Why is Honda's engine so powerful? What is Honda's trick?

Previously, Bian Xiao wrote about VVT valve timing. Then, the rider asked Bian Xiao what VVL was and how it was different from VVT. All right! The editor tried his best to satisfy the passengers. I know that VVT means "timing" of valve opening and closing. For example, in the intake stroke, after the piston moves to the top of the cylinder in theory, the intake valve opens; Then, when the piston works to the bottom of the cylinder, the intake valve is closed. But in fact, due to the inertia of airflow, the opening and closing timing of intake valve is different from the theoretical value. There is a "phase difference". For example, after the piston moves to the bottom of the cylinder, the intake valve does not actually close, but closes after a certain delay, so as to maximize the use of intake inertia to increase the intake air volume. VVL: Valve lift is variable. According to the change of engine speed and intake flow, the opening and closing timing of the valve can be adjusted in real time. This is the simplest principle expression of VVT mentioned above. So what is VVL? In fact, VVL means "variable valve lift" in Chinese. The word "variable valve lift" sounds like an academic statement, but in other words, the way the valve opens is variable. How to understand? Let me give you a simple metaphor. Is your faucet the same as yours, the biggest one is only half open? Has the size of the water flow changed with it? -Yes! VL valve lift is such a truth! The valve is a little wide open, but only a little. This difference! The traditional engine valve is the largest when it is opened and completely closed when it is closed. The opening cannot be adjusted. VVL has this ability. Why do you need to adjust the valve lift? So, why do you need to adjust the opening and closing of the valve? In fact, everything is still because of the inhalation speed. It is understood that the faster the airflow speed of the intake air, the stronger the "airflow vortex" in the cylinder. When the engine speed is high, the intake air volume is large, the intake air flow is super high, and the "airflow vortex" in the cylinder is also strong, which is beneficial to combustion. However, if the engine speed is low, the intake itself will be less, the intake flow rate will be slower, the "airflow vortex" in the cylinder will be greatly weakened, the combustion effect will be worse, and the sufficiency of combustion will be reduced. In order to ensure better combustion effect, it is necessary to maintain a high intake flow at low engine speed. VL was born for this! If we usually wash the car by pipeline, sometimes the tap water pressure is not enough and the water coming out of the pipeline is very small, then if we pinch the pipeline by hand, the area of the pipeline will become smaller and the water flow will suddenly become steep. -Yes! The basic principle of VL is the same! When the engine speed is low, the intake air is not enough, so the valve is opened very little. In other words, it's like holding a nozzle in your hand. At this time, the intake air injected into the cylinder is "kicked off" and the "airflow vortex" in the cylinder is also maintained. Therefore, the VVL system can ensure that the engine can maintain a good combustion state in the cylinder at different speeds. According to the different English letters, it is not only the enterprise name of each enterprise, but also Honda is the first thing that car enthusiasts think of when it comes to variable valve lift VVL. Because I have heard of Honda's VTEC system. In fact, among the major automobile companies in the world, except Honda, Nissan of Japan and BMW of Germany all have patents on variable valve lift technology. They just use different business names. The principle is similar. In addition, technically, Nissan and BMW's valve VVL technology is more advanced than Honda's. About the specific technical differences between them, let's talk about it later. So much for today's knowledge.