The Proportion Of Gasoline And Lawn Mower Oil

Choosing the right fuel

Most lawn mowers run on gasoline. There are diesel ones, but we will NOT tell them in them within the framework of the article. The petrol stations sell petroleum products of the following brands:

The N-80 brand has been discontinued and is rare. The octane number (the number after the letters) indicates the resistance of the fuel to knock. The higher the value, the greater the resistance to self-ignition during compression. Gasoline AI-92 is more prone to detonation than AI-95. In the production of motors for lawn mowers, the manufacturer takes into account the resources of the parts and the maximum allowable knock. The instructions for the tool indicate which gasoline to use.

Compliance with the recommendations increases the service life of the mower. If you fill in gasoline with a lower octane number than indicated in the passport, the piston group will quickly fail. Using a higher fuel value is also detrimental to the engine. There is a possibility of higher octane number due to the improvement of the oil distillation process. Therefore, refineries add chemical additives to the fuel. The resistance to detonation increases, along with it the duration of combustion increases. The result is carbon deposits on candles, rings, cylinders.

What gasoline to fill?

Almost all lawn mowers consume unleaded AI-92 gasoline, which is called Regular at some gas stations. However, some models are designed for gasoline AI-95 (Premium) or even AI-98 (Super).

If you fill in the type of fuel recommended by the manufacturer, the engine will use its resource very carefully and it will last for many years or even decades. There are cases when lawn mowers, released in the mid-eighties of the last century, still work without repair or replacement of the engine.

What gasoline to fill in a lawnmower with a four-stroke engine?

And now we will tell you what kind of gasoline to pour into a lawn mower with a four-stroke engine, the main difference of which is the presence of a crankcase. It contains oil for lubricating the engine, therefore, in order for an apparatus of this type to work normally, it is enough to fill it with only gasoline. But there are also some peculiarities here. Because the equipment does not have an oil filter, which means that it is NOT cleaned, it needs to be changed approximately every 50 hours of operation.

What gasoline to pour into the lawn mower and how to choose oil?

The engine of any gasoline lawn mower is very demanding on fuel and oil, therefore the use of the wrong fuel or the wrong motor oil leads to a decrease in its resource, as well as its failure.

After all, a lawn mower engine works on the same principles as a car engine. Therefore, in order for it to work without breakdowns and with maximum power, it is necessary to use Not only high-quality, but also the corresponding gasoline and oil.

For example, only four-stroke engines are installed on lawn mowers, while lawn mowers, as well as other hand tools, only two-stroke, and it is better to refuel with fuel suitable for this type of engine.

Next, let’s try to understand the question of which gasoline to pour into the lawn mower, in more detail.

How to refuel a gasoline lawn mower?

For refueling use pure unleaded gasoline, which was stored for NOT more than a week in a clean container without oil residues.

It is necessary to fill in fuel using a watering can or a special tip put on the canister to avoid spilling gasoline.

After all, spilled fuel poses a serious fire hazard, and also emits an unpleasant odor and stains hands or clothes.

Do not fill a full tank of fuel, because during operation the engine generates a lot of heat, part of which reaches the mower’s gas tank and, at least a little, heats its contents. This leads to increased fuel evaporation and an increase in pressure inside the gas tank, which also leads to an increase in pressure inside the fuel system.

If this happens, the air-fuel mixture entering the cylinder will be richer, which means that the fuel contained in it will NOT burn completely, but will be up in the engine head and its muffler, which will reduce the resource of THESE parts.

In order to fill fuel, you need to do the following:

  • Stop the engine, if the machine was mowing the grass before, then wait 5-10 minutes for the engine and the surrounding space to cool down (if the mower was just delivered to the work site, then this item is NOT required)
  • With a clean rag, clean the fuel tank cap, as well as the surrounding area from cut grass or dust;
  • Unscrew the lid and put it aside;
  • Using a watering can or a special nozzle on the canister, pour fuel into the tank;
  • Put on, then wrap the lid;
  • Wipe the lid, filler neck and tank with a clean, dry cloth.

What gasoline for a lawn mower. Which gasoline is best for a small engine or lawn mower?

The fuel for your lawn mower or outdoor power equipment must meet the following requirements:

  • Clean, fresh, unleaded
  • The minimum octane rating is 87/87 AKI (91 RON = Research Octane). When working at high altitude, see the instructions below.
  • Gasoline is allowed with m up to 10% ethanol (Benzalcohol) or up to 15% MTBE (methyl tertiary butyl ether). At present, some filling stations sell gasoline with up to 15% ethanol. This E15 product is not recommended for use in small engines.
  • You can also use bottled fuels such as Briggs Stratton Advanced Formula Ethanol-Free Fuel. This fuel combines unleaded gasoline with fuel stabilizer to extend fuel life.
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Note. VIEW BEFORE DOWNLOADING! DO NOT use an unapproved type of fuel (such as E85 ethyl gasoline) and DO NOT modify your Briggs Stratton engine to run on alternative fuels. Doing so could cause damage to small engines and void your Briggs Stratton warranty.

But not all fuels are created equal. If you are having problems starting or operating your lawn mower or equipment, try using a second source or other brand of fuel.

High Altitude Fuel Recommendations

When operating above 5000 feet (1524 meters) above sea level, gasoline with an octane rating of at least 85/85 AKI (89 RON) is permitted. To ensure compliance with emission requirements, adjustments must be made to high altitude equipment. Operation without this adjustment will result in degraded performance, increased fuel consumption and increased emissions.

Operating an engine adjusted for high altitude below 2500 feet (762 meters) is not recommended.

Mixing Oil Fuel in Small Engines

  • 4-stroke spark ignition engines: Do not mix oil with gasoline or modify the engine to run on alternative fuels. This will damage engine parts and void the engine warranty.
  • 2-stroke spark ignition engines Always Mix a high quality 2-stroke oil, such as Briggs Stratton lawn mower oil, in a petrol / oil ratio of 50: 1.

Don’t know what type of engine you have? See Your Briggs Stratton Engine Manual or Contact Your Local Service Dealer.

Gasoline for a lawn mower: which one to choose and NOT prog?

New to buy an internal combustion lawnmower? Don’t know which fuel to pick? In this article, we will consider the brands of gasoline sold on the Russian market. You will learn which choice to make, whether it is possible to save on octane number, how to extend the tool life.

What type of fuel is best for lawn mowers and small engines?

Looking for the best gasoline or fuel for your external power equipment? Briggs Stratton experts share tips for choosing the right fuel type and storing your small engine to keep it running at its best.

CAUTION! Fuel and fuel vapors are highly flammable and explosive. Always handle fuel with extreme care. Find all engine hazard warnings

Consequences of violation of the ratio

How accurately you will observe the proportions of the oil-gasoline mixture recommended by the manufacturer depends on the service life of the motor scooter engine. 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, but somewhere it will not be enough at all, the parts touching 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 towards the lack of oil. It is better to pour a little oil 10 times than not to add just 1 time. It often happens that this time is quite enough to break the engine.

Filling the two-stroke lawn mower

Typical household lawn mowers typically use a two-stroke engine. Lawn mowers do not need a lot of power and agility, so it is quite suitable for the tasks assigned. In addition, this engine is much cheaper and simpler, but it is fueled with a mixture of oil and gasoline. Such fuel is poured into the carburetor and fed into the cylinder in the form of oil-gasoline mist. Thus, the oil provides lubrication of all the necessary parts, and during the operation of the engine it burns along with gasoline. However, the combustion of this mixture is accompanied by the release of a pungent odor and smoke, which increases the toxicity of exhaust gases.

Important! For such lawn mowers, you need to use a special oil for two-stroke engines, which burns completely, do not leave a burn, and has low evaporation. And so that it mixes well with gasoline, it contains 20% solvent.

The choice of oil and gasoline for preparing a fuel mixture for a trimmer: dilution ratio table

A trimmer, or lawn mower, is an indispensable tool in the household. over, its reliability, efficiency and long service life depend on many factors. For example, the quality of fuel. This means that you need to select the correct oil for the trimmer, observe the proportions when adding to gasoline and the rules for refueling the device.

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, we recommend that you look for another trimmer model in 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 probable fuel mixture components for a two-stroke engine. Basically, for THESE units, AI-92 gasoline and a special synthetic oil are used, which contains a solvent for better mixing with fuel. This oil evaporates slowly and has the ability to completely burn out in the cylinder, Do not leave carbon deposits.

The standard ratio of synthetic oil to gasoline is 1: 50. This means that 5 liters of gasoline need 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. Therefore, 1 liter of fuel will require 25 ml of such oil, and for a 5-liter canister. 125 ml.

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When working with lawn mowers, a person with little experience in operating such equipment will not be difficult to determine and adjust the actual amount of oil required for a particular model. You should only pay attention to 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 variants of lawn mowers running on AI-95 gasoline. This should also be considered.

If the manufacturer recommends fuel with such an octane number, then you need to follow the requirements so as not to reduce the operating resource of the equipment.

Choosing a brand of gasoline for trimmers

Select the brand of gasoline for lawn mowers, taking into account the manufacturer’s recommendations. If you do not follow them, then the motor will soon break down. Often RON 92 or RON 95 unleaded fuel is used to fill the trimmer tank.

Gasoline for fuel mixture

Filling the trimmer with AI-80 gasoline can lead to device breakdowns due to its low technical characteristics. Please note that after purchase, fuel can be stored NOT for more than 60 days, but it is better to reduce this period.

Polyethylene cans are not used for storage, because if they come into contact with the inner walls, static electricity will be generated. An accidental spark will cause an explosion. Although, there are special plastic canisters marked “flame”.

Features of refueling a lawn mower

Lawn mowers are divided into two-stroke and four-stroke depending on the engine design. In the first case, the piston in an internal combustion engine makes 2 strokes in one working cycle, and in the second case. 4 strokes. Differences in the principle of operation of the engine cause different approaches to refueling the trimmer.

Refueling the four-stroke lawn mower

Four-stroke engines are used in professional lawn mowers. They have great power and can work for a long time without interruption and refueling. They also use gasoline and oil as fuel, but they are poured into different tanks. This means that the oil does not participate in the combustion process, therefore the exhaust gases are not so toxic.

On a note! Along with better environmental performance and the ability to heat less, four-stroke lawn mower engines are also more economical. They consume much less fuel. savings up to 50% for gasoline and up to 80% for oil.

Gasoline to lawn mower oil ratio

Lawn mows are a fairly common technique for combating weeds in summer cottages, in road gardens 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, 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 manually, 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 issue 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.

Gasoline and oil for two-stroke internal combustion engines

Modern engines operate at high compression ratios. Compression ratio means the ratio of the total volume in the cylinder to the compression volume when the piston is in the VMP. The designers set this value 10. 11. In reality, due to gas leaks during the compression process, it turns out slightly less (8. 9).

For such high values ​​of the compression ratio, gasolines with a high octane number, which is more than 90, are needed. In the recommendations of the ICE manufacturers, you can find recommendations for the use of A92 or A95 gasoline. Therefore, you should adhere to the requirements. If fuel with a low octane rating is used, detonation will occur, which will lead to the rapid destruction of the engine.

Traditionally mineral oils are recommended for small motors. They are obtained as a result of the cracking process carried out in the refining of oil. Achieve obtaining a viscous liquid with a high viscosity index, more than 20 centistokes. To give additional positive characteristics, additives are produced. additives. They are necessary for:

  • Prevention of foam formation. In this case, the oil film will evenly cover the parts upon contact during operation;
  • Washing parts. Detergent additives help to constantly change the oil in the contact zone. Then there will be no burn-in;
  • Non-stick additives help to remove waste oil at high temperatures of metal parts.

In recent years, foreign manufacturers (Germany and France) have proposed using semi-synthetic oils for two-stroke internal combustion engines. They are obtained as a result of complex processing of natural gas. These lubricating fluids have a constant viscosity over a wide temperature range, which has a positive effect during operation. The viscosity remains even when the metal is heated to 100. 150 ⁰С. In mineral oils, the indicator decreased tenfold.

Semi-synthetic oils are more stable when heated. When using them, motors show a higher service life. On average, there is an increase in the resource by 30. 40%.

In studies carried out in the Netherlands (2001. 2004), it was found that the use of a semi-synthetic lubricant allows some reduction in the concentration of oil during the preparation of the vehicle. But these data are advisory in nature. ICE manufacturers have not yet commented on this issue.

Mixing ratio of gasoline and oil

In the operating instructions for two-stroke engines, you can read in what proportion the components of the fuel mixture (TC) should be mixed.

  • For motorcycles with power over 10 HP, it is recommended to prepare a vehicle in which the oil will be 1: 20 part. At the same time, it is noted that during the engine break-in period, the proportion should be more saturated, and be 1: 15.
  • For small tiller engines, the proportions are different. It is recommended to run in by creating a mixture in a ratio of 1: 20. In the future, the internal combustion engine is operated, maintaining the TS at 1: 30 (35).
  • Chainsaws are operated at the second ratio of oil and gasoline. 1: 40 (running in) 1: 50 (subsequent operation).
  • Small trimmers and gasoline scythes require much less engine oil. A constant ratio of 1: 50 is recommended here.
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Proportion of oil and gasoline for a two-stroke gasoline engine

Many summer residents and villagers have tools with gasoline engines. To obtain a high specific power (the number of hp per 1 kg of device mass), two-stroke internal combustion engines are used from the power plant. All clock cycles are performed in one working stroke.

A special lubrication system, which is necessarily present in four-stroke engines, is not provided for in simplified designs. Therefore, the fuel mixture (TC) consists not only of combustible parts, but also a lubricating component.

Users sometimes have questions about how to properly prepare the vehicle for existing devices. For INDIVIDUAL ICEs, manufacturers indicate different ratios between gasoline and oil. In recent years, oil producers have begun producing not only mineral oils, but also semi-synthetic and synthetic oils for two-stroke engines can be found in the trade network. The question arises: “Which motor oils should I give preference to?”

The amount of gasoline and oil in mixtures

For ease of use for users of two-stroke internal combustion engines, all recommendations for creating proportions are summarized in the table.

The Proportion Of Gasoline And Lawn Mower Oil

Operation of a two-stroke gasoline internal combustion engine

Work in two-stroke internal combustion engines occurs in the following sequence:

First measure. When it is committed, the piston moves from the bottom dead center (BDC) to the top dead position (VMP).

  • Vacuum is generated in the area of ​​the crank mechanism.
  • From the carburetor, the gasoline-air enters the space when the intake window is opened (it is usually overlapped by the piston).
  • A part remains inside and creates a lubricating film on the surface of rubbing parts.
  • After the moment the purge hole closes, compression of the combustible mixture begins.
  • Do not reach the VMP, there is a supply of electricity to the spark plug. The compressed mixture ignites.

Second measure. Here, the working stroke, the release of the exhaust combustion products and the blowing of the cylinders take place.

  • When the petrol-air mixture ignites, it burns. Combustion is accompanied by an increase in pressure. It increases to 25. 30 bar.
  • The piston is under increased pressure and moves down towards BDC. A working move is in progress.
  • The force of the gas pressure is transmitted by the crank mechanism. The engine crankshaft rotates. The torque is transmitted to the working elements of the tool or gearbox.
  • Moving on, the piston opens the purge window. Combustion products leave the cylinder and are directed to the exhaust system (muffler).
  • Purge is carried out until the purge and inlet ports are completely closed.

For one revolution of the crankshaft in engines of this type, a full cycle of operation is performed. Specific power in such processes is 50. 75% higher than can be obtained in a four-stroke process.

In practice, there are not only single-cylinder engines for motor vehicles create two-cylinder internal combustion engines. For cars, motors are created in which a larger number of cylinders are used.

The efficiency of such internal combustion engines is lower than in power plants operating in a four-stroke design. The explanation is simple, the purging and filling of the cylinders with a fuel mixture in more complex structures is much higher.

Important should be noted. Lubrication is carried out by passing the mixture through the crank chamber. If there is little oil in the composition, then friction contact without an oil film is possible. This will cause scuffing and engine damage.

If the oil turns out to be more than the required rate, then it will burn during combustion. The combustion process will be extended over time. Afterburning will occur on the exhaust, which will lead to overheating of the internal combustion engine. The exhaust will be noisy and smoky.

Table: Amount of gasoline and engine oil for the preparation of the fuel mixture

proportion Ready mix amount
Ready mix, l Gasoline, l Oil, ml
1:15 1.0 0.933 66.7
1:15 2.0 1,867 133.3
1:15 3.0 2,800 200.0
1:15 4.0 3.733 266.7
1:15 5.0 4.667 333.3
1:15 6.0 5,600 400.0
1:15 7.0 6.533 466.7
1:15 8.0 7.467 533.3
1:15 9.0 8,400 600.0
1:15 10.0 9,333 666.7
1:15 11.0 10.267 733.3
1:15 12.0 11,200 800.0
1:15 13.0 12,133 866.7
1:15 14.0 13,067 933.3
1:15 15.0 14,000 1000.0
1:15 16.0 14.933 1066.7
1:15 17.0 15,867 1133.3
1:15 18.0 16,800 1200.0
1:15 19.0 17,733 1266.7
1:15 20.0 18,667 1333.3
1:20 1.0 0.950 50.0
1:20 2.0 1,900 100.0
1:20 3.0 2,850 150.0
1:20 4.0 3,800 200.0
1:20 5.0 4,750 250.0
1:20 6.0 5,700 300.0
1:20 7.0 6,650 350.0
1:20 8.0 7,600 400.0
1:20 9.0 8,550 450.0
1:20 10.0 9,500 500.0
1:20 11.0 10,450 550.0
1:20 12.0 11,400 600.0
1:20 13.0 12,350 650.0
1:20 14.0 13,300 700.0
1:20 15.0 14,250 750.0
1:20 16.0 15,200 800.0
1:20 17.0 16,150 850.0
1:20 18.0 17,100 900.0
1:20 19.0 18,050 950.0
1:20 20.0 19,000 1000.0
1:25 0.5 0.480 20.0
1:25 0.6 0.576 24.0
1:25 0.8 0.768 32.0
1:25 1.0 0.960 40.0
1:25 1.5 1,440 60.0
1:25 2.0 1.920 80.0
1:25 2.5 2,400 100.0
1:25 3.0 2,880 120.0
1:25 3.5 3,360 140.0
1:40 0.5 0.488 12.5
1:40 0.6 0.585 15.0
1:40 0.8 0.780 20.0
1:40 1.0 0.975 25.0
1:40 1.5 1,463 37.5
1:40 2.0 1,950 50.0
1:40 2.5 2,438 62.5
1:40 3.0 2.925 75.0
1:40 3.5 3.413 87.5
1:50 0.5 0.490 10.0
1:50 0.6 0.588 12.0
1:50 0.8 0.784 16.0
1:50 1.0 0.980 20.0
1:50 1.5 1,470 30.0
1:50 2.0 1,960 40.0
1:50 2.5 2,450 50.0
1:50 3.0 2.940 60.0
1:50 3.5 3.430 70.0

How to prepare the fuel mixture

To prepare the mixture, prepare a transparent container in which marks are required:

  • Amount of gasoline, l
  • The amount of engine oil, ml. This label is placed above.
  • Gasoline is poured to the required level. Using a medical bulb can remove excess.
  • Add oil to the upper mark.
  • The lid is closed and the mixture is stirred.
  • The finished mixture is poured into the fuel tank.
  • Surplus is poured into an additional bank