Mixture for 2-stroke engines
2-stroke engines require a mixture of gasoline and oil for lubrication. The mixing ratio depends on the technical conditions. Only special 2-stroke oil can be used as oil, which retains its lubricity under these special conditions. Special measures apply to oldies.
This is how a 2-stroke engine is lubricated
- In contrast to the 4-stroke engine, the 2-stroke engine does not have an oil pan. The crankcase is very tight because it is used to pre-compress the fresh gases. In order to bring oil to all moving parts, it is added to the gasoline-air mixture that the engine sucks.
- The oil-containing fresh gas is supplied to the relevant bearing points and the piston whirled where it is necessary to maintain a lubricating film sufficient. Unfortunately, the oil content of the gasoline then causes the well-known fragrant plume of smoke when it is burned.
How to make the mix
Observe the manufacturer's instructions regarding the type of oil, the type of gasoline and the mixing ratio.
- Engines built before 1970 were often prescribed a "rich" mixture in their day. The oils used at the time could only guarantee lubrication under these conditions.
- With the increasing quality of the 2-stroke oils, the manufacturers gradually allowed the to become lean Mixing ratio and thus a reduction in the environmental impact of burned oil, the so-called 2-stroke flag. There are now engines that even run trouble-free with a ratio of 1: 100.
- For real oldies, a ratio of 1:25 was usually used. You can assume that this regulation no longer applies in full. Such engines run safely with modern oil even if you lean the mixture down to 1:40. Remember that the richer the mixture, the more intense the exhaust plume.
- For high-performance engines, such as in chainsaws, 1:50 is usually mixed, but with a special high-performance oil. You should strictly adhere to this requirement, otherwise you risk engine damage and the manufacturers will not provide a guarantee if it turns out that you have used a different oil.
With 2-stroke engines, the engine is lubricated, not as with 4-stroke engines ...
You can make a gasoline-oil mixture at home in a canister. To do this, first calculate how much oil needs to be added to the mixture. With a ratio of 1:50 this is 100 ccm or 0.1 liter of oil for 5 liters of gasoline. Put about 2 liters of gasoline in the canister, pour in the oil and shake the mixture vigorously. Then fill up the target amount of gasoline - done.
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