Proportions of oil for two-stroke chainsaw engines
Consequences of incorrect dosage
Many chainsaw users do not pay enough attention to proportion. 50 grams more or less. does it matter? But in vain: often the cause of saw malfunctions is operation with an improperly prepared fuel mixture. over, it is possible to make a mistake or deliberately violate the ratio both upward and downward.
and about gasoline
To say that in oil-producing and refining Russia gasoline is mostly of poor quality is to repeat the obvious. You can “get” to bad fuel not only at nameless gas stations, but also at large filling complexes with a big name. High-quality gasoline is very important for modern high-tech chainsaws. it allows them to work with maximum efficiency and minimum wear. The general requirement today is the use of gasoline with an octane rating of at least 92. It has optimal performance for chainsaws.
The old Soviet units could be filled with 76th gasoline. Today it is not worth doing this even with cheap Chinese saws. you will only hasten her “death”. It is also not recommended to go to the other extreme. to pour the 95th or even the 98th into an expensive instrument, thinking that it will be better for him.
Buyers come and ask: the better the gasoline, the better the saw? Why then not pour the 95th? After all, more advanced cars only require it.
Answer: most of the Russian 95 gasoline is the same 92nd, but with additives that reduce detonation. Chainsaw this parameter is not important, it needs the purest gasoline, since the additives are completely unnecessary. Therefore, the logic is simple: a pure 92nd is better than the more expensive 95th, but with unnecessary additives.
If there is a lot of oil
Among the owners of chainsaws, there is an opinion “you can’t spoil the engine with oil”. But it’s not for nothing that they come up with the necessary parameters of the finished mixture. Too much oil can also be harmful and inconvenient. Indeed, despite the improved combustion performance without residue, some of the hydrocarbons still turn into soot and carbon deposits. At a low concentration, there are few of them, but if you enrich the mixture with oil twice against the norm, then coking will turn out. This is especially dangerous for cheap mineral oils that do not have a “flushing” effect.
It is also highly likely that you will find oil in the air filter when the carburetor overflows. The candle will also be soaked. it will need to be cleaned, rinsed and dried. Also, vapors of unburned oil will settle in the muffler, and during intensive work they will burn out, forming a train of soot and sparks.
After such a refueling, almost all the insides of the saw will have to be thoroughly cleaned and rinsed. The funniest “surprise” will be the “dying” of the piston rings. but that’s in the case of systematic abuse of oil overflow and work under heavy load.
Gasoline and oil proportions
Very little oil is required for normal engine operation. Its amount is always determined as a percentage, since the saws’ gas tank can have different capacities. In addition, many operators prepare the mixture with a small margin, especially if there is serious work to be done. After all, one tank for modern tools, despite all the economy, is rarely enough for more than 1 cubic meter of firewood.
This is a standard due to the high quality workmanship of modern engines. It is typical for most modern saws of German, Swiss, American, Japanese, Italian production. In short, all saws produced no more than 10 years ago by world famous brands. Husqvarna, STIHL, Oleo-Mac, Makita, ECHO and others. will require exactly this proportion.
However, many purely Chinese saws are also affected by improved processing and assembly technologies. So, many saws of domestic brands, assembled in the Middle Kingdom, also operate on a mixture of 1:50. For example, on the recently released Zubr models, a label with proportion markings appeared in the form of a cardboard flag right on the handle of the starter cord, apparently for those who do not like to look at the instructions.
This ratio is often referred to as “break-in”. This means that after buying a new saw, you will need to pour a more oil-enriched mixture into the gas tank. At this time, the moving parts of the cylinder-piston group are rubbed in; the process requires a larger proportion than the usual one. After burning a couple of tanks in a gentle mode, you can switch to the ratio recommended by the manufacturer.
Also, the 1/40 ratio is generally accepted by some manufacturers, for example, in Partner chainsaws. Considering that there is a little more oil here than in the previous version, a slight excess of the norm will not harm any engine. When using high-quality fuel and lubricants, another question arises. the price of rather expensive consumables.
Even the owner of a chainsaw, observing the proportion to the gram, can harm his tool if he uses substandard or inappropriate components. The general recommendation is to use special fluids.
or not enough
“Greed” in the preparation of the fuel mixture killed more than one piston. This is where it is really better to “overdo it” than “overdo it”. Indeed, if in the first case you are threatened with a thorough “washing” of the unit, then in the second you will have to change the CPG, and this is generally unprofitable on many saws, but for others it costs very decent money.
Conclusion: saving is pointless. In the absence of a sufficient amount of oil, the piston begins to rub heavily on the cylinder, since at high temperatures the gasoline is too fluid to perform the function of lubrication.
The sad result: scuffed pistons, a ditched saw engine. If the owner changes his mind in time, he will find that the piston and cylinder are cast in a beautiful blue. How long such will last, no master will give a guarantee.
Two words about oil
Oil for two-stroke engines is produced mainly for gasoline-powered household tools. It is always painted in some bright color. blue, green, red, pink. This is done so that, when added to gasoline, it becomes clear that this is a ready-made mixture that can already be poured into the gas tank. Large manufacturers, such as STIHL, have several types of oils that differ in color.
If you have a saw for which an oil from the same manufacturer is recommended, follow this recommendation if you are a beginner. Only by trial and error, experienced “sawmen” find the oil that suits them best.
Fuel mixture: the proportion of oil and gasoline for the chainsaw
The chainsaw engine is the heart of the tool, so it is very important to use a properly prepared fuel mixture.
The fuel mixture for a chainsaw is prepared from two components. oil and gasoline. Chainsaws are equipped with two-stroke engines, so oil is not added to the lubrication system (like in a four-stroke engine), but directly to gasoline. At the same time, it is very important to observe the correct proportions of ingredients, of course, in no case try to work on pure gasoline, because in this way you will very quickly “kill” the chain saw.
If we talk about what kind of gasoline to pour into the chainsaw, then it will be optimal to use fuel with an octane rating of A-95, in this case the savings on fuel can turn out to be deplorable. Often European manufacturers indicate that it is possible to use A-90 or A-92 gasoline, but in post-Soviet countries the quality of gasoline is inferior to that of Europe, so in our realities it is better to use better quality gasoline.
As for the proportion of the petrol-oil mixture itself, everything is simple here: you must follow the instructions for the tool. All manufacturers of chainsaws indicate the required ratio in the instruction manual or in the passport of the tool, in addition, the proportions for refueling the chainsaw may differ depending on the model of the chain saw. 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 we get 25 ml of oil. If you follow the same steps to a ratio of 1:50, you get 20 ml of oil per 1 liter of gasoline. As for budget chainsaws made in China, the situation is slightly different. The ratio of gasoline to chainsaw oil made in China 1:25, that is, divide 1000 ml of gasoline by 25, we get 40 ml of oil. The thing is that in branded chainsaws, a solid assembly and the distance between pistons and cylinders in the engine is much less than that of Chinese chainsaws, therefore, the required amount of oil differs almost twice.
Use a conventional medical syringe with sufficient volume to measure the correct amount of oil.
Another subtlety. first fill the dry gasoline can with gasoline and then oil. The procedure, on the contrary, is fraught with a poor quality fuel mixture, because the oil is denser, it will stick to the bottom of the canister. what a good mixing here.
Be sure to prepare the fuel mixture in a canister and pour ready-made special fuel into the gas tank! Never cook or mix directly in the fuel tank of your chainsaw!
If you figured out the question of how to breed gasoline for a chainsaw, then on storage conditions and shelf life of the fuel mixture it is worth saying a few words. It is best and easiest to prepare a petrol-oil mixture for 1 liter of gasoline, it is recommended to do this immediately before working with the tool. Chainsaw fuel tanks have a volume of 0.3 to 1 liter. In the conditions of domestic use, the entire volume of the prepared combustible mixture is rarely used in one session, 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 count that the shelf life of the finished mixture will be 7-10 days. The fact is that the oil on the market now is not synthetic, but organic, that is, natural. After 10 days, all lubricating properties are lost, gasoline simply “eats up” 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 will stall (so that the saw has a dry carburetor) and now you can leave it until the next operation.
Unsuitable fuel mixture must be disposed of.
Preparation of a mixture for processing a chainsaw
Before using the equipment, the proportions of gasoline and chainsaw oil are determined.
Before diluting gasoline with chainsaw oil, you need to prepare a special canister. Plastic and glass bottles will not work, and you should also not pour the product directly into the tank. To find out how much oil per liter of gasoline you need to pour into the grass trimmer, the easiest way is from the instructions attached to the equipment.
Fuel must be stored for up to one month. Then the mixture is oxidized, due to which its properties change.
Ratio of gasoline and grass trimmer oil
Regardless of what type of equipment you plan to use, you need to choose the right proportions and prepare the fuel mixture. The most common question: how to dilute gasoline with chainsaw oil and not be mistaken.
A suitable product must be purchased before filling the fuel tank. Unleaded fuel is best for gardening equipment. It is ideal for such mechanisms. Before buying fuel, you must study the factory instructions for the equipment.
It is recommended to fill the petrol brush or other equipment with a product with an AI-90 or 92. After it became clear how many liters of gasoline you need oil, the chainsaw is refueled and used for its intended purpose. It is best to purchase proprietary formulations of the API TB class. They are suitable for use at positive air temperatures.
When trying to figure out how much oil to add to your chainsaw gasoline, you should look at the average proportions. Most often, dilution is carried out at a rate of 1 to 50.
Also, it is important to determine the total volume, then it will become clear how much oil to pour into gasoline for a chainsaw. For single work using special garden equipment, filling per liter is sufficient. If the tool is used regularly, then the average volume is 3-4 liters.
Powerful chainsaw consumes a lot of fuel
Proportion of oil and gasoline for outboard motor
Two-stroke motors for a boat must be filled with a homemade solution of two types of fuel. To find out how much oil to add to petrol for a grass trimmer or motor, you need to consider the steps of the equipment:
- initial run-in. dilution 1:25 is required;
- long-term work. 1:50;
- short period of work. 1:40.
After the original packaging is opened, the properties are retained for six months, however, the manually prepared mixture is stored for no more than a month.
The manufacturer should always indicate in the instructions for the motorboat which solutions are suitable for a particular model. To find out how much oil to pour into gasoline for a grass trimmer or outboard motor, you need to look at the factory documents.
It is recommended to have a supply of mixture in a canister while sailing in order to refuel the engine if necessary.
How to prepare a fuel mixture. the rules and features of the process
Before you mix the oil-gasoline solution, you need to find out the exact proportions. The operation of any device, including a chainsaw, must be carried out exactly according to the instructions attached by the manufacturer. The technical document states how much oil to add per liter of gasoline.
To mix gasoline with grass trimmer oil, you need to study the specifications of the device. If the distance between the pistons and cylinders is large, it is more difficult to maintain the normal operation of the mechanisms. Primary compounds are poured into a container for mixing gasoline and oil using a large medical syringe or any other convenient method.
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To dilute gasoline 1 to 50, you need to know for sure how much will have to be filled.
It is not recommended to mix oil and gasoline in the fuel tank
A mixture of gasoline and oil for two-stroke engines
When buying equipment, you should study the instructions. in it, the manufacturer can recommend the best way to prepare the fuel mixture. For air cooled models use a 1:40 mix. Equipment that uses synthetic oil is best suited for fuel diluted 1:50. It is necessary to select the desired option in each case for a specific device.
Work is carried out in high-quality and dense gloves
After the ratio of oil to gasoline for the grass trimmer has been determined, you can refuel the device.
It is better to pour liquids into the tank in the fresh air, and not in the garage.
Recommendations for mixing and filling the gas tank:
To find out how to dilute gasoline with grass trimmer oil, you need to study the instructions for the device.
Always check the expiration dates of gasoline and oil
Oil to gasoline ratio
Depending on the model of equipment and the type of engine, filling with gasoline and oil is carried out in different proportions. It is important to make the right choice so that the working mechanisms serve as long as possible.
Before mixing gasoline with grass trimmer oil or chainsaw oil, you must determine the required amount of one and the other fluid. The ratio of gasoline to chainsaw oil can be different: 1:50, 1:40 or 1:25.
Manufacturers offer a huge amount of funds
The amount of gasoline must be determined in liters, and the oil is calculated in ml.
The principle of operation of a two-stroke engine
Each manufacturer of gasoline and fuel oils gives recommendations on the use of products. In order for the chainsaw to work at full power, it is necessary to determine the required proportions: 1:50 (oil to gasoline). how much it is, it is important to choose the correct ratio.
On the reverse side of the package, as a rule, instructions for the use of fuel are attached.
The easiest way to find out how to mix 1:50 (oil to gasoline) is to use the data in the table:
|Proportion view||The amount of gasoline, l||Oil amount, ml|
Before filling the equipment, you need to correctly calculate the amount of each product.
When preparing the fuel fluid, the total volume in liters is calculated
Gasoline and refueling oil sold separately
Oil to gasoline ratio for two-stroke engines
Before starting work with the unit, it is necessary to prepare a fuel mixture. Regardless of what brand of gasoline is used, you must use one part of the liquid, mixed with oil.
Standard indicators when mixing compounds. 1 to 50
For five liters of gasoline, no more than 100 ml of oil is used. The exact amount is determined depending on the size of the equipment. Compliance with this ratio allows you to avoid the formation of carbon deposits on the motor elements.
It is recommended to use special measuring containers for mixing. After combining, the liquids should acquire a uniform shade: brown, yellow or red.
To store gasoline, you need to use special canisters, but not plastic bottles. Gasoline eats away at plastic quickly.
The ratio of gasoline to chainsaw oil
Household and professional chainsaws are powered by two-stroke internal combustion engines operating on a metered mixture of gasoline and engine oil adapted to the difficult operating conditions. The correct proportions of oil and gasoline for a chainsaw is one of the important conditions for stable traction characteristics of the engine and low-cost development of its assigned resource.
The need to obtain a sufficiently high power from a small-cube power unit makes it necessary to operate chainsaw engines at high-speed modes, therefore, increased requirements are imposed on the quality of both components of the fuel mixture.
Benefits of branded oils
Many domestic and foreign manufacturers specialize in the production of special motor oils, but the highest rating indicators are for branded products from STIHL, Husqvarna and Makita.
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Only in certain parameters are the domestic motor oils of the Lukoil trademark inferior to the branded assortment.
The list of advantages of branded engine oils includes:
- economical consumption;
- stability of performance under difficult operating conditions and during long-term storage;
- minimum amount of toxic compounds in exhaust gases;
- almost complete absence of carbon deposits.
According to the American classification, API-TB oils can be used for work in household and professional models. The Japanese counterpart is JASO-FB and JASO FD. Preparation of a combustible mixture using oil for 4-stroke engines is strictly excluded.
Red, green or any other color of oil determines the product belonging to the assortment of a certain manufacturer, therefore, when determining the characteristics of the material, it is not taken into account. Be extremely careful when choosing a motor oil of unknown composition and origin.
Until you receive additional information about the quality and operational parameters, it is better to temporarily refuse to use such material.
It is allowed to mix motor oils of the same type in composition and purpose, produced by brands known for the quality of their assortment. Under no circumstances is it allowed to mix mineral and synthetic oils.
Working proportions of the fuel mixture
The standard gasoline to oil mixture ratio for carburetor chainsaw engines of various models is 40: 1 and 50: 1. This proportion provides full lubrication of the rubbing parts of the crank mechanism and piston group, and also does not prevent the complete combustion of the gasoline-air mixture.
Taking into account external factors, the fuel mixture can be adjusted in the direction of increasing the amount of oil. Such a need arises at the stage of running in a new tool, as well as at high air temperatures. In this case, the standard oil dosage is increased by 20%.
In practice, an increase in the percentage of oil in the fuel mixture is used if its characteristics do not fully meet the stated requirements. How much oil per liter of gasoline is needed in each case is determined by the sawman himself.
Stricter criteria for the selection of the oil component. In the best variant, it is a mineral or semi-synthetic engine oil recommended by the manufacturer, intended for operation in high-speed two-stroke air-cooled internal combustion engines.
The advantage of mineral oils is their lower cost. Their more expensive semi-synthetic and synthetic counterparts are distinguished by improved performance and compliance with environmental standards.
- maintain working properties in a wide range of operating temperatures;
- do not form carbon deposits;
- contain detergents, antioxidants, preservatives and other additives useful for the operation of the power unit.
To maintain the correct proportion of gasoline and oil, the calculation table printed on the saw body can be used. Branded containers of leading manufacturers of motor oils are equipped with built-in measuring devices that ensure accurate dosage of oil for different volumes of fuel mixture.
Volumetric utensils are included in the factory set of many models of budget-category chainsaws. In some cases, a 20 cm3 medical syringe will help to dilute gasoline with oil in a given proportion.
It is better to prepare the mixture in an amount that should be enough for one-time work. The problem lies in the irreversible deterioration of the working properties of the mixture during storage. The finished composition is recommended to be used over the next few days.
A mixture of gasoline with a month-old oil impairs the traction capabilities of the engine. There is also the formation of resinous compounds in the fuel system and intense carbon formation in the combustion chamber, loss of mobility of the piston rings.
- With minimal damage to quality, it is advisable to store gasoline with oil for no more than 2 weeks. At an ambient temperature of 25 degrees Celsius or more, this period is reduced to 8-10 days.
- In order to save money, the expired mixture can be gradually consumed by mixing it into the fresh composition in an amount of no more than 10% of the total volume.
In order to avoid problems associated with the failure of the fuel system, it is recommended to filter the prepared mixture through a non-fiber material such as suede, or a fine-mesh twill weave, a metal mesh.
Dosage of oil in the Chinese version
Many chainsaws of the Chinese assembly are simplified copies of popular models of European design. The lack of special materials and proprietary technologies contributes to the preservation of the outdated proportion of gasoline and oil in a ratio of 25: 1.
The doubled consumption of engine oil is compensated by its lower cost. According to the developers, original components are introduced into the composition of Chinese oils, contributing to the increase in the durability of power units and the real extension of their assigned resource.
According to independent experts, the quality of the best brands of Chinese motor lubricants corresponds to those of European manufacturers in the middle price range. This is the level of branded motor oils of the Standard group and partially. Super.
How much oil per liter of gasoline to pour into Champion chainsaws
For its chainsaws, Champion recommends the use of Champion 2-stroke, high-speed, air-cooled ICE oil. Proportion 1:50, that is, for 1 liter of gasoline 20 ml.
In addition to the branded Champion, it is allowed to use oils for the same engines of other brands. over, it must comply with API TV / C or JASO FC / D standards, which must be indicated on the canister label.
The ratio of oil and gasoline for chainsaws of famous brands, the correct proportions, and also what should not be diluted
The preparation of the fuel mixture is a very important process, both the consumption of gasoline and the service life of the chainsaw depend on the observance of the correct proportions of gasoline and oil. Many are accustomed to stirring 1:50, but this is not correct, because the ratio of these two components is different for all manufacturers. Within the framework of the article, we will figure out what the most famous manufacturers recommend to fill in, in what proportions, and also give an example of how to dilute and prepare fuel correctly.
The ratio of oil and gasoline for Partner chainsaws, in particular Partner 350
For his saws, including the 350, Partner recommends using 1:40 Talon branded oil, which is 1 part to 40 parts gasoline.
In order to calculate the need for 1 liter (1000 ml), 1000 should be divided by 40. The result is 25 ml per 1 liter (1000 ml) of gasoline.
There is no information in the instructions of this manufacturer about the permissible replacement of the recommended Talon oil with others. In practice, oils are used for air-cooled two-stroke engines and other brands. In this case, the proportions are already recommended by the oil manufacturers and are indicated on the canister.
Pay attention to the canister, inscription 1:40, this once again confirms that each oil has its own recommended mixing proportions with gasoline
How to thin for STIHL, in particular for the MS 180
The manufacturer recommends for the engines of its chainsaws, including the STIHL 180 MC model, HP Ultra oil in a ratio of 1:50. It provides the highest power, service life and cleanliness of the internal combustion engine. It is also recommended to use engine oils in STIHL labeled containers. It is important here to purchase original, but not counterfeit products.
A mixture of gasoline with some oils is considered perishable, it is recommended to use it no later than 10-30 days after preparation.
In the case of a mix of oil and gasoline recommended by Calm, this is not the case. The mixture can be stored for up to 2 years. After long-term storage, the container must be shaken to mix possible sediment.
Motomix. STIHL ready-mixed fuel mixture, very convenient when there is no time or opportunity to mix fluids on site
Refueling during running-in
When running in, all rotating and mating assemblies and engine parts are rubbed in. In some places, increased friction is possible, which can be stopped by additional lubrication.
In the operating instructions of most models and brands, there is no specific indication of the amount of oil for the break-in period. But many experts, with many years of experience, recommend pouring 20% more during running-in.
For example, if a ratio of 1:50 (20 ml per 1 liter) is indicated for a specific chainsaw, then another 20% should be added, that is, a fifth. 4 ml. As a result, pour 24 ml per liter.
The break-in period is approximately 10 engine hours. During this time, a small excess of oil will not do any harm. However, the running-in will take place in a more gentle mode, which in the future can increase the engine resource.
Can I mix oils of different colors and brands??
It is not recommended to mix oils of different brands. First, they can be performed on a different, incompatible basis. synthetics, semi-synthetics, mineral. Secondly, different brand oils may contain different additives. How they can chemically react with each other and what is formed as a result, it is impossible to predict.
The main thing is that there is simply no need to do this. It is more rational to add the rest of one brand of oil to gasoline and work out a mixture. And then start using another oil.
Pay attention to the labels, these are 3 different oils from STIHL, all differ, both in characteristics and in color. They cannot be mixed with each other, as the manufacturer himself writes about in his instructions.
How to dilute gasoline with Huter saw oil
The manufacturer Huter does not allocate any one brand of oils for its chainsaws. There are recommendations for the general type. oils of the JASO FC classification or others: API TV, API ТС, JASO FB for two-stroke air-cooled internal combustion engines.
If the oil does not meet these standards, then problems and engine breakdowns may occur due to poor-quality lubrication.
In the instructions for use, Huter does not himself name the proportions, but indicates that the mixture is formulated in the proportion indicated by the oil manufacturer.
For example, if the canister reads 1:50, 20 ml is poured per 1 liter of gasoline. If 1:40 is specified. 25 ml per 1 liter.
For all chainsaws, unleaded gasoline with an octane rating of at least 90 is used. That is, AI-92, AI-95, AI-98. over, the most common and suitable option is AI-92. Gasoline with octane numbers 95 and 98 is recommended in cases where the engine runs mainly at high revs. We also recommend reading in more detail about the choice of gasoline.
An example of preparing 1 liter of a mixture in a ratio of 1:50.
- The capacity is approximately half (0.4-0.6 l) filled with gasoline.
- Pour 20 ml of oil into a clean liter container.
- Close the lid, shake the fuel until it becomes uniform in color.
- Gasoline is added to a liter, the lid is screwed on, the container is turned over several times.
Gasoline already diluted with oil mixes very easily with refilled clean gasoline, therefore, it is not necessary to mix strongly again.
The oils are painted in different colors, red or green. Therefore, by the uniformity of the color of the mixture or clots of different colors, you can clearly see whether the oil has stirred or not.
When oil overflows, the engine emits smoke. But smoke immediately after a cold start is in most cases typical for cold engine operation. After a few minutes of operation and warming up of the combustion chamber, the smoke disappears.
Gasoline and oil proportions
There is no definite answer to the question of how much oil is required per liter of gasoline. For each gasoline two-stroke engine, taking into account the power and the period of use, its own proportion is provided. The operating instructions indicate indicators, while the ratio during the running-in and subsequent operation is different.
For example, for garden equipment. mowers (grass trimmers), chainsaws, the proportionality of continuous operation is 1:50, running-in 1:40. The proportion of oil and gasoline for a boat motor is also individual: 1:25. running-in, 1:40. short period of work, 1:50. long-term operation. For motoblocks, cultivators, more oil is needed: 1:20. running-in, 1:30. constant operation. Motorcycles, scooters will need even more oil. Here, the proportions during running-in will be 1:15, and in the future, a fuel mixture of 1:20 will be required.
The position that the more oil, the better or according to the principle “it will not be worse” is not relevant. Increased concentration will cause increased engine wear as a carbon deposit will form. The proportion must be accurate. For convenience, a two-stroke fuel mixing table is used. It contains indicators that allow you to determine the need for gasoline and oil for the preparation of a certain amount of fuel, taking into account the required proportion.
The ratio of oil to gasoline for two-stroke engines: features and recommendations
Nowadays, gas powered tools, motor boats, scooters and motorcycles are not a luxury. This is a common technique that everyone has. One of the distinguishing features of such equipment is a two-stroke gasoline engine.
Unlike four-stroke ICEs, where the lubrication system is provided separately, in two-stroke engines, refueling is done by mixing gasoline with oil. It is important to respect the proportions, the prohibition of refueling clean fuel without adding oil. Otherwise, a decrease in the service life of the engine, which will result in frequent breakdowns and short-term failure.
Features and principle of operation of a two-stroke engine
The advantages of a two-stroke internal combustion engine are ease of maintenance and repair. Its resource is higher than that of a four-stroke. Increased service life is achieved by reducing the number of piston movements.
The working cycle is completed completely in one revolution of the crankshaft. These are two strokes: compression and working stroke. Unlike a four-stroke ICE, there is no fuel mixture intake phase and no exhaust cycle. In a two-stroke, the process of fuel intake and exhaust gas exhaust is carried out during compression and expansion, i.e. in the course of one revolution of the crankshaft.
Thanks to this system, the torque and power of a two-stroke engine is higher than that of a four-stroke engine. Specific power with the same engine cubic capacity can exceed a four-stroke engine by 50%.
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Mixing oil with gasoline
All work with fuels and lubricants must be carried out in compliance with safety measures, namely:
- use of gloves to keep oil and gasoline particles out of the skin;
- mixing is carried out outdoors to prevent the accumulation of gasoline vapors;
- it is forbidden to work near open flames, heating devices or smoking.
In addition to safety measures, you should be careful with measuring containers and funnels. Everything must be clean. It is necessary to exclude any ingress of dust, debris, water into the finished fuel mixture. Otherwise, such a refueling will lead at least to clogging of the carburetor and other fuel supply elements.
A measuring cup is used for mixing. This can be a separate container with a measure or a special compartment on a bottle of oil. In any case, first, the amount of oil and gasoline is prepared, taking into account the required proportions. Then the oil is poured into gasoline and mixed. The fluid should take on a uniform shade depending on what color the lubricating fluid was. blue, red, green. The fuel mixture for the two-stroke internal combustion engine is ready.
You cannot mix the components directly in the gas tank of the equipment. Cooking takes place only in a separate container.
Oil selection for two-stroke internal combustion engines
For a two-stroke engine, you must purchase branded API-TB or API-TC oils. In the instructions for the equipment or gasoline tool, the recommended oil brand will be indicated, which is also subdivided by viscosity and characteristics:
- mineral. for warm weather;
- semi-synthetic. mineral oils with improved qualities for all-season weather;
- synthetic. used in more severe times at low temperatures.
When purchasing oil, you must be guided by how much mixture you need for technology. If you plan to use a lawn mower, then 1-2 liters are enough for the season. If it is a scooter or a boat motor, then the amount will be required much more. Based on the instructions, you can make the correct calculation of fuel in advance.
Why you need to mix gasoline with oil
When the parts are mated, they are lubricated, because the mixture consists not only of a combustible part, but of a lubricating component. This is why the use of clean fuels is not recommended. The engine will work, but in the absence of lubrication, the piston system will quickly fail, fail.
Therefore, mixing gasoline with two-stroke oil is essential for the following reasons:
- increasing the service life of the internal combustion engine;
- elimination of the formation of scuffing elements of the piston group;
- preventing jamming of mechanisms, engine parts during overheating;
- ensuring effective lubrication of rubbing parts;
- preventing all kinds of breakdowns during operation.
Preparation of the mixture
The fuel mass ratio must be accurate, calculated according to the manufacturer’s recommendations. It is not recommended to dilute “by eye”, because an insufficient amount of oil in the mixture and its excess will also lead to engine breakdown. For mixing, you need to choose the type of fuel, the brand of lubricant and how much oil you need to pour into gasoline.
To prepare the fuel mixture, unleaded gasoline of grades not lower than AI-90 is used. Previously, AI-80 was used for this, which was cheaper than the others, but over time this type of gasoline left the fuel market. The AI-92 was the best option. You cannot use fuel that is not recommended by the manufacturer for a particular engine. It will incapacitate him quickly enough.
When refueling, storing gasoline, a number of recommendations must be taken into account. You must not pour gasoline into plastic containers, because:
- This can cause a fire, because plastic is a material that can generate static electricity when rubbed.
- Gasoline destroys plastic on contact. Its microparticles get into the fuel, which leads to the preparation of a poor-quality mixture for a two-stroke engine.