How much to pour oil into gasoline for lawn mowers

Oil selection and fuel mixture for lawn mowers

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So, have you finally become the owner of a petrol lawn mower or lawn mower? And your imagination is already creating images of how you courageously cope with the dense grass. However, the dream of a “perfect lawn” remains a dream, when the question involuntarily arises: what oil to use and what are the proportions of mixing it with gasoline?

You can find a lot of information on the correct preparation of the fuel mixture on the Internet. This topic is actively discussed on forums and other thematic resources. But, despite such an active discussion, there are many inconsistencies that have to be dealt with.

It doesn’t really matter what technique is used, it could be a lawn mower. lawn mower or chain saw. they are united by one. two-stroke gasoline engine. Unlike the 4T, it does not have an oil sump. To feed it, it is required to prepare a special fuel mixture consisting of gasoline and oil. The resulting liquid is fed directly to the engine (carburetor). During use, all actively working parts are thoroughly lubricated, contributing to trouble-free operation under all operating conditions.

Lawn Mower Engine Oil

Depending on the chemical composition, lubricants are divided into the following main groups:

Mineral. They are made on the basis of oils obtained from petroleum distillates. They are characterized by high viscosity and require frequent replacement. The material is intended for low power appliances with an air cooling system. Recommended for warm weather.

Semi-synthetic. They represent a kind of “golden mean”. They are based on a mixture of mineral and synthetic oils. A similar lubricant can be used in 2T and 4T engines, gardening and other equipment with air and liquid cooling.

Synthetic. They are made on the basis of special synthetic components containing esters. They are characterized by low viscosity and long service life. They can be used all year round, regardless of temperature conditions. Ideal for challenging heavy duty equipment with constant variable performance.

Any two-stroke oil, due to its 20% solvent composition, mixes well with fuel and has the feature of complete combustion. Their second characteristic is their color, which can be green, red or blue. Of course, this does not mean that some lubricant is better, and some is worse. This is done solely so that it is convenient for the user to distinguish oil from pure gasoline.

Classification of engine oils:

The required parameters of oils for 2T engines are prescribed in the requirements of API TC JASO FC, API TC JASO FC ISO GD and API TC JASO FC E-GC. The most widely used classification systems are API. Based on this, 2T engine oils are divided into 4 large groups:

TA. suitable for household appliances with an air cooling system and an engine volume of no more than 50 cm3.

TB. used for more powerful equipment with an air cooling system and a motor volume of 50.200 cm3.

TC. used in technology with high demands for oil quality. It is a high quality lubricant for 50.200 cc two-stroke engines. Great for lawn mowers, lawn mowers, trimmers, chain saws and other garden equipment.

TD. for outboard boat motors with liquid cooling.

Most suitable material for 2T motors of API-TB and API-TC class. However, it is necessary to refer directly to the product passport, where the manufacturer indicates the brand of engine oil recommended for its equipment.

Important! For lawn mowers, lawn mowers and other 2T garden devices, a special engine oil is provided for two-stroke engines with an air cooling system and marked “for garden equipment”. Do not use lubricant for 2T engines with liquid cooling system. Also not recommended oil for outboard engines, motorcycles and other equipment.

Oil to gasoline ratio for lawn mowers: why accuracy is so important?

All of us in childhood loved to “chew”, so the process of preparing a fuel mixture is not only simple, but also interesting. First of all, it is worth considering the fact that the proportions of the mixture may be different. This depends on engine configuration, oil markings and manufacturer recommendations. The fact is that with an insufficient amount of lubrication, the cylinder and piston heat up, which leads to shallow scuffing of all rubbing surfaces and, consequently, to the failure of the cylinder. piston group. Well, in case of its excess, on the contrary, we get coking of the piston ring and the formation of a large amount of carbon deposits.

And even despite the fact that there is a generally accepted mixing ratio of 2% (for every liter of gasoline, 20 ml of lubricant). The proportions in the mixture are still recommended to be kept exactly.

How much to pour oil into gasoline for lawn mowers?

Everything is quite simple, with the correct balance, the engine runs at full capacity, all parts are thoroughly lubricated and do not wear out. As a result, we get a confidently working technique that will last more than one season.

To know how much oil to add to your lawn mower, you need to familiarize yourself with the performance of the product. Proportional ratios can be presented as follows: 1:25, 1:40 and 1:50, which means 1 part of oil for 25, 40 or 50 parts of gasoline.

1 liter of gasoline = 1000 ml

To determine the required amount of oil for a ratio of 1:25, you need 1000/25 and we will get a ratio of 40 ml.

We carry out the same actions for the ratio 1:40 and 1:50:

1:40 (for 1 liter of gasoline 25 ml of oil)
1:50 (for 1 liter of gasoline 20 ml of oil)

To ensure the correct proportion of lawn mower oil, it is recommended to use a special measuring container (not plastic). Eliminate the possibility of dirt and water getting into the fuel mixture. this may affect its quality. It is better to start preparing the mixture with gasoline. Pour it up to the required mark, then add oil. A couple of tilts of the container are sufficient for mixing. The liquid quickly combines and acquires a uniform hue, which, depending on the structure of the oil, can be red, green, blue or other. After that, a properly prepared mixture is poured into the equipment fuel tank.

Before using the equipment, make sure that the tank cap is tightly closed. If you get more fuel, then the remainder can be stored in a special canister or mixing container (no more than 14 days). It is recommended to drain the unused fuel.

Important! Be sure to follow the safety instructions. Mix fluids outdoors to prevent corrosive gasoline fumes from accumulating indoors. Wear gloves and long sleeves. Do not smoke or set anything on fire.

Petrol

RON 92 gasoline is considered the most popular type of fuel for two-stroke engines. Due to its relatively low cost, it is extremely rarely falsified. Therefore, not one hundred percent, but you can be sure of its quality. It is also permissible to use AI-95 fuel.

As for the storage of fuel, its period should not exceed 3 months. Over time, gasoline loses its properties, the resin becomes higher and a polymerization process occurs, which adversely affects the combustion chamber. The fuel mixture for lawn mowers prepared from low-quality materials settles in the form of carbon deposits, as a result of which the main components and engine systems suffer.

Recommendations for use and storage

The fuel is ready, poured into the fuel tank, the first spurt and the long-awaited start. However, if you want the equipment to work as long as possible, it is recommended to run it in for the first time. To avoid overheating of the engine, it is recommended to adhere to the average load. After the main elements of the system have been thoroughly lubricated, the load can be increased.

Certain rules should also be followed when preparing the braid for off-season storage:

Drain the remaining fuel from the fuel tank and carry out the final run until the fuel is completely depleted. Then, pause the work and make sure that the engine is completely cool.

Unscrew the spark plug carefully and add about 5 ml of lubricant. Pull the starter handle slowly to distribute the oil equally evenly inside the engine. Then, return the candle to its original state. Store equipment in a cool dry place.

Outcomes

Oil selection

Unlike four-stroke engines, Stihl 180 chainsaw oil is poured directly into the gas tank, after being mixed with gasoline. It is recommended to fill the chainsaw with the oil specified in the instructions for this model.

Under no circumstances should you use oil intended for low-speed engines (boats, scooters, etc.).

It can significantly reduce the life of the engine, and if traces of such a substance are found in the cylinder-piston group, the tool will be considered withdrawn from the warranty, that is, it will not be subject to warranty repair or exchange.

Stihl synthetic and mineral oils for chainsaws are sold in bottles or cans of different capacities: from 100 ml to 5 liters. Mineral ones have a lower cost, while semi-synthetic and synthetic ones ensure complete combustion during engine operation, i.e. no carbon deposits and a minimum of toxic compounds in the exhaust.

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In addition, synthetic oils retain their properties over a much wider temperature range, and also contain special additives that are useful for engine operation: antioxidant, detergent, preservative, etc.

You can choose an engine oil for your tasks depending on the saw model and the frequency of its use: the oil consumption during the operation of the device is low, and given the shelf life of semi-synthetic and mineral lubricants, there is a risk of simply not having time to use even a liter bottle to the end.

So with a small estimated volume of work, you can not buy a bulk canister, but limit yourself to a bottle. Only Stihl mineral greases do not have an expiration date.

What gasoline and oil is better to choose for refueling a Stihl chainsaw: a table of ratios, how to breed, proportions

The durability and reliability of a 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 grinding parts in the first few refuelings, attention must also be paid to the quality of the fuel mixture.

Professional Stihl chainsaws are equipped with two-stroke engines that require high-quality fuel. a metered mixture of high-octane gasoline and oil, designed to operate the engine at high speeds. The correct choice of gasoline and oil for the Stihl chainsaw is the key to a long and successful operation of this unit.

Gasoline selection

The first question that the user faces before starting work is what gasoline to pour into the Stihl chainsaw.

Gasoline for the Stihl chainsaw is filled exclusively with unleaded high-octane gasoline, that is, with an octane number higher than 90. If you fill it with a low-octane gasoline, it is fraught with engine overheating, piston seizure and engine failure. Therefore, it is optimal to pour AI-92 or AI-95 gasoline into the chainsaw, but here the question of fuel quality arises.

Poor-quality AI-92 may “fall short” of the declared octane number, 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 a low-octane fuel, 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 found a way out: to refuel the chainsaw with AI-92 gasoline mixed with AI-95. This achieves an optimal balance between octane number and the amount of additives.

Ratios of gasoline and oil for the Stihl trimmer

Stihl, a German manufacturer of high-quality cutting tools, produces motor mowers in addition to chainsaws. It is an indispensable tool for mowing grass and lawn trimming with ease and mobility.

a lawn mower, or trimmer, also has a two-stroke engine and is fueled with a fuel mixture. For the Stihl trimmer, a ratio of 1:50 is recommended (for 5 liters of gasoline, 100 ml of oil).

Stihl oil

Stihl produces its own oil for its tools. High quality Stihl 2-stroke oil with high lubricity.

Consider the table of the assortment of oils for chainsaws from the official site of Stihl.

Here we see two types of motor oils:

  • HP
  • mineral base,
  • has a shelf life of 4 years,
  • minimum application temperature:.10 ° C
  • available in volumes from 20 ml to 55 l.
  • HPUltra
  • synthetic,
  • has a shelf life of 4 years,
  • burns out completely in the piston group,
  • biologically safe and degrades more than 80% in 21 days,
  • low smoke,
  • minimum application temperature:.25 ° C
  • available in 100 ml and 1 l volumes.

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The manufacturer also suggests in the description for lubricants how to dilute the mixture for refueling the saw. in a ratio of 1:50.

How to breed

Stihl saws fuel 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, then the ratio will be 1:40 (i.e. 25 ml of oil per liter of gasoline), and if the power is higher than this value. 1:50 (20 ml for 1 l).

Looking at the table of proportions, we will analyze, using the example of two saws of different power, how to mix oil gasoline.

  • For the low-powered STIHL MS 180 with a 2-stroke engine, the dilution will be 1:40. The volume of the fuel tank is only 0.25 liters. In order to mix fuel with oil for one filling, we need 6.25 ml of oil for 0.25 liters of gasoline.
  • For the STIHL MS 660 heavy-duty professional chainsaw, dilute oil and gasoline in a ratio of 1:50. This model has a fuel tank capacity of 0.825 l. In order to understand how much oil to pour for such a volume of gasoline, we multiply 0.825 by 20. It turns out that 16.5 ml of engine oil is required.

In practice, of course, it is not necessary to calculate what proportion of the lubricant will be diluted in the volume of gasoline per filling. Usually, the fuel mixture is diluted in a volume of 1-2 liters, which is enough for several refuelings of the chain saw.

You need to dilute gasoline for the Stihl chainsaw in a separate canister, in no case pouring the components into the saw’s gas tank separately. These engines do not have an oil pump and the possibility of installing it, so only ready-made 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 in an ordinary canister.

It is better to observe the proportions of refueling the chainsaw as accurately as possible: excess oil will create carbon deposits on the spark plugs and pistons and provoke detonation during fuel combustion. This can shorten the engine life. In addition, the user of the saw in this case is forced to inhale the exhaust gases with unburned fractions. At the same time, excess gasoline can damage pistons due to insufficient lubrication.

Some folk craftsmen, in the absence of special measuring accessories, advise using a plastic bottle: 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.

It is better to calculate the amount of mixture for refueling in advance based on the expected volume of work and the declared consumption of this engine. The volume of the tank in most chainsaws is about 0.5 liters, a 2 kW engine will consume approximately 1.2 liters per hour of operation (for more precise characteristics of the saw, see the instructions). Thus, it makes no sense to prepare a mixture in volumes exceeding 3 fillings 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 in order to avoid the ingress of impurities: dust, water, etc. The same is done with the tank before filling the fuel: 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.

Useful Tips

When calculating the proportions, remember that it is better to pour oil a little than to save on it: only a significant excess of lubricant is dangerous with the formation of carbon deposits, and a slight excess will not harm the engine. If you do not fill it, the consequences can be more dangerous.

When mixing fuel for a Stihl chainsaw, the manufacturer recommends that you first pour oil into the canister, then add gasoline and then vigorously mix 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 the gasoline and mix.

It is better not to leave the remains of the fuel mixture in the tank in order to prolong the life of the rubber seals and other parts susceptible to chemical damage. After stopping the saw, the fuel must be drained and disposed of: during long 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 emptying the gas tank, you need to start the saw engine and let it run at idle speed until it stops on its own. this will mean that the carburetor is also rid of the remaining fuel mixture.

It is important to remember that the long-term performance of the equipment is largely dependent on the user. Saving on fuel in the case of a chainsaw can be much more expensive in the future. by out-of-warranty repairs of a broken saw or by purchasing a new unit. Compliance with the manufacturer’s instructions in most cases helps to understand the principles of the device and prolong its trouble-free and trouble-free operation.

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. In this case, 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.

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How to Choose the Right Fuel for Your Mower

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 regular 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 low quality fuel mixture, because the oil is more dense, 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.

four-stroke lawn mowers

Trimmers, driven by a four-stroke engine, have a more complex device, providing separate containers for gasoline and oil. In such units, the lubricant used in two-stroke motors cannot be used. Gasoline for a lawn mower with such a motor can be of the AI-92 or AI-95 brands. It is not recommended to use fuels with a lower octane rating, as this will lead to interruptions and further malfunctions.

The four-stroke engine is less expensive in terms of the amount of gasoline and oil, and also emits less exhaust gases.

The subtleties of refueling a lawn mower

Once the fuel mixture has been prepared, it must be carefully poured into the mower’s tank. Since gasoline is a toxic and flammable liquid, safety precautions must be taken when working with it. Namely, work should be carried out in calm weather, away from sources of fire and in a deserted place. When pouring fuel into the tank, it is advisable to use a funnel, since the spilled liquid will remain unnoticed, and when the engine heats up, it will ignite.

The fuel tank itself must be cleaned from the outside of dust and dirt before refueling. After filling the fuel mixture, immediately close it with the cap and do not leave it open, as small debris or insects can enter the hole, which will clog the filter. Pour the fuel mixture into the tank to the indicated mark, and then add, if necessary, during operation.

Store containers with gasoline and oil in a cool place away from children, sunlight and sources of ignition. In this case, the lid must always be closed very tightly.

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What petroleum products people consume the most?

Gasoline is the most consumed petroleum product in the United States. In 2019, consumption of finished motor gasoline was about 9.27 million barrels per day (390 million gallons per day), accounting for about 45% of total US oil consumption.

Distillate fuel oil is the second most consumed oil product in the United States. Distillate fuel oil includes diesel fuel and heating oil. Diesel fuel is used in diesel engines in heavy construction equipment, trucks, buses, tractors, boats, trains, some cars, and power generators. Heating oil, also called heavy fuel oil, is used in boilers and stoves for heating homes and buildings, for industrial heating and for generating electricity in power plants. Total distillate fuel oil consumption in 2019 averaged about 4.08 million barrels per day (171 million gallons per day), which was equal to 20% of total US oil consumption.

Hydrocarbon liquids (HGLs), the third most popular petroleum category in the United States, include propane, ethane, butane, and other HGLs that are produced in natural gas and refineries. Liquid hydrocarbon gases have many uses. Total HGL consumption in 2019 averaged about 3.13 million barrels per day.

Jet fuel is the fourth most popular petroleum product in the United States. Average jet fuel consumption in 2019 was about 1.74 million barrels per day (73 million gallons per day).

How to choose the right gasoline for your lawn mower. Features of refueling and fuel proportions.

For productive and long-term operation of the device, it is necessary to fill it with a suitable brand of gasoline or a fuel mixture prepared in ideal ratios. If you inattentively follow the manufacturer’s recommendations and fill the tank with an unsuitable brand of fuel, then over time the equipment will fail. This will cause the following problems:

  • carbon deposits will appear on the entire piston system;
  • candles and cylinders will become unusable;
  • the motor will constantly overheat and work intermittently;
  • the efficiency of the device will decrease.

How to adjust the lawn mower (carburetor)

Correct adjustment is the key to the successful operation of the unit in the future.

Newbies sometimes do not know how important this process is for lawn mowers and petrol trimmers, and skip it or simply don’t know how to adjust the lawn mower carburetor, believing that the factory settings are enough. However, it is not. Inspection of all mechanisms and carburetor adjustment should be carried out regularly.

Important information and tips for adjusting the gasoline carburetor in lawn mowers:

  • There are 3 screws in the carburetor: left (H), lower (T) and right (L). To get to the screws, you need to know how to disassemble the mower, or rather, how to get to the carburetor. This information must be indicated in the product data sheet.
  • The lower screw (T) is responsible for idling, the right (L) for the amount of fuel supplied at low speeds to the combustion chamber, and the left (H) is responsible for the flow of fuel at high speeds.
  • Run the carburetor at idle speed. Correctly tuned, it works evenly when the engine is hot and cold, at low and high speeds. If something goes wrong, you need to turn the lower screw (T).
  • Low RPM fuel flow adjustment is adjusted by turning the right screw (L) a quarter turn counterclockwise.
  • To tune the carburetor at high rpm, open the throttle and hit maximum throttle. Turn the left screw (H) clockwise until the speed decreases. After that, turn the screw counterclockwise until the engine runs unevenly. Then slowly turn the screw back clockwise until you hear a smooth and even motor running.
  • The spark plug also serves as an indicator of proper carburetor adjustment. In case of malfunctions, carbon deposits appear on the candle, and if correctly set, its working part will remain clean.

The advantages of a gasoline trimmer

A gasoline-powered lawnmower has several advantages:

  • high power and performance;
  • the possibility of refueling at any time of operation;
  • the possibility of using a nozzle. a rotor for cutting small trees or shrubs;
  • mobility (the ability to use anywhere. on the site or in the field).

Gasoline mowers are available in 0.5 liter, 1 liter and 1.5 liter tank volumes.

How to find out the proportion of the mixture

There are a number of indirect indicators that can be used to determine the discrepancy between gasoline and oil when preparing a mixture:

  • contamination in the float chamber and carburetor channels;
  • significant deposits of tar on the elements of the fuel system;
  • oxidation of the carburetor walls and a decrease in the elasticity of rubber parts.

Any of these signs indicate the need to adjust the mixing process. By observing the proportions recommended by the manufacturer, it is possible to provide a two-stroke engine with a long stroke, as well as unpredictable and sometimes expensive repairs.

Benzocosa. a fairly common method of weed control in suburban areas, in the backyards, on the road, in housing and communal services. These devices have two other names. trimmer and lawn mower. These units differ in their engines. Of these, the more expensive ones. four-stroke, the rest. two-stroke. Of course, the latter are the most popular among the population, because they are both simpler in design and weight, lighter and much cheaper than its four-stroke competitors. However, two-stroke models are inconvenient, as the fuel mixture for them must be prepared by hand, maintaining a strict dose between gasoline and oil. In four-stroke analogs, the mixing of these components occurs automatically; all you have to do is fill the gas tank and oil tank with the appropriate substances. Let’s consider the correctness of refueling only two-stroke lawn mowers, as it depends on how efficient and long-term the operation of such a unit is.

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Gasoline to lawn mower oil ratio

  • Standard proportions
  • Mixing rules
  • Consequences of violation of the ratio
  • How to choose for lawn mowers?

lawn mowers are a fairly common technique for combating weeds in summer cottages, in household, road and housing and communal services. These devices have two more names. trimmer and lawn mower. These units differ in their engines. The more expensive ones have four-stroke engines, all the others have two-stroke engines. Of course, the latter are the most popular among the population, since they are simpler in design, and lighter in weight, and much cheaper than their four-stroke competitors. However, two-stroke models are inconvenient in that the fuel mixture for them must be prepared by hand, maintaining a strict dosage between gasoline and oil. In four-stroke analogs, the mixing of these components occurs automatically, you only need to fill the gas tank and oil tank with the corresponding substances. Let’s consider the question of the correct refueling of two-stroke lawn mowers, since it depends on how effective and long the operation of such a unit will be.

Mixing rules

And now about how to mix the components correctly. However, it would be more logical to start with an analysis of common, but absolutely unacceptable mistakes that many owners of this mowing unit “sin” with. The following actions are considered as mixing errors.

  • Adding oil to the fuel already poured into the mowers’ gas tank. In this way, a homogeneous fuel mixture cannot be obtained. Perhaps it will work, if only then shake the trimmer for a long time. But it is unlikely that someone will do this, given the severity of the unit.
  • First pour oil into a mixing container, and then add gasoline to it. Gasoline has a lower density than oil, so if it is poured into oil, it will remain in the upper layer, that is, natural mixing will not occur. Of course, it will be possible to mix later, but much more energy will be required than if it were done the other way around. pour oil into the poured gasoline.
  • Ignoring accurate measuring instruments for taking the required quantities of ingredients used. In other words, diluting the amount of oil or gasoline “by eye” is a bad habit when operating motor vehicles.
  • Take empty drinking water bottles for preparation of the fuel mixture. Such a container is made of too thin polyethylene, which can dissolve with gasoline.

Considering all of the above, we recommend using the following rules when mixing a fuel mixture for two-stroke trimmer engines.

  • Use only clean containers made of metal or special plastic for storage of gasoline, oil, ready-made fuel mixture and its preparation.
  • Use a watering can to pour gasoline into a dilution container to avoid spilling, and to add oil. a measuring container with volume risks or a medical syringe for 5 and 10 ml.
  • First, pour gasoline into the canister for preparing the fuel mixture, and then oil.
  • To dilute the mixture, first pour only half of the planned volume of gasoline into the container.
  • Next, add to the gasoline the entire amount of oil required to prepare the mixture.
  • Mix the contents of the dilution container thoroughly. It is best to stir by making circular movements with a tightly closed container. You should not stir the fuel inside the canister with any foreign object, since it is not known what material this object is made of, what reaction it can enter into with the ingredients of the mixture, how clean it is.
  • Add the rest of the gasoline to the mixed mixture and mix thoroughly again.
  • You can fill the fuel tank of the lawn mowers with the prepared mixture.

It must be borne in mind that the ready-made fuel mixture should not be stored for more than 14 days, as it loses its properties, stratifies and evaporates, which leads to changes in proportions, and therefore a deterioration in trimmer performance.

Consequences of violation of the ratio

The service life of the motor scooter depends on how accurately you follow the manufacturer’s recommended oil-gasoline ratio. The fact is that the fuel mixture enters the cylinders in the form of gasoline-oil mist. And the task of the oil composition is to lubricate the moving and rubbing parts and surfaces of various parts in the cylinder. If it suddenly turns out that there is not enough oil, and somewhere it will not be enough at all, the parts that touch dry will begin to damage each other. As a result, scuffs, scratches and chips are formed, which will certainly lead to complete or partial engine failure (for example, it can jam).

In the opposite case, when too much oil enters the engine, it does not have time to completely burn out, settling on the cylinder walls and turning over time into solid particles. coke, slag and the like. As you might guess, this also leads to engine failure. The most important thing is that you must not allow even a single violation of the proportion in the direction of a lack of oil. It is better to pour a little oil 10 times than not to top up just 1 time. It often happens that this time is quite enough to break the engine.

Standard proportions

First of all, it is necessary to take into account the information that the manufacturer recommends, since in the event of a failure of the lawn mowers, you can present your claims to him, and not to a third-party source. If there is no instruction in the passport, and even more so if there is no passport, then we recommend that you look for another trimmer model from a more reliable seller.

For all other cases, when you have a lawn mower model in your hands and there is no way to find out its technical features, there are standard proportions of the most likely fuel mixture components for a two-stroke engine. Basically, these units use AI-92 gasoline and a special synthetic oil, which contains a solvent for better mixing with fuel. Such oil evaporates slowly and has the ability to completely burn out in the cylinder, leaving no carbon deposits.

The standard ratio of synthetic oil to gasoline is 1: 50. This means that 5 liters of gasoline requires 100 ml of oil, and in accordance with this oil consumption per 1 liter of gasoline is 20 ml. Knowing the amount of oil required to dilute 1 liter of fuel, you can easily calculate any rates when preparing fuel for the trimmer. When using mineral oils, a ratio of 1: 40 is most often the standard ratio. Therefore, 1 liter of fuel will require 25 ml of such oil, and for a 5-liter canister. 125 ml.

When lawn mowers are working, a person with little experience in operating such equipment will not be difficult to determine and correct the actual amount of oil required for a particular model. You should only pay attention to the exhaust gases (their color, odor toxicity), cycle stability, engine heating and developed power. details about the consequences of incorrect mixing proportions of gasoline and oil can be expected in another section of the article. There are options for lawn mowers running on AI-95 gasoline. This should also be considered.

If the manufacturer recommends fuel with such an octane number, then the requirements must be followed so as not to reduce the operating resource of the equipment thereby.

How to choose for lawn mowers?

For two-stroke engines, lawn mowers use AI-92 or AI-95 gasoline. Most often. the first of the named. There is always information about this in the technical data sheet of the product. If, for some reason, it is not known exactly on what gasoline the trimmer should work, you can pick it up by testing both brands of gasoline in action. Global changes in the engine will not happen from this, and it is quite possible to determine what kind of gasoline this or that model of the unit “likes” more, according to some factors. This will be shown by the developed power, and throttle response, and engine heating, as well as its stable operation at all speeds.

But it is much more difficult to determine the proportions of oil to a certain volume of gasoline. In this case, you need to know at least something about the manufacturer of the equipment. And already according to the standard proportions for this manufacturer, select the proportion for a specific model, taking into account the type of oil.

You can start selection even by country of origin.

For example, for Chinese low-power trimmers, two ratios are mainly used. 1: 25 or 1: 32. The first is for mineral oils, and the second is for synthetic oils. We have already talked about the choice of standard proportions for lawn mowers of European and American manufacturers in connection with the type of oil. According to the class of oils for household trimmers, it is necessary to use TB oil according to the API classification. For more powerful. vehicle class.

For information on the ratio of gasoline and oil needed for lawn mowers, see the next video.