A complete engine number typically consists of 7-8 digits. The engine number is usually found on the outer surface of the engine block, or on the vehicle's nameplate, the engine compartment nameplate, or the car purchase invoice. The engine number can also be found on the vehicle's factory certificate, the operation certificate of commercial vehicles, the vehicle purchase tax payment certificate, the registration record with public security authorities, or the vehicle insurance card. The simplest and most direct method is to check the vehicle registration book or the vehicle's driving license. Engine numbers are like a person's ID number, representing each vehicle. They store very important information about the vehicle. The engine model is an identification code assigned by the engine manufacturer in accordance with relevant regulations, industry or enterprise practices, and the attributes of the engine. It is used to indicate the manufacturer, specifications, performance, features, technology, purpose, and batch of the engine, such as fuel type, number of cylinders, displacement, and static braking power. Engines installed in cars or multi-purpose passenger vehicles are required to display the professional manufacturer's name, model, and production number. It is important to note that the engine number is not the same as the engine model. The engine model refers to the specification and size of the engine within the manufacturer's product line, and engine models can be the same. The engine number, however, refers to the production number of the engine, with each engine having a unique number that cannot be duplicated. Composition of a vehicle engine number: Front part: Includes product series code, generation symbol, and regional or enterprise code. Manufacturers can choose corresponding letters as needed, but they must be approved and filed by the industry standard regulatory body. Middle part: Consists of symbols for the number of cylinders, cylinder arrangement, stroke, and cylinder diameter. Rear part: Comprises symbols for structural features and usage characteristics. Tail part: Distinguishing symbol. When differentiation is needed due to improvements or other reasons within the same product series, manufacturers can choose appropriate symbols to represent this. The rear and tail parts can be separated by a hyphen.
