How to reduce the octane number

How to reduce the octane number



Octane number Is an indicator of detonation resistance of motor gasoline and other motor fuel. It is generally accepted that the higher the octane number, the better qualities this fuel possesses, which means it will significantly affect the engine performance. But often there is a need to reduce the octane number used motor fuel.





How to reduce the octane number


















You will need




  • - single-piston engine;
  • - a portable device for determining the octane number;
  • - gasoline with a low octane number;
  • - Sulfur compounds.




Instructions





1


Before considering ways to reduceoctane number, get acquainted with the features of this indicator and ways of determining the octane number. The starting point in the octane scale is the detonation stability of heptane (the octane index is 0).





2


For 100 take octane number isooctane. It is from these two substances (heptane and isooctane) that gasoline, octane number which must be reduced. Thus, the octane number gasoline AI-92 indicates that this fuel has the same detonation resistance as a mixture of 92% isooctane and 8% heptane.





3


In order to determine the octane number, the engine fuel is compared with the reference fuel,consisting of isooctane and heptane. Distinguish the following methods for determining the octane number: research, chromatography, motor and with the help of special portable devices.





4


Motor method of determining the exponentdetonation stability of fuel implies simulating a tense ride using a single-piston engine. However, this method is not perfect: the indicator obtained by this method can be somewhat understated.





5


The research method also implies the use of a single-piston engine (without imitation of driving): this method of determining the octane number can give an overestimated result.





6


Chromatographic method is used asan additional method designed to detect all kinds of impurities in the fuel, for example, benzene. However, the most reliable way to determine the detonation stability index of fuel is to measure the octane number with special portable devices.





7


Knowing the indicator of detonation stability of combustible fuel, you can bring it to the desired result, including reduce it. One way to reduce octane number - add high-octane fuel gasoline with a lower detonation resistance.





8


Octane number It can be reduced if sulfur compounds are added to the fuel with a high detonation resistance index. In addition, low octane number gasoline after primary distillation of oil: this figure does not exceed 70.





9


In addition, the indicator of detonation stability is reduced and without human intervention - with long-term storage of fuel: for an octane day number can decrease by 0.5.




























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