How Many Digits Are in an Engine Number?

1 Answers
StElliott
07/29/25 5:37pm
Common engine numbers typically consist of 7-8 digits. The sequencing and content of engine numbers may 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 place-of-origin code. Engine models are identification codes assigned by manufacturers in accordance with 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, among others. Engines installed in passenger cars or multipurpose passenger vehicles are required to display the professional manufacturer, model, and production number as per regulations. It's 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, is the production serial number of the engine, with each engine having a unique number. Composition of a Vehicle Engine Number: Prefix: Includes product series code, generation symbol, and regional or corporate code. Manufacturers may choose appropriate letters as needed, subject to approval and filing by the industry standard regulatory body. Middle Section: Consists of symbols for the number of cylinders, cylinder arrangement type, stroke, and cylinder diameter. Suffix: Comprises symbols for structural features and intended use. Tail: Distinguishing symbol. When differentiation is required due to improvements or other reasons within the same product series, manufacturers may select appropriate symbols. The suffix and tail may be separated by a hyphen (-).
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