercharged. Take our most common 1.8T turbocharged engine as an example. After supercharging, the power can reach the level of 2.4L engine, but the fuel consumption is not much higher than that of 1.8 engine. Another level is to improve fuel economy and reduce exhaust emissions.

However, the pressure and temperature of the supercharged engine are greatly increased, so the life of the engine will be shorter than that of the engine with the same displacement, and the mechanical performance and lubrication performance will be affected, which also limits the application of turbocharging technology in the engine to some extent.

Third, the types of engine pressurization

[Edit this paragraph]

1. Mechanical supercharging system: This device is installed on the engine and connected with the crankshaft of the engine through a belt. It gets power from the output shaft of the engine and drives the rotor of the supercharger to rotate, thus blowing the supercharged air into the intake manifold. Its advantage is that the turbine speed is the same as the engine speed, so there is no lag phenomenon and the power output is very smooth. But because it is installed in the rotating shaft of the engine, it still consumes some power, and the effect of supercharging is not high.

2. Air wave pressurization system: air is compressed by pulse air wave of high-pressure waste gas. This system has good supercharging performance and acceleration performance, but the whole device is huge and not suitable for installation in small cars.

3. Exhaust gas turbocharging system: This is the most common turbocharging device in our daily life. The turbocharger has no mechanical connection with the engine, but is actually an air compressor, which increases the intake air by compressing air. It uses the inertia impulse of the exhaust gas discharged by the engine to push the turbine in the turbine chamber, and the turbine drives the coaxial impeller, which pressurizes the air sent by the air cleaner pipeline and sends it to the cylinder. When the engine speed increases, the exhaust speed and the wheel speed also increase synchronously, and the impeller compresses more air into the cylinder. With the increase of air pressure and density, more fuel can be burned, and accordingly, the output power of the engine can be increased by increasing the fuel quantity. Generally speaking, after installing the exhaust gas turbocharger, the engine power and torque will be increased by 20%-30%. However, exhaust gas turbocharging technology also has its own points that must be paid attention to, that is, the pump wheel and turbine are connected by a shaft, that is, the rotor. The exhaust gas from the engine drives the pump wheel, which drives the turbine to rotate, and the turbine rotates to pressurize the air intake system. The supercharger is installed on the exhaust side of the engine, so the working temperature of the supercharger is very high, and the rotating speed of the supercharger rotor is very high, which can reach hundreds of thousands of revolutions per minute. Such a high speed and temperature make the ordinary mechanical needle roller or ball bearing unable to work for the rotor, so the turbocharger generally adopts full floating bearing, which is lubricated by oil and cooled by coolant.

4. Compound supercharging system: that is, exhaust gas turbocharging and mechanical supercharging are used together. This device is widely used in high-power diesel engines, with high engine output power, low fuel consumption rate and low noise, but its structure is too complicated, its technical content is high, and it is difficult to maintain and popularize.