What is the size of a 1.5L engine?
1 Answers
1.5L refers to the engine displacement of 1.5 liters, where 'L' indicates a naturally aspirated engine. Displacement is a crucial structural parameter that comprehensively measures the size of an engine. The performance indicators of an engine are closely related to its displacement, and unit displacement is often used as a basis for evaluating the size of different engines. Displacement (Swept-volume), a specialized term in hydraulic transmission, refers to the volume of fluid inhaled or expelled per stroke or cycle. The space volume through which the piston moves from the top dead center to the bottom dead center is called the cylinder displacement. If an engine has multiple cylinders, the sum of the working volumes of all cylinders is referred to as the engine displacement. Naturally aspirated (English: Naturally-Aspirated) is a type of car intake system where atmospheric pressure forces air into the combustion chamber without the use of any supercharger. Naturally aspirated engines are far superior to supercharged engines in terms of smooth power output and direct responsiveness. Methods to increase the power of a naturally aspirated engine, besides increasing the displacement, include raising the compression ratio. However, too high a compression ratio can easily cause knocking. To prevent knocking, higher-octane gasoline is required, which undoubtedly increases the owner's expenses. Automobile manufacturers have employed various technologies to minimize knocking during the engine combustion process. For example, knock sensors installed on the cylinder block can detect knocking within the cylinder and send this signal to the Engine Management System (ECU). The computer then reacts to eliminate knocking inside the cylinder, such as retarding the ignition timing, but retarding the ignition timing can reduce power. Another method to reduce knocking is to lower the combustion chamber temperature by integrating more coolant passages in the cylinder head. Advantages of naturally aspirated engines: In terms of service life and maintenance costs, turbocharged engines do not last as long as naturally aspirated engines. The structure and maintenance of naturally aspirated engines are relatively simpler, offering more advantages in smoothness, durability, stability, and safety compared to turbocharged engines. In terms of power, naturally aspirated engines provide smoother and slower acceleration, making them easier to control. They also produce lower noise levels.
