What is the difference between 93 and 97 gasoline

No. 93 and No. 97 are both car labels, and the fuel number, that is, the octane number, is a monotonic rising curve, and there is no functional correspondence with the compression ratio. The higher the fuel grade, the slower the combustion rate of the oil, the lower the combustion knock, and the higher the compression ratio of the engine; On the contrary, the combustion speed of low-grade fuel is faster, the combustion knock is large, and the engine compression is relatively low. Low-grade gasoline burns fast, and the ignition angle should lag; The combustion rate of high-grade fuel is slow, and the ignition angle should be advanced.

The most popular gasoline on the market is unleaded gasoline and has equal labels. These numbers are marked by the octane number of gasoline, which represents the anti-knock resistance of gasoline and has nothing to do with the cleanliness of gasoline. When refueling, do not be misled by the "high-grade gasoline is cleaner", add gasoline according to the compression ratio of the engine or follow the recommendations on the car's instruction manual, which is more scientific and economical, and can give full play to the power of the engine.

The evaluation index of gasoline knock resistance is the octane number, that is, the number of gasoline. It is the ratio of the knock resistance of the actual gasoline to the knock resistance of the standard gasoline. Standard gasoline is composed of isooctane and n-heptane.

Isooctane has good knock resistance, and its octane number is set at 100; N-heptane has poor knock resistance, and is prone to detonation on gasoline engines, and its octane number is set at 0. If the gasoline is marked 90, it means that the gasoline of this grade has the same anti-knock properties as standard gasoline containing 90% isooctane and 10% n-heptane. From an economic point of view, it is very uneconomical to extract high-purity isooctane for gasoline in oil refining.

Generally, multi-component alkanes containing isooctane of a certain purity are extracted and then anti-knock additives are added, which can significantly improve the anti-knock performance of gasoline. We can figuratively call it "blending". The marking of the fuel also involves the issue of engine ignition timing.

Low-grade gasoline burns fast, and the ignition angle should lag; The combustion rate of high-grade fuel is slow, and the ignition angle should be advanced. For example, an engine should add No. 97 gasoline according to the requirements of the manual, and now No. 93 gasoline is added, and the timing light needs to be used to adjust the ignition advance angle lag by one to two degrees. If you do not follow the advice of the OEM, use low-grade fuel, and do not adjust the ignition time, it may cause difficulty in engine starting; When accelerating, there is a crisp sound of metal crashing inside the engine; After a long drive, the engine shakes or does not stop when the ignition is turned off.

So is it better to choose gasoline with the higher the grade? Neither is it. The main basis for the selection of gasoline marking is the compression ratio of the engine.

Parameters such as compression ratio and ignition advance angle have been set in the engine computer, and the owner will have absolutely no problem as long as he chooses gasoline in strict accordance with the requirements of the instructions. In the engine computer program of modern automobiles, there is an adaptation program for micro-adjustment of gasoline with poor explosive resistance, but there is no corresponding program for high-grade gasoline. Therefore, the blind use of high-grade gasoline will not only produce the phenomenon of acceleration weakness while driving, but also the advantages of high anti-explosion can not be brought into play, and it will also cause a waste of money.

The octane number is different, and the combustion value is different

In practice, different riders have different experiences and different opinions on the use of No. 93 oil and No. 97 school:

93 and 97 are just different octane numbers, and have nothing to do with the cleanliness of the fuel, so 97 is cleaner than 93 to be verified. It's just that the fuel ** is different, the quality is unstable, and in some gas stations 97 may only reach the standard of 93. 97 to 93 doesn't necessarily make the car more powerful (or even the opposite), just because the oil is pure, and the fuel consumption may be reduced.

Pie: 97 oil has better anti-knock resistance, the action of the engine is softer when used, and there is no feeling in terms of power and fuel consumption. 97 100 kilometers is half an oil saving than 93, and the price difference has been recovered, 97 is very good! It's a meat spot that looks better than 93, but it feels smooth when the revs are pulled up, and there is not much difference, and the 97 seems to be more fuel-efficient than the 93.

GIX car: With 97, the throttle valve, fuel injector, oil circuit, and cylinder are all clean, and it doesn't cost much, so why not. It feels like the 97 runs a little softer, and as for acceleration and fuel consumption, it is about the same as the 93.

It's purely personal, and the difference is quite obvious. The feeling of 97 is cooler than that of 93, but after switching to 97, the fuel consumption is 1L higher than that of 93, which may also be a bad road.

3. Centrists:

I've used it for a while, and I feel that 93 is more energetic, but 97 seems to be able to run more kilometers, and I feel that there is basically no big difference in the number of kilometers for the same money, and I can't save much money. GTX from 93 oil to 97 oil doesn't feel anything. The car with the 97 is lighter and more fuel-efficient, but the acceleration is not effective.

The compression ratio of the T series car is a little higher than that of the I series car (of course, it is not so high that you have to use 97 oil), CT car: In the feeling of car lovers, 97 is slightly slower than 93 speed, not that the speed is not good, it is a little delay, not as explosive as 93, and it feels like it will come up. Don't worry too much about it, but stick to it when you want to add 97 oil.

Finally, it is recommended that users add the corresponding fuel according to the requirements of the user manual, otherwise the maintenance problem will be difficult for the manufacturer! For high-end imported cars, it is still recommended to use 97 oil, and for domestic mid-range cars, 93 oil is sufficient. If you accidentally mix the two fuels, it's not a big problem, just add back to the original oil number after use.

The difference between 93 and 97 is that the octane number is different, and the higher the value, the higher the compression ratio of the engine. The opposite is low.

The moisture content of 97 is less than that of 93, and the quality of 97 oil is also high, which is less damaging to the car cylinder block.