What Octane Gasoline Should Be Used for a Compression Ratio of 9.5?
1 Answers
A compression ratio of 9.5 is recommended to use 92 octane gasoline. For engines with a compression ratio between 8.5 and 9.0, 92 octane gasoline is also recommended. 92 octane gasoline has an octane rating of 92 and a heptane rating of 8, making it suitable for mid-range vehicles (those with relatively low compression ratios). The compression ratio of an engine refers to the degree of gas compression, which is the ratio of the volume before compression to the volume after compression. Generally, gasoline engines have a compression ratio between 6 and 10, while diesel engines have a higher compression ratio, typically between 16 and 22. If an engine's compression ratio is below 10, it is considered a low-compression engine; if it is above 10, it is classified as a high-compression engine. The compression ratio directly affects the grade of gasoline used in the engine.