Should Changan Cars Use 92 or 95 Gasoline?
2 Answers
Changan cars normally use 92 gasoline because their compression ratio ranges between 8.5 and 9.5. Below are the specific details on gasoline selection: Gasoline Selection: Engines with a compression ratio between 8.5 and 9.5 generally use 92 gasoline. For models with a compression ratio greater than 9.5, 95 gasoline is recommended. This is because engines with higher compression ratios typically deliver greater power and fuel efficiency. To achieve better stability, they require gasoline with superior anti-knock properties. The advantage of 95 gasoline over 92 lies in its higher octane content, which provides better anti-knock performance. Compression Ratio: During the operation of an internal combustion engine, as the air-fuel mixture in the cylinder decreases, ignition tends to become irregular. Conversely, an increase in the mixture can lead to knocking, thereby limiting efficiency. As one of the key parameters affecting torque, fuel economy, and emissions, the compression ratio is a technical specification that addresses this issue. The influence on power and torque output can be broadly indicated by the engine's compression ratio. The compression ratio measures the degree to which the gas in the cylinder is compressed as the piston moves from the bottom dead center to the top dead center. Selecting an appropriate compression ratio to balance various parameters is a crucial method for enhancing the performance of internal combustion engines.
Having driven Changan cars for over a decade, I'm quite qualified to speak on this matter. Currently, Changan vehicles mainly fall into two categories: naturally aspirated models like the Eado and CS35 - these old buddies clearly require 92-octane gasoline as specified in the manufacturer's manual; while turbocharged models like the UNI series or CS75 PLUS need 95-octane to perform at their best. My own Eado has been running on 92-octane for 80,000 kilometers without any issues. However, I once borrowed a friend's CS75 PLUS and noticed the fuel cap had a 95-octane label inside - you really shouldn't use lower-grade fuel in such cases. The octane rating primarily affects anti-knock performance - using low-octane fuel in high-compression engines causes knocking sounds and can damage the engine over time. When in doubt, just check the label inside the fuel cap - manufacturers thoughtfully print the requirement there.
