Some car owners have been adding No. 92 oil to their cars, and accidentally added 95 oils once but feel that their car power has become stronger, and the sound of engine operation has decreased. Is there really such a big difference between No. 92 gasoline and No. 95 gasoline? Gas station employees accidentally told the truth.
What is the difference between No. 95 and No. 92 gasoline?
For No. 92 oil and No. 95 oil, there are many "rumors", for example, the oil of No. 95 oil is better, the main components are very different, so the calorific value is higher, so it is more resistant to burning. Some people say that No. 92 and No. 95 are actually just different in explosion resistance, and there is no difference in calorific value. In fact, the truth of the matter is that there is no difference in calorific value between the two, but No. 95 gasoline is more resistant to explosions, has greater potential, and can achieve significant fuel saving and optimize the effect of engine noise with suitable models. To give an inappropriate example, just like giving a good grain and grass to a Maxima can burst out the maximal potential of a Maxima, while an ordinary horse can eat well and have a limited speed.
The difference between No. 92 and No. 95 gasoline is the difference in octane number, resulting in a difference in explosion resistance. Mr. Cui Yongsheng of Sinopec Oil Technology Research Institute explained in detail the difference between high and low gasoline, as well as the relationship between gasoline label and power and fuel consumption.
Octane number is used to measure the explosion resistance of gasoline, in general, the higher the gasoline label, the higher the octane number, the better the explosion resistance. And explosion resistance refers to the detonation, that is, before the engine ignites the spark plug, the gas mixture in the cylinder is abnormally violently burned because the temperature in the cylinder is too high, and the flame propagation speed of gasoline in the cylinder is 10m/s ~20m/s, and once the detonation occurs, the flame propagation speed can reach 1500-2000m/s, and there is a large noise and vibration, and even causes damage to the engine.
How does explosion resistance affect noise and power?
So how exactly does explosion resistance affect the NVH and power of the engine? This is related to the ignition advance angle of the engine. Ignition advance angle can be simply understood as the early time of spark plug ignition, and when the gas in the cylinder is compressed to the maximum limit, the energy generated by the combustible mixture can be effectively used by early ignition, so the ignition advance angle when the engine obtains the best power, economy and best emission is called the best ignition advance angle.
The larger the ignition advance angle, the more prone to knocking, and the higher the explosion resistance of gasoline.
The smaller the ignition advance angle, the less likely it is to detonate, but the power of the engine will decrease.
Like high compression ratio engines, such as Chuangchi Blue Sky engines, or turbocharged engines, the use of high label oil, can increase the ignition advance angle at the same time, the probability of detonation is greatly reduced, so as to achieve the effect of enhancing power and reducing noise.
Therefore, such as Volkswagen and other turbo engines, manufacturers are recommended to use No. 95 gasoline, and Although Mazda's Chuangchi Blue Sky series can also use No. 92 gasoline, Mazda also said that the use of No. 95 gasoline will get a better power experience and fuel economy. So on how to choose the 92 and 95 numbers, the big principle is that the manufacturer recommends adding what to add, in addition, if you are a high compression ratio engine, not bad money to add 95, it is indeed improved in all aspects.