How to dilute gasoline for a chainsaw Ural


What happened? To be honest, it was expected that the mixtures on the 92nd gasoline will show themselves from a much more “high temperature” side compared to the 80th. But, oddly enough, nothing of the kind happened. The saw sawed quite tolerably on all the indicated mixtures. It was not possible to record special temperature rises.

However, this may be due mainly to the relatively low sawing loads. Indeed, for “Ural” timber up to 30 cm in diameter, even oak. this is a warm-up. Especially if the chain is of good quality and sharpened. Its capabilities are really manifested when wood is sawn with a diameter of 70 80 cm. When the wood is damp and viscous, and the chain literally gets stuck in it (for example, old poplars, whose wood is intertwined with numerous twigs). However, some changes were still recorded.

The table below shows the results of the experiments:

Fuel mixture Cylinder head temperature (millivolt / 0 С) Exhaust gas temperature (volt / 0 С) Working hours Note
1. A mixture of 80-th gasoline (“Normal”) with oil in a ratio of 1:20; the mixture was in a plastic canister for about 6 12 months (leftovers) 2.4 / 91 0.59 / 206 Idling
3.1 / 116 0.8 / 270
2.8 / 105 1.5 / 483 Average load
2.9 / 108 1.3 / 422
3/112 1.6 / 513
3.1 / 116 1.2 / 392
3.0 5.3 / 112 254 0.87 1.30 / 291 422 High load
2. A mixture of 92 gasoline (“Regular”), which traveled about 7 thousand km in a car in a sealed metal canister for about 6 12 months, with oil in a ratio of 1:20 2.4 / 91 0.8 / 270 Idling
3.4 / 129 0.94 / 313
3.8 / 149 0.82 / 276
3.9 / 155 0.9 / 301 Average load Subjectively, the difference between 80 gasoline is imperceptible
4.5 / 191 1.13 / 370
4.1 / 166 1.25 / 407
3.0 4.5 / 112 191 0.88 1.23 / 294 401 High load
3. A mixture of 92 gasoline purchased at Bashneft filling stations on 11.07.2019, with oil in a ratio of 1:20 2.5 / 94 0.7 / 240 Idling The saw became more responsive to pressing the throttle handle, even somehow unusual. A lot of bluish smoke.
3.7 / 144 0.88 / 294
3.4 / 129 0.98 / 325 Average load
4.2 / 172 1.02 / 337
4.1 / 166 1.11 / 364
4. A mixture of 92-th gasoline (“Regular”), which was in a sealed metal canister for about 6 12 months, with oil in a ratio of 1:20 kerosene in a ratio of 1: 8 3.5 / 134 0.92 / 307 Average load Subjectively, it became somehow more pleasant to saw than without kerosene at all
4.7 / 205 1.17 / 383
4.1 / 166 1.08 / 355
4.6 / 198 1.32 / 428 High load Not enough power
5. A mixture of 92-th gasoline (“Regular”), which was in a sealed metal canister for about 6 12 months, with oil in a ratio of 1:20 kerosene in a ratio of 1: 4 3.3 3.5 / 125 134 0.50 0.86 / 179 288 Idling There is less smoke than with the addition of kerosene 1: 8; but at the same time. harsh engine performance
4.2 / 172 1.18 / 386
4.5 / 191 1.14 / 373 Average load
6. A mixture of 92 gasoline purchased at Bashneft filling stations on 11.07.2019, with oil in a ratio of 1:20 diesel fuel in a ratio of 1:10 2.8 / 105 1/331 Idling Lots of bluish smoke. However, the saw starts up VERY easily, with just 1 pull. prone to overheating of the cylinder head.
5/228 1.51 / 486 Average load
5.2 7.0 / 245 463 1.23 / 401

Note 1. This table is not sequential (chronological), but the most typical values. As can be seen, substantially different exhaust gas temperatures can correspond to practically the same values ​​of the cylinder head temperature, and vice versa.

Note 2. Temperature values ​​are given in “raw” data (according to voltmeter readings), and after a slash. in degrees Celsius. The data were converted into degrees after the appropriate calibration of the thermocouples. A thermocouple that monitors the temperature of the exhaust gases was connected to the multimeter through a DC amplifier with a gain of approximately 120.

Note 3. The Ural chainsaw is prone to uncontrolled changes in idle speed. Therefore, during the experiments, they were periodically adjusted.


First, you should outline the criteria on the basis of which we will draw conclusions, whether it is possible to use a chainsaw on 92nd gasoline. It:

The first two criteria are obvious. It is clear that if we cannot start the engine without serious tweaks, if we cannot more or less fully work with a chainsaw, then, naturally, 92nd gasoline will clearly not be suitable.

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By reliability we mean the preservation of the operating parameters of the chainsaw engine, in particular, its temperature. precisely, not too much temperature rise during engine operation, when running on 92nd gasoline, compared to 80th.

Of course, there are also other factors of reliability, for example, the composition of gasoline (will it corrode the carburetor gasket, for example), the burning rate, the maximum pressure in the combustion chamber, the tendency to detonate, etc. But, the first two three of them are interrelated with temperature. As for the latter. so for this 92nd gasoline is even better than 80th.

Influence of the quality of the fuel mixture on the temperatures of the cylinder head and exhaust gases

Also, studies were carried out to what extent both temperatures are affected by a change in the quality (enrichment / depletion) of the fuel mixture. As a rule, depletion led to an increase in idle speed; but, even after their adjustment (reduction), the temperature of the cylinder head increased quite significantly (by 50% or more). This was especially noticeable for the last mixture (with diesel fuel). When the mixture was enriched, the head temperature at idle speed decreased.

Whereas the temperature of the exhaust gases, oddly enough, was not too subject to changes depending on changes in the quality of the mixture.

Why like this.

That’s how. They took it and stopped it. NATURALLY, without asking the citizens of the country. the owners of the equipment about it. You, they say, and so it will go. Buy the gasoline that is on sale, and that’s all. And if your equipment does not work there, then it is supposedly “your” problems.

Strictly speaking, of course, these are not the problems of the owners of equipment, for which they no longer produce the fuel for which it is designed. These are not even the problems of oil companies, although in relation to them one could recall the antimonopoly legislation, at least After all, the termination of the production of 80 gasoline is very similar to a cartel conspiracy. This is the problem of the state, in particular, its legislative power (i.e., the power that approves / signs laws), as well as the guaranteeing (i.e., the one that, it seems, is obliged to guarantee something there. something then from a series of compliance with the rule of law, first of all, the Constitution of Russia, of course). But, since this, like his, “guarantor” is now engaged in rather fascinating and “interesting” affairs, often far from state administration, then then you have to solve the issue in other ways. Of course, a separate article could be devoted to the legal aspects of stopping the production of 80th gasoline.

And what is the temperature.

Here we are all talking. temperature, temperature. Which one? Temperature. WHAT? At a minimum, this is the exhaust gas temperature. However, there is also the temperature of the block head. There is also the temperature of the working mixture during its combustion. average and maximum.

Indeed, what is meant by “temperature” in this case? WHAT temperature is most relevant in order to determine the reliability of the engine?

Of course, ideally, you should measure ALL possible types of temperatures, one way or another related to a running engine. The problem, however, is that this will require the use of special laboratory environments. Since, say, it is rather difficult to measure, say, the maximum temperature of an ordinary average Ural chainsaw. Indeed, for this, a highly sensitive and, most importantly, high-speed temperature sensor will have to be placed in the block head somehow. Of course, this can be done. But. Complicated. Especially, for example, in a garage-home. For you will need to drill the block head, use argon welding, etc. And it’s not a fact that after such manipulations the saw will last a long time

One article, as well as many automotive textbooks, deals with at least TWO types of engine temperatures:

It should be noted that these are. in the general case. parameters not related to each other. It may well be that the temperature of the block head is too high, but, on the contrary, the temperature of the exhaust gases is normal. And vice versa.

In a number of other publications, including on the Internet, on the forums, alas, often it is either only about the temperature of the exhaust gases, or only about the temperature of the block head. Apparently, this is a consequence of either a reluctance to understand the issue, or a lack of opportunities for searching and analyzing information.

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So, as a criterion for temperature, we take both of those just listed. Let us accept, as a dogma, that if both of these temperatures do not go beyond the permissible limits, then the remaining temperatures and, consequently, the reliability of the two-stroke gasoline engine will also be within the specified limits, i.e. fine.

Experimental results

Now, finally, let’s consider the most interesting thing. the experimental results. The Ural chainsaw was tested when sawing wood (with a diameter of 10 to 30 cm and, sometimes, more), the following mixtures were used as fuel:

gasoline, chainsaw, ural

Before the next test, the remaining fuel was carefully drained from the gas tank, after which a mixture with a new composition was poured and the tests continued. The tests were carried out in the sequence listed above. In total, the tests took about three days during the period 5 15 July 2019. The oil was used like this, which stood in a plastic container for about 1.5 years.

Diesel fuel was purchased at Bashneft filling stations in July 2019.

Note. And what was the purpose of adding kerosene, diesel fuel (or diesel fuel)? To lower the octane number. The fact is that oil, kerosene, diesel fuel reduce the octane number. We’ll talk about this below.

If there is no 80 gasoline, can the 92 be used in two-stroke engines?

Recently, this question has worried. not to say that many, but, nevertheless, a sufficient number of equipment owners. Indeed, sometime, years ago, people (or organizations) honestly, legally acquired technology. Running on 80 gasoline (AI-80). We used this technique legally and conscientiously, took care of it, and repaired it. And, suddenly we got what is called “under the curtain”: the production of the 80th gasoline was discontinued

Is it possible to use some other types of fuel in equipment designed for 80 gasoline?

So let’s talk about this, about the purely technical side of the issue. There are two ways to answer this question:

The operating cycles of these engines are different, the characteristics, technical features are also different. Therefore, of course, one cannot recklessly apply the same thing to both types of such engines. In this article, we will focus specifically on two-stroke engines. specifically, let’s consider whether it is possible to use 92nd gasoline in two-stroke engines, specifically, in the Ural Electron chainsaw. Therefore, below we will mainly talk about it. This chainsaw has a relatively low compression ratio of the fuel mixture in the engine compared to modern chainsaws.

In general, two-stroke engines have not only chainsaws, but also some walk-behind tractors, boat motors, motor pumps, brushcutters, lawn mowers, etc. Where a low engine mass is required, where maximum power per unit of mass is important. there, as a rule, two-stroke gasoline engines are used.

How to breed gasoline for a chainsaw Ural

Preparation of the fuel mixture when working with the MP-5 “Ural-2T Electron” chainsaw

For the running-in period of the chainsaw, use a fuel mixture of gasoline and oil according to 2.3 in a ratio of 15: 1 by volume, i.e. add 1 liter of oil to 15 liters of gasoline and mix the mixture thoroughly. The amount of gasoline and oil in the fuel mixture is shown in table 1.

Hello! Glad to see you again, dear readers and subscribers of Andrey Noak’s Blog. Everyone who has a chainsaw at home already knows exactly what kind of gasoline and how to fill it. But to those who just want to buy such a unit for themselves, the article will seem entertaining.

The chainsaw is one of the most convenient and versatile household appliances. Before use, you need to prepare a fuel mixture. But for the unit to work correctly, you must follow all the manufacturer’s recommendations. Each model is individual, so which gasoline to fill in the chainsaw?

Fuel mixture

To properly prepare fuel, you will need a list of additional tools:

  • Plastic or metal container for diluting the substance;
  • Measuring bottle for gasoline;
  • Dispenser;
  • Syringe;
  • Chainsaw tank.

Some manufacturers, such as STIHL, immediately make measuring containers for a more convenient measurement of the fuel mixture.

Different manufacturers produce oils in different shades. The manufacturer HP produces a red liquid. Oil of a green hue is the premium segment “synthetics”. For your Husqvarna chainsaw, you need to use the correct brand of oil. It is of high value, good quality, and is green or blue in color.

The main thing is to correctly calculate the proportions of the mixture. Excess oil can form carbon deposits on pistons and spark plugs. Excessive gasoline can cause engine damage or piston seizure. Each manufacturer gives its own proportions to models of different power.

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How to mix fuel for chainsaw

To mix the components, you will need the aforementioned additional accessories. Also on sale you can find special canisters with two holes for oil and gasoline. Everything is very simple here, pour in the ingredients, tighten the lid tightly and mix by tilting the container. Glass and plastic bottles can be used.

Correct Way To Mix Gas and Oil For a ChainSaw, WeedEater etc.

The fuel mixture must be free from water or dust.

Good to know

Procurement of fuel must be carried out counting on 3 refueling. After all, storing a large volume of fuel can negatively affect the operation of the chainsaw. The mixture can behave in different ways, as it will be influenced by many factors. As a result, your household unit may receive serious damage, which will entail financial costs.

Sometimes even the capacity can affect the quality of the liquid. Plastic and glass react with gasoline, which can create a flash fire hazard.

It is important to remember that in case of a chainsaw breakdown due to a poor-quality or incorrect mixture, it will not be possible to repair the unit under warranty.

The finished liquid cannot be stored for more than a month, because the oxidation process takes place. After working with the chainsaw, you need to use up the remaining fuel, turn off the engine and remove the remaining fuel mixture.

Helpful hints:

The correct operation of your equipment is entirely up to you. First, do not disdain the manufacturers’ pointers or, in extreme cases, the instructions on the oil packaging. This will help avoid unpleasant situations. The neighbor does not always know what is the best way to do it. The cheapness of oil and gasoline is not an indicator of high quality, because a breakdown of a tool can be much more expensive (about 80% of the cost of a chainsaw) than the funds saved on the fuel mixture.

Making the mixture: important proportions

When using a two-stroke engine, clean fuel is purchased separately and mixed with oil, often in proportions of 1:50. It is structurally impossible to install an oil pump in such an engine, therefore, pouring pure gasoline into the chainsaw is strictly prohibited! The proportions, quantity and some brands are indicated by the manufacturer in the instructions for use.

Important points in the cooking process:

  • Domestic chainsaws work with oil M8-V, M-12TPU, M8-V, TP, MGD-14M. In some cases, you can use foreign options;
  • Proportions: 2.5 liters of FI-80 gasoline per 100 grams of oil;
  • Foreign models are distinguished by minimal fuel consumption. They work on foreign oils, and their proportions become 1:40 or 1:50.

Fuel consumption

One of the most important questions that arises from the owners of the saw tool, because everyone wants to know what he can count on.

The volume of almost all tanks is approximately 500 ml. If the power of the chainsaw is 2 kW, then the consumption of the fuel mixture will be approximately 1.2 liters per hour of operation. To put it simply, such a tool will be able to work at maximum speed for half an hour without interruption. If the chainsaw is not as powerful, then it will have a smaller tank volume. So the user can independently control the fuel consumption.

Over time, the user will learn to service his tool without any help. The main task will be to keep the economic unit in good working order, using high-quality fuel mixtures. Observe safety rules when preparing flammable liquids. This will help to preserve the instrument, as well as not harm yourself and the environment.

Under the brand

For modern brands, for example, Husqvarna, Partner, Makita, Echo, STIHL, AI-92 gasoline is suitable. Today, just a huge number of people complain about the premature failure of chainsaws due to poor gasoline. Therefore, some experts recommend pouring AI-95 into such chainsaws. At the same time, a good AI-95 can “burn the piston”, and again a certain number of people found a compromise and mix AI-95 with AI-92. In general, it all depends on the quality of gasoline and in the end it is up to you.

For domestic instruments, Ural, Druzhba, it is recommended to take AI-80 gasoline. It is very important that fuel consumption is kept to a minimum.