Structurally, the engine of new chainsaw models has from one to two cylinders, the fuel supply to which is regulated by a carburetor. Since the engine shaft rotation speed is quite high (in some models it reaches 14 thousand rpm), strict requirements for the fuel mixture are established. In the technical documentation for a specific chainsaw model, the manufacturer describes the composition in detail, indicating possible tolerances. Let's consider what kind of gasoline to pour into a chainsaw, as well as in what proportions it is allowed to be mixed with additives and oil.
Features of the chainsaw device
The main working unit of a chainsaw is a mounted chain with cutting elements, to which rotation is transmitted from a carburetor-type engine. The most commonly used are single-cylinder two-stroke engine models, which are distinguished by their reliability and good resistance to loads.
The most important structural parts of a chainsaw, which do not depend on a specific model:
- Carburetor;
- Tire with chain tensioner;
- Chain cutting unit;
- Launch block;
- Clutch basket with centrifugal type;
- Ignition system – magneto and spark plug;
- Oil supply for chain;
- Exhaust gas removal system;
- Knobs for adjusting the number of revolutions.
The location of the motor is selected depending on the load on the tool - for professional use it is located vertically, and in simple, household models - horizontally.
Operating principle - the main shaft is connected to a motor, which transmits rotational motion at high speed. Through the clutch, the shaft transmits angular velocity to the sprocket connected to the tire. The bar, in turn, drives the saw chain.
How to dilute gasoline with trimmer oil
dilute gasoline for the trimmer in the correct proportion. An insufficient amount of oil can lead to poor lubrication of the trimmer elements, which contributes to rapid wear.
How to prepare a fuel mixture for STIHL tools
The correct ratio can be found in the trimmer instructions. Most often it is 1:25, 1:40, 1:50. To obtain these proportions, in 1 liter of gasoline you need to add 40 ml, 25 ml and 20 ml of oil, respectively.
It is unacceptable to dilute gasoline with lubricant directly in the fuel tank, and the proportion of oil and gasoline must be strictly observed. If you ignore this rule, the operation of the trimmer motor may be unstable, which is why it will quickly fail.
It is not recommended to use plastic bottles or canisters for this purpose. This is due to the fact that gasoline tends to dissolve plastic, which means that some of the plastic can get into the fuel tank, which can lead to carburetor failure. Although there are special plastic canisters marked “flame”.
- petrol;
- oil suitable for two-stroke engines with air cooling system;
- canister, preferably metal;
- mixing container, also preferably metal;
- gloves;
- respirator.
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Make a mixture of gasoline and oil as follows:
- Pour 1 liter of gasoline into a container, add half the required portion of oil. Mix thoroughly, do this with extreme caution, away from sources of open flame.
- Add the rest of the oil to the trimmer gasoline and mix thoroughly again. Now fuel can be poured into the trimmer's .
The mixture can be stored for no more than three months, so it is better to dilute gasoline in such an amount that it is enough for several uses.
What fuel should I use for my chainsaw?
The primary document in which the type of fuel is written is the manufacturer’s passport. Usually, a specific type is always indicated there (with options for acceptable replacement), and instructions for preparing the fuel mixture are also described in detail. These parameters are individual for different types of engines, so you should not fill the tool with a mixture prepared according to the instructions for another model.
What kind of gasoline to pour into a Stil chainsaw or a Husqvarna chainsaw:
- Only well-refined high-octane fuel;
- Be sure to dilute it with a special brand of oil in the required proportion;
- Some models require the addition of additives.
Gasoline selection
Quite often you can come across a question from owners of gas-powered tools about what type of fuel will improve the performance of the unit. As a rule, manufacturers give recommendations on the use of gasoline with an octane number of at least 90. In practice, these are fuel grades AI92 and AI95. It is not recommended to use fuel with higher octane numbers, or to fill 95 gasoline with 92..
Please note that it is better to refuel the chainsaw with newly purchased gasoline, since long-term storage in inappropriate conditions causes the fuel to decompose, which significantly deteriorates its quality. The most well-known chainsaw manufacturers give the following recommendations:
- STIHL - only high-octane fuel from AI90;
- PARTNER – a mandatory requirement to use unleaded gasoline with an octane rating of at least 90;
- HUSQWARNA – pure gasoline grades AI92 or AI95.
Oil selection
To operate a chainsaw, you need to buy two types of oils - motor oil and chain oil. They differ in their physical and chemical properties, so they cannot be interchanged. Designed for the following tasks:
- Motor oil - to create a protective oil film on the contacting parts of the engine;
- Chain oil – to protect the cutting surface of the saw chain.
When an engine is running with a mixture of gasoline and motor oil, the carburetor injects fuel and oil mist, which creates a protective film on the working surfaces of the engine that prevents wear. It is recommended to use motor oil from the manufacturer that produced the chainsaw, but if there is no strict indication in the passport, then you can use any that is intended for two-stroke engines.
To apply lubricant to the chain, it is also best to take oil from the manufacturer of the gasoline tool, but if it is not available, then the type closest in terms of characteristics is gear oil.
Features of preparation and storage of the fuel mixture
An important step when working with chainsaws is refueling them. If the proportions have been met, then incorrect preparation of the mixture can cause new problems. Therefore, it is recommended to adhere to some rules that are necessary:
- Avoid using mixing containers made of plastic or glass, as these materials will cause a spark that may ignite gasoline vapors. It is best to use special aluminum cans for fuel.
- Carefully ensure that foreign bodies, debris, dirt and other substances do not get into the reservoir with the mixture. Even a few grams of water can cause negative effects.
- Stir the mixture before pouring it into the chainsaw.
Such rules will help people who do not know how to dilute gasoline for a Stil chainsaw or any other brand.
Features are associated not only with the creation of the mixture, but also with its further storage. Do not use oil and gasoline if their contact lasted more than 30 days (shelf life). Such actions will lead to damage to the engine system. In this case, you will not be able to take advantage of the warranty for repairs, since such a reason is considered not covered under warranty.
Refueling a chainsaw
The process of loading the fuel mixture into the instrument’s gas tank is quite primitive - you need to unscrew the neck and pour gasoline through the filter element. The main questions are about preparing a mixture of gasoline and oil. Here it is necessary to maintain the correct proportions according to the recommendations provided by the manufacturer. It is necessary to fill the chainsaw only with a mixture with the correct ratio of components, as this affects the life of the engine.
Gasoline to oil ratio
Regulatory documentation adopted in the Russian Federation defines the standard ratio of gasoline-oil mixture used for two-stroke engines - 1/50. When calculating according to the rules of proportion, it turns out that 10 milliliters of motor oil must be dissolved in 0.5 liters of gasoline. This is a basic value that each manufacturer changes based on the design features of its engine. It is recommended to use only the composition instructions reflected in the instrument data sheet.
There are other proportions for gas-powered tools that are actively used by foreign manufacturers, for example:
- 1/60 – 8.25 ml of oil is added to 0.5 liters of gasoline;
- 1/33 – 15 ml of oil is added to 0.5 liters of gasoline.
It is impossible to independently determine the proportion of fuel depending on the type of engine.
How to mix the fuel mixture correctly
Initially, it is necessary to prepare containers and measuring instruments with the required accuracy. All utensils must be clean and free of other ingredients, dirt or water.
A graduated canister will do, as will a regular 10-20 mg medical syringe. Pour gasoline into the canister up to the mark, and then use a syringe to add the calculated amount of engine oil. After this, the canister is closed with a screw cap and mixed with forward movements for 3-5 minutes.
Work must be carried out in a well-ventilated area. Do not use a plastic canister due to the potential for spark formation (and subsequent fire) due to static electricity.
Storage conditions for the finished mixture
Do not store the gasoline-oil mixture for a long time due to the possibility of decomposition of the components and deterioration in quality. The optimal storage period is no more than 90 days.
It is necessary to use opaque canisters for storage; it is advisable to maintain the room temperature at 15-20 degrees and not place the mixture near heating devices (or other heating surfaces). It is necessary to ensure conditions in which the mixture is not exposed to direct sunlight.
Choosing two-stroke oil for a chainsaw
Having decided on the question of how to dilute gasoline and oil in a chainsaw, it is worth finding out what type of lubricant is best to use. To begin with, you need to understand that it is necessary to mix fuel exclusively with two-stroke oils, but not with motor oils for automobile engines, and even more so, for development.
Special oils are called two-stroke. In color they are not only red, but green and blue. The red color indicates that it is mineral (the cheapest). Blue and green are semi-synthetic. Semi-synthetic is naturally better, but when it comes to one-time use (that is, when the lubricant burns along with gasoline, then mineral oil is the best option in terms of cost and reliability). The color of the oil also indicates the use of appropriate additives, but the most important thing is to choose a lubricant from well-known manufacturers. You can tell by the color that fuel is mixed with lubricant.
Today it is very easy to buy a fake or low quality lubricant, so you should not save. The following manufacturers are recommended to choose two-stroke oils:
- Stihl.
- Liqui Moly.
- Husqvarna.
- ECHO.
- Makita.
If, when purchasing expensive oils, they tell you that you are overpaying for the brand, then this is so. Only you also pay for the guarantee that the substance you purchase is of high quality and has only a positive effect on the engine of the tool. There is no need to look for cheaper options, because by saving on fuels and lubricants, you reduce the service life of the engine and the entire tool as a whole.
To summarize, it should be noted that chainsaws must be refueled with a gasoline-oil mixture in the ratio of 20 ml of oil per 1 liter of fuel. If you use a proportion using 25 ml of lubricant, then nothing bad will happen to the internal combustion engine.
Alternative fuel option
As an alternative, many are offered to refuel with AI95 gasoline, but the issue remains controversial. In theory, the characteristics of such fuel are better, but in practice it is better not to take risks and refuel the chainsaw with the usual Soviet AI92.
The main nuance is that AI95 contains additives that are individually selected by the fuel manufacturer. In some cases, such additives can adversely affect the performance of a two-stroke engine.
Choosing oil for lawn mowers
For trimmer engines, it is necessary to choose oils marked “2T”, which are used for internal combustion engines with a volume of 50 to 200 cm 3 and are air-cooled. First of all, when buying oil, you should pay attention not to the price, but to the protective properties of the material, since small savings can subsequently become a real headache for the owner and, as a rule, large costs.
The main factor determining the quality of trimmer is the base number. It is this component that prevents oxidation of rubbing parts and slows down their destruction. During operation, the oil gradually loses its alkalinity and becomes oxidized. The optimal acidity level (Ph) should not be less than 8-9 units.
The viscosity of the brush cutter oil also has a great influence on the operation of a gasoline tool. This indicator determines the ability to operate the trimmer at different temperatures. For example, summer brands of lubricants thicken even with a slight drop in temperature. Due to the use of lawn mowers exclusively in the spring and autumn, oil with summer markings would be an excellent option.
The flash point for trimmer oil must be more than 225C, otherwise the oil will quickly burn out and the piston group will be subject to intense wear.
Risks of using fuel and oil substitutes
In the technical documentation for chainsaws from any manufacturer, you can find a warning that refueling the engine with biofuel and gas condensate surrogate is prohibited. This is due to the unstable characteristics of such fuel, which can significantly damage the engine and reduce its service life. If you pour such a mixture into a chainsaw, it will void the manufacturer's warranty.
In addition, there is a risk of purchasing low-quality motor oil, the market for which, according to some estimates, is 10-12%. In order not to buy low-quality oil, it is recommended to use only trusted stores, preferably approved by the chainsaw manufacturer.
Advantages and disadvantages of oil
Any high-quality engine oil has its pros and cons
Any high-quality engine oil has its pros and cons. Some experts say that any chainsaw oil will do. This is not entirely true; almost any substance can be used for the Hurstavna chainsaw, but only gear oil is required for the STIHL . When choosing, you need to know the color of the oil well; a two-stroke engine requires a composition that has a reddish, bluish or greenish tint.
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To prepare the mixture yourself, you need to use a heat-resistant lubricant that has a well-known brand.
The density of the product is affected by seasonality:
- Solar radiation intensity.
- Pressure.
You can find out what the features of different oils are by carefully studying the label on the container. If there are no instructions or labels on the package, you should refuse to use such a substance. At the same time, the performance characteristics of oils should not change dramatically when temperature conditions change.
You should not use any substitutes; counterfeit products are often found among them (up to 20%). It is quite difficult to distinguish a fake; you need special equipment.
It is recommended to store fuel in metal containers. It is best to prepare the fuel mixture in a canister.
There are a large number of oils and each has its own characteristics
The consistency is made in the ratio:
The performance characteristics of mineral or organic oil intended for the chain itself are not suitable for preparing the fuel mixture. The container is filled with the finished product (up to half), then mixed (the container must be hermetically sealed). Thus, a homogeneous composition is obtained. It is better not to prepare the fuel ahead of time; it quickly loses its functional properties. At room temperature, flammable liquids deteriorate within two weeks.
How much gasoline does a chainsaw consume?
Professional models with good engine power (up to 7-10 hp) consume up to 3.5 liters per hour in normal operation. The same figure for low-power units (3-5 hp) is much less and ranges from 0.5 to 1.5 liters per hour.
It is recommended not to pour fuel into the chainsaw to fill the entire volume available in the tank at once. This must be done in portions.
New models of chainsaws are very sensitive to the quality of the fuel used. It is important to understand that using the correct and high-quality mixture has a serious impact on the service life.
STIHL chainsaw: what gasoline oil should I use?
A number of manufacturers producing equipment also produce their own consumables, which are adapted to the operation of a specific engine. Likewise, STIHL produces oil exclusively for its equipment. It is equipped with special additives that can compensate for the quality of the fuel, improving lubrication and cleaning of the fuel mixture. It should be noted that Husqvarna HP oil is universal and can be used for any chainsaw. It can be used at temperatures not lower than 10 degrees.
The following brands are also used for two-stroke engines: Sadko, Kraissmann, Oleo-mac Prosint. If you use a STIHL , how much oil should you fill per liter of gasoline? The ratio will be 25 ml of additive per liter of fuel. We must remember that there are oils for chains and motors. They are intended for different purposes and are not interchangeable. Using chain oil to prepare a fuel and lubricant mixture leads to tool failure.
What chain oil should I use?
The oil for lubricating the chain is recommended by the manufacturer and indicated in the tool data sheet. These are usually branded products that are of high quality. While the chainsaw is new, it is necessary to use it. Otherwise, if the tool breaks down, it is removed from the warranty and repairs are made at the user's expense. Subsequently, the oil is replaced with a cheaper one, but it must meet the following requirements:
- protect the chain from corrosion;
- increase wear resistance by reducing friction;
- do not form carbon deposits;
- maintain the ability to work with the tool in a wide temperature range.
To ensure long-term operation of the chainsaw in good condition, it is better not to skimp on chain oil.
Characteristics of household chainsaws
Specialized equipment stores offer a wide selection of both domestic and foreign chainsaws. For household purposes, a lightweight tool is provided that does not have high performance. Its main element is a chain with cutting teeth. Its rotation is provided by a 2-stroke gasoline engine, which does not have a separate lubrication system for rubbing parts. To do this, not pure gasoline is poured into the gas tank, but a mixture of it with oil, which not only ensures engine operation, but also lubrication. When preparing the mixture, each owner should know how to dilute gasoline with chainsaw oil.
The rotation speed of the chain depends on the speed of the engine, which is cooled by air. A separate oil tank is provided for lubrication and cooling. As its rotation speed increases, the automatic oil supply also increases. For normal operation of the chainsaw, it is necessary to control the contents of two tanks - for the operation of the engine and the chain.
How to refuel a chainsaw
Let's look at how to refuel a chainsaw. If the saw is not threaded correctly, this may pose a threat to the life and health of the operator of the device.
There are rules that must be followed when refueling the saw:
Do not spill oil or fuel mixture; the place where the saw will be refueled must be level; the place must be more than 2 m away from the area where the device will be used; the area should be located away from fire; Smoking is prohibited in this area; while the fuel tank is being filled, you need to fill the oil tank, which is designed to automatically lubricate the chain; You can distinguish containers by special icons; Before pouring, wipe the necks of the containers with a rag; During operation, lubricant and gasoline should not be allowed to spill, so you need to be careful when unscrewing the canister lids; When refueling, it is better to use a funnel; Care should be taken when tightening the lid with a lock; Experts advise not to fill the container completely, but to leave a little free space.
When operating a properly fueled chainsaw, you should regularly check the tightness of the containers and the operation of the motor. If the chain gets very hot, or the gas is being consumed too quickly (faster than oil), this should cause concern. Before starting work, the chainsaw is run in.
When the chain saw operates correctly, 1 gasoline tank should be enough for 30 minutes of operation of the device at maximum load. When the gasoline runs out, the lubricant still remains in the second container, but in small quantities.
Measuring containers
To maintain the correct proportion of gasoline and oil, a calculation table applied to the saw body can be used. Branded containers of leading motor oil manufacturers are equipped with built-in measuring devices that provide accurate dosage of oil for different volumes of the fuel mixture.
Measuring utensils are included in the factory kit of many budget chainsaw models. In some cases, a medical syringe with a volume of 20 cm3 will help gasoline
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