The biggest cost of using a car is the fuel money, a car with 8 oil per 100 kilometers will cost more than 6 cents per kilometer, and it will cost more than 6,000 yuan to drive 10,000 kilometers. And if the vehicle needs to be refueled with 95 gasoline, if the fuel consumption is higher, then the cost will be higher. We have noticed that most of the ordinary family cars are added with 92 gasoline, which is considered by the manufacturer in order to reduce the cost of the car owner. The better performance and more expensive cars have to add 95 gasoline. Why is that? Can a car with 92 fuel be upgraded to 95?
First of all, we need to understand the meaning of gasoline labeling. The gasoline number represents the octane number of gasoline, which is an important indicator of gasoline's ability to resist knocking. The higher the gasoline grade, the higher the octane number and the better the anti-knock performance. The octane rating of No. 95 gasoline is higher than that of No. 92 gasoline, which means that it is more resistant to knockout. What is detonation? It means that when the pressure and temperature of the mixture rise, the spark plug begins to burn before ignition, resulting in incorrect combustion timing, and even multiple combustion points burning at the same time, so that the combustion is chaotic, and the energy emitted hits each other, causing the piston to vibrate violently inside, and even knock on the cylinder wall, making a rattling or clicking sound, and the whole engine will shake accordingly.
Generally, the compression ratio of high-performance engines is relatively high, and the meaning of high compression ratio can be understood as the compression of the mixture is more serious. For example, a total of 10 liters of mixed gas, after compression, becomes 8 liters, indicating that the compression ratio is small, and after compression, it becomes 2 liters, indicating that the compression ratio is large. The high compression ratio increases the explosive force in the cylinder, making the gasoline burn more completely and emit more propulsion. It's like if we push an object harder, and our arm bends a little bit to push, it can only exert very little force, and the push force is very small. And if we curl up our arms completely, we can push them again, and we can exert a lot of force, and the push will be very large. Therefore, in order to make the engine more powerful, the compression ratio of the car with high performance or large displacement will be very high.
A high compression ratio will bring a problem, the pressure and temperature of the compressed mixture will be very high, and if the ignition point of the mixture is low, it is very likely to burn on its own, and there is no need for a spark plug to ignite. If you want to solve this problem, you need the mixture not to burn so easily, and it has to be ignited by the spark plug, so you need 95 gasoline with a higher octane number. If you lower the grade and add No. 92 gasoline, it is very likely to cause knocking, which will cause serious wear on the cylinder and shorten the life of the engine. Sometimes the knock is mild and no sound is heard, but it has already started to cause damage to the engine. Therefore, the car that requires 95 gasoline can not be lowered to add 92, which will not only lead to a decrease in vehicle power and an increase in fuel consumption, but also damage the engine, which will do all kinds of harm but not benefit.
And if the car that originally added 92 gasoline can be upgraded, can it be upgraded with 95? You can take a look at the instructions or the requirements on the fuel tank cap, which is generally written, please add 92 and above gasoline, that is to say, the minimum is 92, and more than 92 can also be added. However, there is not necessarily an improvement in power and fuel consumption, and different cars have different reactions. The lower the performance, the less likely it is to improve.
Because the engine design and tuning of these vehicles is based on 92 gasoline, the use of 95 gasoline only improves knock resistance. Because it doesn't have knocking in the first place, there won't be a noticeable performance boost. Some cars originally had high compression, but only after tuning can you use 92 gasoline, or the top of the piston has more carbon deposits, at this time, adding 95 gasoline may have a significant power increase, and fuel consumption will be relatively reduced. So whether it will be better to add 95 gasoline needs to test it yourself, add the same amount of gasoline, and see which mileage is farther.
It should be noted that you can not change the gasoline label often, this time add 92 next time add 95 and add 92 next time, because the engine has an adaptation process for gasoline, when the label is replaced, it needs to adapt to itself for a period of time, in order to play the best performance. For example, if the gasoline is easy to ignite, the ignition angle should be postponed, that is, a little later, if the gasoline is not easy to ignite, the ignition should be a little earlier. In the early stage, there will be incomplete combustion, which will produce more carbon deposits and increase fuel consumption. Therefore, car owners should consider the actual needs of the vehicle and the manufacturer's recommendations when choosing gasoline to achieve the best cost performance and driving experience.