The longevity and reliability of the chainsaw is determined not only by the conditions of its operation, but also by the quality of the fuel used for refueling. In addition to the special conditions of use when lapping parts in the first few gas stations, attention must also be paid to the quality of the fuel mixture.
Stihl professional chainsaws are equipped with two-stroke engines requiring high-quality fuel. a dosed mixture of high-octane gasoline and oil, designed for high-speed engine operation. The right choice of gasoline and oil for Stihl chainsaw is the key to a long and successful operation of this unit.
The first question that a user is faced with before starting work is which gasoline to pour into a Stihl chainsaw.
Petrol for Stihl chainsaws is filled exclusively with unleaded high-octane, that is, with an octane rating higher than 90. If you fill it with low-octane, this is fraught with overheating of the engine, jamming of the piston and engine failure. Therefore, it is optimal to pour gasoline grade AI-92 or AI-95 into a chainsaw, but this raises the question of fuel quality.
Poor AI-92 may not reach the declared octane rating, and AI-95 often contains many additives that do not bring any benefit to the engine. In addition, if the additives are of poor quality, they do not last long, and after a few days, the purchased fuel can turn into low-octane, which is not suitable for a chainsaw engine.
At the same time, a good 95 can harm the piston system. “burn” it. Thus, some users have found a way: to refuel the chainsaw with AI-92 gasoline mixed with AI-95. This achieves the optimal balance between the octane number and the amount of filler impurities.
Unlike four-stroke engines, Stihl 180 chainsaw oil is poured directly into the gas tank, pre-mixed with gasoline. It is recommended to fill in the chainsaw oil specified in the instructions for this model.
It can significantly shorten the life of the motor, and if traces of such a substance are found in the cylinder-piston group, the instrument will be deemed removed from the warranty, i.e. it will not be subject to warranty repair or exchange.
Synthetic and mineral oils for Stihl chainsaws are sold in bottles or cans of different capacities: from 100 ml to 5 liters. Minerals have a lower cost, and semi-synthetic and synthetic ones provide complete combustion during engine operation, i.e., the absence of soot and a minimum of toxic compounds in the exhaust.
In addition, synthetic oils retain their qualities in a much wider temperature range, and also contain special additives that are useful for engine operation: antioxidant, detergent, preservative, etc.
You can choose engine oil for your tasks depending on the model of the saw and the frequency of its use: the oil consumption during the operation of the device is low, and given the shelf life of semisynthetic and mineral lubricants, there is a risk of simply not having time to use even a liter bottle to the end.
So with the small estimated volumes of work, you can not buy a bulk canister, but limit yourself to a bottle. Only Stihl mineral greases do not have a shelf life.
Stihl produces its own oil for its tool. High-quality Stihl 2-stroke engine oil is highly lubricating.
Consider the table of the range of oils for chainsaws from the official website of Stihl.
Here we see two types of motor oils:
- mineral base
- has a shelf life of 4 years,
- minimum application temperature:.10 ° C
- Available in volumes from 20 ml to 55 liters.
- has a shelf life of 4 years,
- burns completely in the piston group,
- biologically safe and decomposes in 21 days by more than 80%,
- low smoke
- minimum application temperature:.25 ° C
- Available in volumes of 100 ml and 1 liter.
The manufacturer also in the description for lubricants suggests how to dilute the mixture for refueling the saw. in a proportion of 1:50.
How to breed
The Stihl saw mixture is prepared by mixing high-octane gasoline and two-stroke engine oil. The proportion of oil and gasoline for a chainsaw is as follows: if the power of the unit does not exceed 1.5 kW, the ratio will be 1:40 (i.e. 25 ml of oil per liter of gasoline), and at a power above this value. 1:50 (20 ml 1 l).
Looking at the table of proportions, we will analyze, using the example of two saws of different power, how to mix maslobenzene.
- For a low-power STIHL MS 180 with a 2-stroke engine, the dilution will be in a proportion of 1:40. She has a fuel tank volume of only 0.25 liters. In order to mix fuel with oil for one refueling, we need 0.25 ml of oil per 0.25 liter of gasoline.
- For the STIHL MS 660 heavy duty professional chainsaw, oil and gasoline must be diluted 1:50. In this model, the fuel tank has a volume of 0.825 l. In order to understand how much oil to pour on such a volume of gasoline, we multiply 0.825 by 20. It turns out that 16.5 ml of motor oil is required.
In practice, of course, one does not have to calculate what proportion of the lubricant will be diluted in the volume of gasoline per refueling. Typically, the fuel mixture is diluted in a volume of 1-2 liters, which is enough for several refueling chainsaws.
Video: How Much Oil Dilute Per Liter Of Gasoline Trimmer
It is necessary to breed gasoline for the Stihl chainsaw in a separate canister, in no case pouring the components separately into the gas tank of the saw. In these engines there is no oil pump and the possibility of its installation, so only finished fuel is poured into the tank. There are even special canisters with two necks on sale to make it easier to dilute the mixture, but you can add oil to gasoline for a chainsaw and an ordinary canister.
It is best to observe the proportions of refueling a chainsaw as accurately as possible: excess oil will create carbon deposits on candles and pistons and will provoke detonation during fuel combustion. This can reduce engine life. In addition, the saw user in this case is forced to inhale exhaust gases with unburned fractions. At the same time, excess gasoline can damage the pistons due to insufficient lubrication.
Some craftsmen advise you to use a plastic bottle in case of the absence of special measured accessories: a full lid (from the same bottle) of oil is poured into a half-liter container filled with gasoline. The output is an approximate ratio of 1:50.
The amount of the mixture for refueling is best calculated in advance based on the estimated scope of work and the declared consumption of this engine. The tank volume in most chainsaws is about 0.5 liters, a 2 kW engine will consume about 1.2 liters per hour of operation (for more precise saw characteristics, see the instructions). Thus, it makes no sense to prepare the mixture in volumes exceeding 3 dressings in a row.
Before starting the preparation of the mixture, it is recommended to thoroughly clean and dry the neck of the canister and the area around it to avoid the ingress of impurities: dust, water, etc. The same is done with the tank before refueling: the lid and neck are cleaned of dust and adhering dirt, so that it does not get into the gas tank, and then into the engine.
Proportions of gasoline and oil for Stihl trimmer
German manufacturer of high-quality cutting tools Stihl, in addition to chainsaws, produces motor mowers. This is an indispensable tool for mowing grass and lawn trimming, characterized by lightness and mobility.
The lawn mower, or trimmer, also has a two-stroke engine and is fueled with a fuel mixture. For a Stihl trimmer, a 1:50 ratio is recommended (for 5 liters of gasoline, 100 ml of oil).
When calculating the proportions, remember that it is better to pour oil a little than to save on it: the formation of soot is dangerous only to a significant excess of lubricant, and a slight excess will not harm the engine. If it is not enough, the consequences can be more dangerous.
When mixing fuel for a Stihl chainsaw, the manufacturer recommends first pouring oil into the canister, then adding gasoline and then vigorously mixing the components. But the practice of use shows that the oil can “stick” to the walls of the canister and mix poorly, so it is better to carefully pour the oil into gasoline and mix.
It is better not to leave the remains of the fuel mixture in the tank in order to extend the life of the sealing gum and other parts subject to chemical damage. After the saw stops, the fuel must be drained and disposed of: with long-term storage (more than a month), the octane number and other physicochemical properties of the mixture decrease and it becomes unsuitable for safe use.
In addition, after the gas tank is empty, you need to start the saw engine and let it idle until it stops on its own. this will mean that the carburetor is also spared the rest of the fuel mixture.
It is important to remember that the long-term operation of the equipment is largely dependent on the user. Saving on fuel in the case of a chainsaw in the future can be much more expensive. non-warranty repair of a failed saw or the purchase of a new unit. Compliance with the manufacturer’s instructions in most cases helps to understand the principles of operation of the device and extend its trouble-free and trouble-free operation.
The chainsaw engine is the “heart” of the tool, so it is very important to use a properly prepared fuel mixture.
Fuel mixture for a chainsaw It is prepared from two components. oil and gasoline. Chainsaws are equipped with two-stroke engines, so the oil is not added to the lubrication system (like a four-stroke engine), but directly to gasoline. At the same time, it is very important to observe the correct proportions of the ingredients, of course, in no case try to work on pure gasoline, because in this way you will very quickly “kill” the chainsaw.
If we talk about which gasoline to pour into a chainsaw, it will optimally use fuel with an octane rating A-95, in this case, fuel economy can turn out disastrously. Often, European manufacturers indicate that A-90 or A-92 gasoline can be used, but in post-Soviet countries the quality of gasoline is inferior to European, so in our realities it is better to use better gasoline.
As for the most proportions of a benzo-oiled mixture, then everything is simple: you must follow the instructions for the tool. All manufacturers of chainsaws indicate the necessary ratio in the instruction manual or in the instrument passport, in addition, the proportions for refueling the chainsaw may differ depending on the model of the chainsaw. As a rule, the proportion of oil and gasoline to a chainsaw of famous manufacturers is a ratio of 1:40 or 1:50, which means 1 part of oil for, for example, 40 parts of gasoline. Now arithmetic 1 liter of gasoline = 1000 ml of gasoline, divide by 40 and get 25 ml of oil. If you perform the same steps to the ratio 1:50, then we get 20 ml of oil per 1 liter of gasoline. As for budget-made Chinese chainsaws, the situation is slightly different. The ratio of gasoline and oil for chainsaw made in China 1:25, that is, 1000 ml of gasoline is divided by 25, we get 40 ml of oil. The thing is that in branded chainsaws a good assembly and the distance between the pistons and cylinders in the engine is much smaller than that of Chinese chainsaws, therefore the required amount of oil differs almost twice.
In order to measure the correct portion of oil, use a regular medical syringe of sufficient volume.
Another subtlety. In a dry canister for gasoline, first fill in gasoline, and then oil. On the contrary, the procedure is fraught with a poor quality fuel mixture, because the oil is more dense, sticks to the bottom of the canister. what a good mix.
Be sure to prepare the fuel mixture in a can and pour ready-made special fuel into the gas tank! Never cook or mix directly in the fuel tank of a chainsaw!
If the question of how to breed gasoline for a chainsaw figured out, then on storage conditions and shelf life of the fuel mixture It is worth saying a few words. It’s best and easier to prepare a 1-liter gasoline-oil mixture, it is recommended to do this immediately before working with the tool. The fuel tanks of chainsaws have a volume of 0.3 to 1 liter. In domestic use, in one session, the entire volume of the prepared combustible mixture is rarely used, so the remainder can be saved until the next session. It is necessary to store the fuel mixture in a special canister for gasoline, in a dry, dark place. It is optimal to calculate that shelf life of the finished mixture will be 7-10 days. The fact is that the oil currently on the market is not synthetic, but organic, that is, natural. After 10 days, all lubricating properties are lost, gasoline simply “eats” the oil. Naturally, it is no longer possible to use such fuel, this can cause breakdown and failure of the chainsaw.
At the end of the work, it is necessary to drain the fuel mixture, start the chainsaw, the tool stalls (so that the saw has a dry carburetor) and now you can leave it until the next operation session.
Unsuitable fuel mixture must be disposed of.