Correct oil ratio for brushcutters and chain saws
Many users of gasoline-driven tools treat the preparation of the fuel mix rather irresponsibly. I’ve seen chain saw owners who dilute gasoline with oil “by eye”, for example. They just pour in as much as they want and then they come to me with faulty tools.
It is important to understand that more, just like less, is not better. It’s the golden mean that counts.
If you make an oil-deficient mixture, it’s all too clear. There will not be enough lubricant for the cylinder and bearings, which means increased friction and temperature, scoring in the cylinder and may seize the crankshaft bearings.
And what happens if you overfill?? High oil volume, on combustion, produces many residual combustion products that can deposit on the piston, cylinder bore and muffler, impeding the flow of exhaust gases. As a result, power loss or complete loss of performance.
The soot that is formed by too much oil can deposit under the compression rings, not allowing them to compensate for the thermal expansion, leading to scuffing, in general, the consequences can be quite serious.
STIHL chain saw oil
To begin with, it would be a good idea to mention that all STIHL chain saws are created with a fairly small size, but for their size, they have a very impressive power. This special feature makes STIHL chain saws very popular everywhere.
High quality notwithstanding, durability depends on having the right lubricant and fuel. The first problematic question faced by the owners of this equipment is: What oil and fuel to choose for your chain saw?? In this article you’ll learn what oil is better to use for your chain saw, and about what fuel to fill their “little”.
Choosing an oil for your STIHL chain saw
The first thing you should know is that almost all STIHL chain saws are equipped with a two-stroke carbureted engine. Also two separate fuel tanks: one for the oil and one for the gasoline.
First, and most importantly, remember that domestic-made chainsaw models are filled with simple oil, which is usually poured into motorcycle tanks, and their proportion should be no more than 1 to 25. As for chainsaws made abroad, it is necessary to buy brand-name oils, for which the ratio is 1 to 40. Of course, you can try to put domestic saw oil in an imported saw, in which case, the power of your tool may drop noticeably. The best advice you can get when buying this kind of oil is to read the owner’s manual for your machine.
If you own a STIHL-brand chain saw or are considering buying one of these models, here’s an overview of the STIHL MC 180 brand chain saw.
A good choice is a synthetic oil for air-cooled two-stroke engines, API-TB and API-TC. When you go to the store, ask the salesman about such brands as STIHL, Husqvarna, HAHOTEK, Champion, ALCO, etc. Never be stingy with ingredients, it is better to spend on a quality product rather than spend a lot of money for repairs.
Choosing gasoline for your STIHL chain saw
when choosing gasoline for your chainsaw you should pay attention to the quality of gasoline itself and its octane number. Gasoline in the AI92 octane range is best. You might try AI95, but there are lots of questions about its quality. And if you have doubts about the quality of AI95, then AI92 is the best choice for you.
We advise you not to use gasoline which has been in a container for a long time, be it a can, a tank or anything else. Only fresh gasoline should be used for the fuel mixture, otherwise it may lose all its useful qualities: octane number, etc. But if you still use gasoline which is not first quality, your STIHL chain saw is underpowered. If the chainsaw breaks down because of using such fuel, you will have to spend a lot of money to repair it, because such a case is not covered by the warranty, and you will be better off buying a new tool.
STIHL MC 180 chainsaw. technical specifications
The STIHL MS 180 chain saw stands out with convincing technical values. They include:
- power. 2 l. с.;
- Fuel tank capacity of 270 ml;
- The fuel tank capacity is 260 ml;
- possible length of the bar used for work. 30-35 cm;
- 3/8″ chain pitch
- assembled weight. 4 kg.
Among the advantages of the model should be noted modest fuel consumption. The motor consumes no more than 2.9 l/mach when working at maximum loads. hour.
STIHL STIHL 180 chain saw comes with
With the purchase of this model, the farmer receives a complete list of equipment required for assembly, as well as the use of tools.
The basic delivery set of the chainsaw includes:
- bar, length 35 cm;
- A chain with a pitch of 3.8 ” and a groove width of 1.3 mm;
- bar cover for the bar;
- instruction manual in russian.
Together with the tool the buyer also gets a brand-name wrench and screwdriver that can be used to quickly disassemble the saw for its repair.
Mixing ratio for STIHL
STIHL is a German family-owned company with production sites in many countries all over the world. Located in Weiblingen. Among the manufactured range of products for the needs of forestry, the place of honour belongs to small-scale mechanization.
Today is the liquid gold age for STIHL chain saws:
The manufacturer has set the standard for oil dilution at a ratio of 1:50. The suggested proportion makes it possible to dilute 1 part of the oil in 50 parts of gasoline. Or 1:40 ratio.
Easy to calculate. We know that 1 liter of combustible liquid is equal to 1000 milliliters. We divide the value by 50, and obtain 20 milliliters of oil. According to a similar algorithm, its volume is determined, recommended at a ratio of 1:40. Having made simple calculations, we obtain the value of 25 milliliters.
Proportions for Swedish Husqvarna chainsaws
What is the exact amount of lubricant product required to prepare the combustible mixture required for the normal operation of a two-stroke petrol internal combustion engine? Customers learn about this from the enclosed instructions to the product. But the documentation is often lost in the paperwork. In this regard, it is not superfluous to be reminded. the manufacturers use gear lubricant for mixing with gasoline. Swedish company is known in all continents of the planet for its reliable products. Husqvarna chain saw oil is used strictly according to the manufacturer’s recommendations.
Depending on how much power is required from the units, the appropriate component dilution is chosen:
In one liter of fuel dilute from 40 to 50 parts of oil. These are the ideal proportions of gasoline and oil.
By the way we inform you that only unleaded gasoline brands AI-92 or AI-95 are used. Ethylated fuel product is considered an unfortunate choice for internal combustion engines because it shortens the engine’s operating life.
Husqvarna HP
The brand structure of the Swedish manufacturer Husqvarna HP includes a company that produces mechanized hand tools and lubricants for them, effective chemical additives.
The manufacturer developed an original ratio of fuel to oil for the Partner chainsaw for two-stroke power units:
The ratio of mixing fuel consistency is derived from the standard formula of 1:50. This is a constant. That is 20 milliliters per liter of AI-92.
There are moments of non-compliance with the standard approach of diluting with a lubricant of the company’s own production. This is when the internal combustion engine is in the running-in phase. A 1:40 mixture is allowed for the engine.
Proportions for Swedish Husqvarna chainsaws
What is the exact ratio of lubricant required to prepare the fuel mixture required for normal operation of a two-stroke gasoline internal combustion engine? You find that in the manuals that come with the products. But documentation often gets lost in the papers. In this regard, it is not unreasonable to be reminded. manufacturers use gear lubricant to mix with gasoline. The Swedish company is known on all continents of the planet for its reliable products. Husqvarna chainsaw oil is used strictly as recommended by the manufacturer.
Depending on how much power is required from the units, the appropriate component dilution is chosen:
One liter of fuel dilutes 40 to 50 parts of oil. It’s the perfect proportions of gasoline and oil.
By the way. only unleaded AI-92 or AI-95 gasoline is used. leaded fuel product is considered an unsuccessful choice for an internal combustion engine because it shortens the service life of the engine.
Husqvarna HP company structure
The brand structure of the Swedish manufacturer Husqvarna HP includes a company that produces mechanized hand tools and lubricants for them, as well as effective chemical additives.
For the Partner chainsaw, the manufacturer developed an original fuel/oil ratio for two-stroke power units:
The mixing ratio of fuel consistency is derived from the standard formula of 1:50. It’s a constant. That is 20 milliliters per 1 liter of AI-92.
There are moments of non-compliance with the standard approach to dilution with the company’s own lubricant product. This is when the internal combustion engine goes through its running-in phase. Allowed for the engine combustible mixture in the value of 1:40.
Which chainsaw parts need oil
If you look closely at a chainsaw in operation, its main moving part. the saw chain, which slides on the guide bar during sawing. is immediately conspicuous. Because the law of friction still exists, both parts gradually wear out. To slow this process down it is customary to use chain oil specially formulated for the lubrication of saw chains.
Chainsaws can be fitted with both four-stroke and two-stroke engines. In 4-stroke machines the crank group is lubricated by oil in the engine crankcase. The two-stroke engines are a little different in their design and operating principle. Gasoline of this drive type goes directly to the space under the piston where the crank mechanism is located, which has several bearings and bushings that need to be lubricated. That is why chainsaw two-stroke oil is added to petrol to enable it to lubricate the rubbing parts of the block.
How much oil for 1 liter of gasoline?
Oil and gasoline dilution tables
| 1 liter of AI-92 petrol | 40 grams of oil | 20 grams of oil |
| 2 liters of AI-92 gasoline | 80 grams of oil | 40 grams of oil |
| 3 liter AI-92 gasoline | 120 grams of oil | 60 grams of oil |
| 4 liters of AI-92 gasoline | 160 grams of oil | 80 grams of oil |
First, let’s define what the notation of the proportion of 1 to 25 means. It means there is one number that is twenty-five times the other. For example, the number 250 is twenty-five times the number 10 (250/10=25).
How to mix the oil with petrol for two-stroke engines?
Ratios are given as follows: 1:50, 1:40, 1:25, etc. Any of these proportions tells you how much oil to pour per volume of fuel. For example, you need 1 liter of oil for 25 liters of gasoline to make a 1:25 mixture.
How much oil to use for your STIHL?
BioPlus is the optimal choice for chain oil and is especially worth selecting if you cut chain saws occasionally. Optimal price and quality make BioPlus the most popular chain oil in the STIHL range.
If you use a “native” oil for your chainsaw, the correct proportion is indicated on the package, usually it is 1:50 to gasoline. When another product is used, then it is better to dilute the mixture 1:40, in other words, you need to divide 1 liter of oil by 40 and add the result to 1 liter of gasoline.
How much oil to fill 3 liters of gasoline?
Tables for oil and gasoline dilution
| 2 liters of AI-92 gasoline | 80 grams of oil | 40 grams of oil |
| 3 liters of AI-92 gasoline | 120 grams of oil | 60 grams of oil |
| 4 liters of AI-92 gasoline | 160 grams of oil | 80 grams of oil |
| 5 liters of AI-92 gasoline | 200 grams of oil | 100 grams of oil |
As a rule, the ratio is 1:25 and 1:50. For example, to calculate the amount of oil in a 1:25 ratio, divide the amount of gasoline by 25. Example: 1 L of gasoline / 25 = 0.04 L. (40 ml) oil.
How much oil to dilute in a chainsaw?
On average, one liter of gasoline is mixed with 20-50 ml of oil. STIHL and Husqvarna, for example, recommend 100 grams of oil per 4 liters of gasoline. The ratio shown is optimal for chain saws up to 1.5 kW. For chainsaws over 1.5 kW of the same brands use a ratio of 1/50 (100 ml oil to 5 liters gasoline).
When using a STIHL chain saw, how much oil to use per liter of gasoline? The ratio will be 25 ml of additive per liter of fuel. Keep in mind that there are oils for chains and motors.
Storage times for ready-to-use fuel mixture
Motorists know that it’s not a good idea to stockpile gasoline for too long, and ready-to-use fuel mixes deteriorate even more quickly. Mix the correct proportions of oil and gasoline for your STIHL chain saw before you start work. Manufacturers allow storage of ready fuel up to one month, but experts recommend reducing this period to 10 days. Immediately after mixing the solution begins to lose its original properties and over time it becomes not at all the same quality as it was prepared. Learn to prepare as much fuel for the saw as you can use at one time. This comes with experience. Store the mix in a gasoline-proof, opaque, sealed container. Any plastic metal canister for combustible materials will do. Also use an oil can or dark glass container.
In addition to the motor, for which all the proportions of oil and gasoline for STIHL chain saws have already been figured out, there is another important part, consisting of many moving parts. the chain. For its lubrication use chain oil, not motor oil. It has completely different properties and is cheaper.
For a new tool, use only oils from the manufacturer that are recommended in the manual. Otherwise, if the saw breaks down, it is no longer covered under warranty because it is not operated properly. It should be noted that the oils from the manufacturer are of really high quality. After the end of the warranty period, you can use any engine oil and change it twice a year.
Peculiarities of the running-in of a new tool
This includes gentle chainsaw operation during the initial phase of the chain saw’s life. The technology also allows the engine to run on a mixture with 20% more engine oil.
Break-in time in motor-hours is specified in the enclosed instruction. In practice, for the tool to reach the operating level, it is sufficient to work out 3-5 refills of the gas tank of the saw.
New models do not need a running-in period, but it is not recommended to use the chainsaw for the first few hours with heavy loads.