What Type of Gasoline Should Be Used for a Compression Ratio of 13?
1 Answers
For a compression ratio of 13, 92-octane gasoline is recommended. Below is relevant information: Compression Ratio: The compression ratio of a cylinder can be calculated by understanding the piston's stroke in the engine. For a specific cylinder in the engine, when the piston reaches the lowest point of its stroke, this position is called the bottom dead center (BDC), and the volume formed by the entire cylinder, including the combustion chamber, is the maximum stroke volume (Va). When the piston moves in the opposite direction and reaches the highest point, this position is called the top dead center (TDC), and the volume formed is the smallest during the piston's stroke, known as the combustion chamber volume (Vc). The compression ratio is calculated as the ratio of the maximum stroke volume to the minimum volume. Relationship Between Compression Ratio and Engine Performance: During operation, a gasoline engine typically draws in a mixture of gasoline and air. During compression, the piston moves upward, not only compressing the mixture to reduce its volume but also creating turbulence and swirl. When gas in a sealed container is compressed, pressure increases with rising temperature. If an engine has a higher compression ratio, the cylinder pressure and temperature generated during compression are relatively higher, allowing the gasoline molecules in the mixture to combine more thoroughly with air, resulting in finer fuel-air particles. Additionally, due to the effects of swirl, turbulence, and the high compression ratio, the sealing performance is improved. This ensures that during the next stroke, the spark plug can ignite the mixture instantly, completing combustion and releasing maximum explosive energy, which becomes the engine's power output. Conversely, the longer the combustion of the mixture takes, the more energy is converted into heat. According to the principle of energy conservation, the kinetic energy produced by the engine will correspondingly decrease.
