What do the numbers and symbols on the engine mean?

[DiSienna]

The numbers and symbols on the engine indicate information such as the number of cylinders and the structure of the engine. Meaning of engine symbols: Front part: Represents the product series symbol and generation indicator symbol, which are designated by the manufacturer using appropriate letters as needed, subject to approval by relevant authorities; Middle part: Consists of symbols for the number of cylinders, stroke type, cylinder arrangement, and cylinder diameter; Rear part: Structural and usage characteristic symbols, represented by letters; Tail part: Differentiation symbol. When differentiation is required within the same product series due to improvements or other reasons, the manufacturer selects appropriate symbols. Meaning of numerical symbols: Common Arabic numerals include 4, 5, 6, and 7, which can be interpreted as the number of cylinders in the engine. For example, 4 represents a four-cylinder engine, 5 represents a six-cylinder engine, 6 represents an eight-cylinder engine, and 7 represents a twelve-cylinder engine.