Should a family car use 92 or 95 octane gasoline?
1 Answers
Family cars generally use 95 octane gasoline, but some vehicles may specify "only 92 octane gasoline should be used," in which case only 92 octane gasoline should be used. The following are the differences between 92 and 95 octane gasoline: Different compositions: 92 octane gasoline contains approximately 92% isooctane and 8% n-heptane, while 95 octane gasoline contains approximately 95% isooctane and 5% n-heptane. Isooctane has better anti-knock properties, while n-heptane has poorer anti-knock properties. Therefore, the higher the octane number, the higher the octane value, indicating better anti-knock performance of the gasoline. Each engine is comprehensively evaluated before leaving the factory, and based on the engine's performance and other data characteristics, the required anti-knock properties are specified, which determines the appropriate octane rating of gasoline to be used. Different power outputs: Higher octane gasoline, such as 95 octane, is suitable for engines with higher compression ratios. This is because as the engine speed increases, the ignition timing in the cylinder advances. When the speed reaches a critical point, the air-fuel mixture in the cylinder may ignite prematurely before the spark plug fires, a phenomenon known as "knocking." Increasing the octane value of the gasoline can effectively improve anti-knock performance.
