How to reduce the octane number

Octane number is a measure of detonation resistance of gasoline and other motor fuel. It is considered that the higher the octane number, the better the qualities of this fuel, and therefore, it will significantly affect engine operation. But there is often a need to reduce the octane number of motor fuel used.

You will need

• - odnomarshevoy engine;
• - a portable device for determination of octane number;
• - gasoline with a low octane rating;
• - sulfur compounds.

Instruction

1. Before considering ways to reduce the octane number, meet the indicator, and means for determining octane number. The origin of the scale in octane – detonation resistance of heptane (octane index equal to 0).
2. Over 100 attended the octane number isooctane. It is from these two liquids (heptane and isooctane) and is gasoline, the octane number which has to be reduced. So, the octane number of gasoline a-92 indicates that the combustible fuel has the same knock resistance as a mixture of 92% isooctane and 8% heptane.
3. To determine octane number, motor fuel is compared with a reference consisting of isooctane and heptane. There are the following methods of determination of octane number: research, chromatography, motor and via portable devices.
4. The motor method of determining the measure of detonation resistance of the fuel involves a simulated hard drive with the use of single-piston engine. However, this method is not perfect: the result obtained from this method may be somewhat understated.
5. The research method also involves the use of single-piston engine (no simulation ride): this method for determining the octane number may give falsely high results.
6. Chromatographic method is used as an additional method designed to detect all possible impurities in the fuel, for example, benzene. However, the most reliable method of determining the measure of detonation resistance of the fuel – measuring octane number of a portable devices.
7. Knowing the rate of detonation of sustainability of fossil fuels, you can bring it to the desired result, including reduced. One way to reduce the octane number is to add high-octane gasoline with a lower index of detonation resistance.
8. The octane number can be reduced if to add to the combustible fuel with high detonation stability of sulfur compounds. In addition, the low octane number of gasoline after the primary distillation of crude oil: this figure does not exceed 70.
9. In addition, the increased detonation resistance and decreases without human intervention − during long-term storage of energy: the day the octane number can be reduced to 0.5.