Honestly, I decided for a long time not to get involved in any discussions on the sites. If a person has specific technical questions, I will always answer. But the “arguments” from the series “We Know These Scientists …” were pretty fed up. Therefore, from the variety of questions asked during the discussion of Mr. Koshechkin’s article, my colleagues and I chose three. My opinion on each of them is given below.
In the early 70s of the last century, the average cost of a liter of gasoline was mainly at the level of 7.5 kopecks. Total for a tank of 40 liters you need only 3 rubles. But since then only refueling stations have changed, oil refineries have remained at the level of the 60-70s of the last century. In the mid-80s of the last century, imported engines appeared in the USSR that were unsuitable for operation in the former expanses of the USSR. The main difference is the temperature regime. Imported engines generally operate at a temperature of about 75 degrees, and in the USSR and then in the Russian Federation - at a temperature of 90 degrees. For normal operation of the imported engine, another fuel is needed, which is practically not produced in the Russian Federation, since its refineries are not able to produce. And it is unprofitable to do this, since it is necessary to completely modernize the plants first. And this is a long process that does not coincide with the national idea that has rallied all layers of the Russian Federation - HAPPIN.
Regarding the temperature of “our imported” engines and the inability to use our gasolines on them, it’s a strange opinion, at least. The optimum temperature conditions of the engines do not depend on the country of manufacture! And now this temperature there, and here - about 90 … 100 degrees., Which is dictated by the requirements of efficiency, and the ecology of the engine.
There is no direct connection between the temperature of the coolant, at least in reasonable ranges of variation, with the FHP of gasoline operating in the engine. The temperature of the near-wall combustion zones on the surfaces of the combustion chamber (on the piston and cylinder head) is significantly higher than the distillation temperature of the main working fraction of the fuel (50%), which is 110 … 120 degrees. Celsius. When the temperature in the cooling system changes by 10 … 15 deg. the temperature of these zones changes even less. Yes, and combustion occurs mainly in the volume of the combustion chamber, the temperature in which generally very little depends on what is happening outside.
By the way, “Soviet” and “Russian EURO fuels” differ very little in fractional composition (don’t believe me - compare GOST 2084–77 and GOST R 51313–99), and the entire fleet of imported equipment in Russia uses our gasolines only, and nothing bad happens.
Trust the inscriptions at the gas station with caution, because they can write anything, and they will not be anything for it, except for a tarnished reputation. Even the wording “corresponds to the ecological class EURO-4” is already misleading - so what corresponds to: “Euro-4” or “ecological class 4”? These are still slightly different things.
Our engines (I also have TSI) are designed for Euro-4 gasoline and are demanding on their sulfur content (not more than 30 mg / kg), and in our 4th environmental class, the sulfur content is not more than 50 mg / kg. Maybe this is not important, I won’t argue, but I would love to hear a specialist comment on this.
I myself refuel the AI-98, because the AI-95, corresponding to Euro-4, is not for sale in my region.
And who told you that in Europe for EURO-4 the sulfur content is limited to 30 ppm? According to European requirements, EN 228 is the same 50 ppm as in our Technical Regulations. For a gasoline engine, sulfur mainly affects the life of the catalyst, but 30 or 50 ppm is almost invisible. But if you are so worried about sulfur in gasoline, instead of spending extra money on the 98th, refuel with the 95th Lukoil, there are already less than 20 ppm of sulfur there. This is evidenced by all the results of our examinations.
Not so long ago I looked at statistics: the share of AI-95 gasoline produced in Russia is about 15% of the total. Question: where does it get such an uninterrupted amount from at gas stations? I have never seen the inscription at the gas station: "There is no AI-95 gasoline."