What does the engine type approval number mean?

[LaZachary]

It is the code on the vehicle type approval certificate. Below are the relevant explanations: 1. The first digit code: CN stands for China. 2. The second digit code: ZC is the code for compression ignition engines (mostly diesel engines), while QQ corresponds to spark ignition engines using gaseous fuels (ordinary gasoline engines). There are also very few CJ codes, followed by the third and fourth digit codes, and then a series of numerical values. 3. Advantages: The biggest advantage of a turbocharger is that it can significantly increase the engine's power and torque without increasing the engine displacement. Generally, the power and torque of an engine equipped with a turbocharger can increase by 20%-30%.