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Recently, cars with turbocharged engines have appeared on the market, in which the tempting inscription AI-92 flaunts on the gas tank lid. Many are perplexed, because low octane
A number of new Chinese and European vehicles are specified in their specifications to be able to use low-octane, low-cost gasoline. So, in the turbocharged engines of the Chinese brand Exeed it is allowed to use AI-92, although these units have a rather high compression ratio. The situation is similar to Geely. For example, on the Coolray crossover there is a modern “Volvo” heavily loaded 1.5-liter three-cylinder “heart”, which can fill the “ninety seconds”. Renault also gives some leeway when choosing fuel: its 1.3-litre turbo engines can also use low-octane fuel.
At first this seems surprising, because everyone knows that engines have a compression ratio of more than 10 units. prone to explosion and require a high octane “ninety-fifth”. At the same time, if the compression ratio exceeds 12 units, AI-98 should already be completed. And the 1.5-liter Exeed LX engine has a compression ratio of 11 units, the Geely Coolray has 10.5, just like the Renault 1.3 TCE 150. And because of that, the wrong fuel can easily cause problems.
Low octane gasoline is bad because in heavily loaded engines it can cause the effect of detonation, i.e. premature ignition of the fuel during the compression cycle. Usually this occurs at high pressure, which is provided by turbocharging, at high engine speeds and at high temperatures. Undermining the fuel at a time when the piston has not yet reached top dead center, the wave hits it in the opposite direction, hindering its movement, reducing engine power and its return.
Worst of all, the epicenter of the breakout is often everywhere, including along the edges of the combustion chamber, after which the blast wave causes the piston to slide along the cylinder walls, causing scuffing. These beats create a distinctive ring tone that is clearly audible. The more explosions there are, the worse it is for the engine. Not only does the power decrease, but the resource is also significantly reduced. In other words, trips on low-octane fuel on vehicles for which it is contraindicated lead to overhaul at trips of 50-100 thousand km.
Admittedly, we live in the age of electronics and engineers have learned how to reduce the harmful effect of explosions, even for high compression ratio engines. This is done through automatic correction of ignition timing and boost. Once the sensors detect explosions, the electronics will change the engine settings. As a result, the engine’s power and torque are reduced, which prevents the engine from reaching passport characteristics.
It is this anti-knock algorithm that makes it possible to use low-octane fuel in modern high-performance engines. Manufacturers promote this software protection as a publicity stunt to promote their technology. It is believed that the ability to work on an inexpensive AI-92 attracts buyers. But what does it deliver in terms of consumer qualities?
The power and dynamics of the car when using cheap gasoline is reduced and the risk of explosion remains, especially, we repeat, at high speeds, with the maximum engine load. Is the savings of 100-150 rubles per gas station worth all these risks?
In general, modern turbocharged engines can power AI-92. If the driver is accustomed to a calm driving style, never revs the engine to the red zone and tries to avoid overtaking, then low-octane gasoline is quite acceptable for his car.
If the pilot prefers a sporty driving style and high speeds, then there is no point in using the AI-92. Firstly, the engine power will not be enough, and secondly, under such driving conditions, short-term detonations will have a detrimental effect on the technology. In order for the engine to reach passport characteristics and realize its full potential, it needs a more stable fuel, for example AI-95 or even AI-98.
A number of new Chinese and European vehicles are specified in their specifications to be able to use low-octane, low-cost gasoline. So, in the turbocharged engines of the Chinese brand Exeed it is allowed to use AI-92, although these units have a rather high compression ratio. The situation is similar to Geely. For example, on the Coolray crossover there is a modern “Volvo” heavily loaded 1.5-liter three-cylinder “heart”, which can fill the “ninety seconds”. Renault also gives some leeway when choosing fuel: its 1.3-litre turbo engines can also use low-octane fuel.
At first this seems surprising, because everyone knows that engines have a compression ratio of more than 10 units. prone to explosion and require a high octane “ninety-fifth”. At the same time, if the compression ratio exceeds 12 units, AI-98 should already be completed. And the 1.5-liter Exeed LX engine has a compression ratio of 11 units, the Geely Coolray has 10.5, just like the Renault 1.3 TCE 150. And because of that, the wrong fuel can easily cause problems.
Low octane gasoline is bad because in heavily loaded engines it can cause the effect of detonation, i.e. premature ignition of the fuel during the compression cycle. Usually this occurs at high pressure, which is provided by turbocharging, at high engine speeds and at high temperatures. Undermining the fuel at a time when the piston has not yet reached top dead center, the wave hits it in the opposite direction, hindering its movement, reducing engine power and its return.
Worst of all, the epicenter of the breakout is often everywhere, including along the edges of the combustion chamber, after which the blast wave causes the piston to slide along the cylinder walls, causing scuffing. These beats create a distinctive ring tone that is clearly audible. The more explosions there are, the worse it is for the engine. Not only does the power decrease, but the resource is also significantly reduced. In other words, trips on low-octane fuel on vehicles for which it is contraindicated lead to overhaul at trips of 50-100 thousand km.
Admittedly, we live in the age of electronics and engineers have learned how to reduce the harmful effect of explosions, even for high compression ratio engines. This is done through automatic correction of ignition timing and boost. Once the sensors detect explosions, the electronics will change the engine settings. As a result, the engine’s power and torque are reduced, which prevents the engine from reaching passport characteristics.
It is this anti-knock algorithm that makes it possible to use low-octane fuel in modern high-performance engines. Manufacturers promote this software protection as a publicity stunt to promote their technology. It is believed that the ability to work on an inexpensive AI-92 attracts buyers. But what does it deliver in terms of consumer qualities?
The power and dynamics of the car when using cheap gasoline is reduced and the risk of explosion remains, especially, we repeat, at high speeds, with the maximum engine load. Is the savings of 100-150 rubles per gas station worth all these risks?
In general, modern turbocharged engines can power AI-92. If the driver is accustomed to a calm driving style, never revs the engine to the red zone and tries to avoid overtaking, then low-octane gasoline is quite acceptable for his car.
If the pilot prefers a sporty driving style and high speeds, then there is no point in using the AI-92. Firstly, the engine power will not be enough, and secondly, under such driving conditions, short-term detonations will have a detrimental effect on the technology. In order for the engine to reach passport characteristics and realize its full potential, it needs a more stable fuel, for example AI-95 or even AI-98.
Source: Avto Vzglyad
Donald Salinas is an experienced automobile journalist and writer for Div Bracket. He brings his readers the latest news and developments from the world of automobiles, offering a unique and knowledgeable perspective on the latest trends and innovations in the automotive industry.
