What compression ratio is 92 # gasoline suitable for engines?

No.92 gasoline is suitable for gasoline vehicles with engine compression ratio of 8.6-9.9.

No.92 gasoline is gasoline with octane number of 92, which is suitable for mid-range cars (low compression ratio). Engine compression ratio is the most important parameter to determine gasoline grade. Academically, there is no uniform standard for what compression ratio and what brand of gasoline to use. Moreover, with the wide application of knock sensor and automatic adjustment technology of ignition advance angle, cars with high compression ratio can also use lower brand gasoline.

At present, in the practice of the international automobile industry, the following oil standards are widely adopted:

No.90 gasoline-suitable for gasoline vehicles with engine compression ratio below 8.5.

No.92 gasoline-suitable for gasoline vehicles with engine compression ratio of 8.6-9.9.

No.95 gasoline-suitable for gasoline vehicles with engine compression ratio of 10.0~ 1 1.5.

No.98 gasoline-suitable for gasoline vehicles with engine compression ratio above 1 1.6.

Extended data

The greater the compression ratio of the engine, it means that the pressure and temperature of the oil-gas mixture are relatively higher, and the gasoline in the mixture is more completely vaporized and easier to burn. When it is completely compressed, the spark plug can release more energy in a very short time, and the energy generated by combustion is finally transmitted to the wheels through the piston, crankshaft and other mechanisms, which becomes the driving force for the vehicle to move forward.

On the other hand, if the engine with low compression is not completely vaporized, then the combustion speed of the spark plug is relatively slow after ignition, so part of the energy will be converted into heat energy, which will lead to the increase of engine temperature, but it will not be completely converted into kinetic energy of the vehicle. Therefore, it can be said that under the same cylinder volume, high compression ratio means greater power output.

What brand of gasoline to choose depends on the compression ratio of the engine. The higher the compression ratio, the higher the choice of gasoline brand, because it has better anti-knock performance, can withstand higher cylinder pressure and can avoid deflagration.

Baidu Encyclopedia-Engine Compression Ratio

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