The Relationship Between Engine Compression Ratio and Gasoline Octane Rating

[NoahMarie]

Compression Ratio and Gasoline Octane Rating are related as follows: 1. The engine compression ratio is the most important parameter in determining the appropriate gasoline octane rating. 2. There is no strict standard specifying which octane rating should be used for a particular compression ratio. With the widespread application of knock sensors and automatic ignition timing adjustment technology, vehicles with high compression ratios can also use lower octane gasoline. 3. Extension: In international automotive industry practice, the following fuel standards are widely adopted: 90 Octane Gasoline – Suitable for gasoline vehicles with engine compression ratios below 8.5. 92 Octane Gasoline – Suitable for gasoline vehicles with engine compression ratios between 8.6~9.9. 95 Octane Gasoline – Suitable for gasoline vehicles with engine compression ratios between 10.0~11.5. 98 Octane Gasoline – Suitable for gasoline vehicles with engine compression ratios above 11.6.