What is the corresponding gasoline octane number for motorcycle compression ratio?

1 Answers
SanChristopher
07/29/25 1:20pm
Motorcycle engine compression ratio is 9.5:1, using 97 octane gasoline. Generally, the higher the compression ratio, the higher the required gasoline octane number. Below is relevant information: 1. Compression ratio: The minimum working volume of the cylinder, which is the total volume above the piston when the piston is at top dead center, is called the combustion chamber volume, denoted as Vc; while the total volume above the piston when the piston is at bottom dead center, which is the maximum volume of the cylinder, is called the total cylinder volume, denoted as Va. 2. Gasoline octane number: The high or low value only indicates the size of the gasoline's octane number, and different octane numbers should be selected based on the engine's compression ratio. Mid-range cars with a compression ratio between 8.5-9.5 generally should use 93 octane gasoline; cars with a compression ratio greater than 9.5 should use 97 octane gasoline.
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