- March 14, 2019
- Svetlana Pavlova
One of the important indicators of the durability of chainsaws and their quality work is the correct observance of the ratios of the constituent liquids when preparing the fuel mixture. It is known that an insufficient amount of oil leads to excessive friction of parts and their rapid wear, and excess. to the appearance of soot, overheating of the engine. This article will discuss the proportions of oil and gasoline for the Stihl chainsaw. This is especially important for beginners who have just purchased a tool.
Each chainsaw has three main elements that ensure its operation. These include a 2-pin carburetor engine and two tanks. The fuel mixture is poured into one, the oil necessary to lubricate the chain in the other. The volume of the fuel tank is 0.25 L, which allows you to work without stopping for 45–55 minutes. The volume of oil is less than about half. With this ratio of volumes, the contents of both tanks end almost simultaneously.
When operating 2-stroke engines, the oil pump system is not used, therefore, for the Stihl chainsaw, oil in gasoline has to be added to lubricate the shaft, piston and other rubbing parts. Attempts to work on one gasoline or non-observance of the proportions specified in the instructions for compiling a fuel-lubricant mixture of two components, lead to a breakdown of the tool.
Most often, in the preparation of fuel for sawing, proportions of 1:50 and 1:40 are used. This means that 50 or 40 parts of gasoline add one part of the oil. The calculations are carried out as follows: 1 l = 1000 ml, 1000/50 = 20 ml or 1000/40 = 25 ml, that is, in the first case, pour 20 ml in each liter of gasoline, and in the second 25 ml of oil. If there is no instruction and you do not know the proportions for the preparation of the mixture, then use the following recommendations:
- Tool and oil of the same brand. For example, for a Stihl chainsaw, the ratio of Stihl gasoline to oil will be as indicated on the container with oil, usually 1:50.
- The substances used for the mixture have different brands. the ratio is 1:40.
- There is only one brand, but there is no information on the ratios of substances on oil. they breed 1:40.
- In the absence of any data on saw and oil, the mixture is diluted in a proportion of 1:40. The only thing you need to make sure that the oil is designed for two-stroke engines.
To run a new saw in the first three refueling tank with fuel oil add 20% more. In this case, instead of the ratio 1:50, it will be 1:42, and the proportion 1:40 turns into 1:33. A liter of gasoline will require 24 or 33 ml of oil, respectively. Other break-in events with a new saw are not carried out. Manufacturers are advised to work only at the highest speeds ever. After running the tool, the usual proportions are 1:50 or 1:40. In some cases, the manufacturer of the equipment indicates other ratios, for example, 1:25 or 1:32, they must be observed.
What kind of gasoline to fill in a chainsaw?
According to experts, you should use unleaded gasoline, obtained by adding lead-free additives, the octane number of which exceeds 90. For foreign models, it is necessary to fill gasoline of higher grades and use branded oils of the tool manufacturers. Perfect considered fuel grade AI-92. How to breed gasoline for a chainsaw "Stihl 180"? In this case, the oil content in the mixture is 1:40. AI-95 fuel is quite suitable for it, but according to professionals, it is better not to use it for chainsaws.
The fact is that it is manufactured on the basis of AI-92 using certain additives that change the quality of the fuel. These components are deposited on the internal parts of the instrument and, upon reaching a critical mass, begin to exfoliate, disrupting the operation of the mechanism. The best option is to follow the instructions that come with the selected model. Gasoline is recommended to be used fresh, because during prolonged storage in containers, octane properties are lost.
Stihl chainsaw: which oil to use for gas?
A number of manufacturers producing equipment also produce their own consumables that are adapted to the operation of a particular engine. So Stihl also produces oil exclusively for its technology. It is equipped with special additives that can compensate for the quality of the fuel, improving the 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 a temperature not lower than 10 degrees.
As well as for two-stroke engines, products of the following brands are used: Sadko, Kraissmann, Oleo-mac Prosint. If you use a Stihl chainsaw, how much oil per liter of gasoline needs to be poured? The ratio will be 25 ml of additive per liter of fuel. It must be remembered that there are oils for chains and motors. They are designed for different purposes and are not interchangeable. The use of chain oil for the preparation of a fuel and lubricant mixture leads to breakage of the tool.
Which brand to use motor oil?
For each model, the manufacturer advises a list of materials that must be used. It is better for the user to adhere to these recommendations, because the breakdown of the instrument due to inappropriate fuels and lubricants does not cover the warranty. In this case, the owner himself pays for the repair of the chainsaw, which can be up to 80% of its value. When it is not possible to follow the manufacturer’s recommendations, try to follow these rules:
- Use oil designed for two-stroke engines only.
- Do not use after expiration date.
- Do not add used oil with a large amount of impurities to gasoline, as the tool mechanisms may be damaged.
- Chain lubricant must not be used for the fuel mixture.
- It is preferable to use synthetic and semi-synthetic oils, which are more expensive than mineral, but do not form harmful deposits.
How to make a mixture?
In order for the equipment to serve for a long time and properly cope with its functions, you need to know exactly how much oil you need to add to the Stihl chainsaw gasoline. Earlier, we found out that it is better to use a lubricant product from the manufacturer Stihl and unleaded AI92 or AI95 gasoline as components. Leaded grades of fuel adversely affect the operation of the unit and disable it. With these components, 20 ml of oil is added to the liter of gasoline for the mixture. Any violation of the proportions leads to the appearance of soot on candles and pistons, as well as the formation of scoring. The oils used may be green, blue or red.
By the color of the mixture, their presence is easily determined. To dilute the fuel, often complete with equipment, a special canister is attached. These tanks are marked with graduated divisions and there are two holes. It remains for the user to fill the tank with the mixture components to the required marks, close the lids and mix. Some use plastic bottles and syringes for measuring oil for these purposes. In this case, it is necessary to ensure that foreign particles or water do not get into the tank, all this will worsen the operation of the engine.
What will happen if you do not take into account the manufacturer’s recommendations?
In violation of the rules for the preparation of fuels and lubricants and non-compliance with the proportions when adding oil to gasoline at a chainsaw "Stihl 180"; The following problems occur:
- With increasing friction, the wear of the working surfaces of the parts will increase.
- Due to insufficient lubricant, the bearings will begin to break down.
- The full functioning of the mechanical components is disrupted due to the premature wear of parts, their service life is significantly reduced.
- When using low-grade grades of gasoline and oils, the performance of the unit decreases with the subsequent breakdown of important components and parts.
Fuel is prepared before refueling the saw, avoiding excessive contact with oxygen. After completion of work, the remaining mixture must be drained.
Shelf life of the finished fuel mixture
Motorists know that it’s not worth storing gas for a long time, and the finished fuel mixture deteriorates even faster. Mix the necessary proportions of oil and gasoline for the Stihl chainsaw before starting work. Manufacturers allow storage of finished fuel for up to one month, and experts recommend that this period be reduced to 10 days. Immediately after mixing, the solution begins to lose its original properties and over time it becomes completely not of the same quality as it was prepared. Learn how to prepare so much fuel for a saw so that it can be spent at a time. It comes with experience. Keep the mixture in a gasoline-resistant opaque tightly closed container. For this, any metal plastic canister for combustible materials is suitable. They also use an oil container or glass containers made of dark glass.
Chain oil selection
In addition to the motor, for which all the proportions of oil and gasoline for the Stihl chainsaw have already been figured out, there is another important part, consisting of many moving links. a chain. To lubricate it, use not motor, but chain oil. It has completely different properties and is cheaper.
Video: How Much Oil Is Stihl 180
For a new tool, use only the oils of the manufacturer, which are recommended in the instructions. Otherwise, if a saw breaks down, it will be removed from warranty service due to non-compliance with operating conditions. It should be noted that the oils from the manufacturer are really high quality. After the warranty period, you can use any engine oil, making it replaced twice a year.
Customer reviews of Stihl saws are mostly positive. It is light in weight and affordable. Some complaints are found on the small power of the instrument. But for periodic use at home, it is quite suitable. And if you use the right proportions of oil and gasoline for the Stihl chainsaw, then it will last for many years.
The chainsaws of various companies are based on a two-stroke internal combustion engine, which drives the cutting headset of the tool. To activate the internal combustion engine, the proportions of gasoline and chainsaw oil are used. Combining gasoline with oil is a must, so if you just bought a tool, you need to understand the features of its refueling.
Why gasoline is mixed with oil for refueling chainsaws
Dilute gasoline with oil to avoid failure of the internal combustion engine. The reason for this is the design features of the lubrication system of two-stroke engines. In the design of such engines there is no chamber for filling engine oil, and if fuel is filled without lubricant, the crankshaft, piston, bearings and connecting rods will not receive lubrication. This will significantly reduce the service life of all of these parts, therefore it is forbidden to fill clean fuel.
Gasoline and chainsaw oil must be filled in appropriate proportions, which makes it possible to effectively lubricate rubbing parts. Lack of lubricant or its excess will lead to negative consequences in the form of carbon deposits. In order for the tool to work properly, you need to refuel it not only with high-quality materials from the first day of operation, but also observe the correct proportions.
For the engine to work properly, the main thing is to fill in clean fuel without pollution.
The ratio of gasoline and oil for chainsaws
The proportions of oil and gasoline for refueling two-stroke engines of chainsaws of different brands is 40 to 1 or 50 to 1. This ratio is standard, which is used not only by beginners, but also by experienced filers. It is this ratio for the preparation of the fuel mixture that is close to ideal, and provides lubrication of the rubbing parts of the crank mechanism and piston.
How much oil do you need to pour in gasoline in milliliters? Per ml ratio of oil and gasoline 1 to 50 is 20 ml per 1 liter. In order to prepare the right mixture, pour 1 liter of gasoline into a plastic bottle and dilute it with 20 ml of oil. To correctly measure how much oil to pour, you should take a special measuring container and fill it to the appropriate mark. If it is immediately planned to prepare 2 liters of fuel, then 40 ml of lubricant must be added to this amount of gasoline.
There are other ratios offered by different manufacturers. These values of the ratios differ slightly, but if you subtracted other values in the passport to the tool, then you need to stick to them. Values of 1 to 50 or 40 are standardized. Pour 15 ml of oil per 1 liter of fuel in the summer, and in the winter add at least 20-25 ml. Knowing the recipe for the preparation of the mixture, you should also figure out the question of which gasoline to pour into the chainsaw?
Gasoline and chainsaw oil. which is better
Often, beginners ask, which is better to take gas for your tool? In order not to make a mistake in the selection, it is recommended that you read the instructions for the tool. In the instructions, each manufacturer indicates the corresponding brand of fuel. If the manufacturer indicates that the octane should not be lower than 95, it is not recommended to pour 92 gasoline.
Engine oils for two-stroke engines are produced by such manufacturers:
Usually, the ratio is indicated on the bottle with lubricant, so it will be difficult even for beginners to get confused with the preparation of the fuel mixture. Under no circumstances should you use refining even as chain lubricant. This will lead to the fact that soon it will be necessary to carry out tool repairs.
Instructions for refueling a chainsaw
Knowing the ratio of the preparation of the benzo-oil mixture, you can proceed to refuel it. The fueling instruction is as follows:
- First you need to prepare the mixture. Combining the two main components, mix them thoroughly.
- Place the tool on a clean and even surface. Before unscrewing the gas tank cap, it is necessary to clean or blow off sawdust, dust and dirt
- The neck of the tank should look up
- Install a small watering can in the neck, then pour fuel
- Control the refueling process, as the tank volume is small, so it quickly fills up
- Fill up to a full maximum, as when you close the tank lid, the remaining fuel will splash out
- After the fuel is poured into the tank, immediately add lubricant to the chain
- Fuel consumption and chain lubrication are approximately the same, therefore both tanks must be refilled
- After refueling, you can start to start the engine
It is better to start the engine not at the place where the refueling was carried out, but to move to a distance of 2-3 m. The tool is ready to work, and you can start to start it. How the chainsaw engine starts can be found in this material (link).
What will happen if you pour mining into a chainsaw
If you do not want your chainsaw to fail at the wrong time, use only high-quality fuels and lubricants. It is forbidden to mix mining with gasoline. The reasons for this are the following factors:
- Another viscosity of the material, so mining is not able to provide effective lubrication of rubbing parts and mechanisms
- The mining contains small metal particles and chips, which, falling into the tank, will lead to clogging of the fuel filter and channel. If grease enters the cylinder with small particles, they will leave their mark in the form of accelerated wear on the piston rings
- Emission of a large amount of black smoke, which indicates the burning of oil
Surrogate materials cannot be poured not only into the tank with gasoline, but also into the tank for chain lubrication. What will happen if you use mining in the tank to lubricate the chain, you can see in the video.
Using the instructions, you can independently prepare the correct fuel mixture, on which the chainsaw will work. With improper dilution of the fuel mixture, not only the tool life is reduced, but its performance is also reduced.
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 refueling, attention should 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 a Stihl chainsaw is the key to a long and successful operation of this unit.
The first question 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 filled 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 issue 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 the chainsaw engine.
At the same time, a good 95 can harm the piston system. “burn” it. Thus, some users have found a way out: refuel the chainsaw with AI-92 gasoline mixed with AI-95. Thus, an optimal balance is achieved 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 the chainsaw with the oil specified in the instructions for this model.
In no case should you use oil intended for low-speed engines (boats, scooters, etc.).
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 guarantee, 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 motor oil for your tasks depending on the model of the saw and its frequency of 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 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.
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 unit’s power 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).
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 precisely 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 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 cap (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 (more precise saw characteristics can be seen in the instructions). Thus, it makes no sense to prepare the mixture in volumes exceeding 3 dressings in a row.
Before starting to prepare 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.
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’s 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 remnants 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 the device and to extend its trouble-free and trouble-free operation.