Common engine numbers typically range between 7 to 8 digits. The sequence and content of engine numbers vary among different manufacturers. Generally, they include the engine model, production date, and a randomly assigned serial number given when the engine comes off the production line. Some may also include a production location code. Engine models are identification codes assigned by engine manufacturers in accordance with relevant regulations, corporate or industry practices, and engine attributes. These codes represent information such as the manufacturer, specifications, performance, features, technology, purpose, and production batch of the engine, including fuel type, number of cylinders, displacement, and static braking power. Engines installed in passenger cars or multi-purpose vehicles are required to display the professional manufacturer, 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 specifications and size of the engine within the manufacturer's product line, and multiple engines can share the same model. The engine number, however, refers to the production serial number, which is unique to each individual engine. Structure of a Vehicle Engine Number: Front Section: Includes product series codes, generation symbols, and regional or corporate codes. Manufacturers may choose appropriate letters as needed, but these must be approved and recorded by the industry standardization body. Middle Section: Consists of symbols for the number of cylinders, cylinder arrangement, stroke, and cylinder diameter. Rear Section: Comprises symbols for structural features and usage characteristics. End Section: Distinguishing symbols. When differentiation is required due to improvements or other reasons within the same product series, manufacturers may select appropriate symbols. The rear and end sections may be separated by a hyphen (-).
