Features of two-stroke engines
Two and four-stroke designs are internal combustion power plants. The 2 – stroke drive carries out a full cycle of operation of the piston in the cylinder during one complete revolution of the crankshaft around its axis. During this period, the piston passes completely from bottom to top and back. This distinguishes the two-stroke design from the four-stroke analog, in which this process takes place in two turns of the crankshaft. Two-stroke units are not equipped with clean air inlet and carbon monoxide outlet valves. Injection of fuel, purging of smoke, pumping of clean air occurs due to the pressure and vacuum created by the piston during operation.
The two-stroke engine combines cleaning and cylinder filling. This does not occur in separate steps, but is performed in a short period of time, with the piston approaching its lower position. During its movement, it opens the outlet and purge channels. An additional equipment for this is a blowdown pump..
The two-stroke engine has a liter capacity more than the 4-stroke, about 1.7-1.9 times. This value is obtained because with the same number of revolutions and cylinders, the working stroke of the pistons is twice as fast..
A negative feature of a two-stroke unit is the ability to overheat. This is a consequence of the generation of a large amount of heat during operation. To dissipate heat, characteristic ribs are made on the engine block. The air flow acts on the fins, which cool the engine. In addition, forced cooling can be applied.
Two-stroke engine oil
But at the same time, it is advisable to pay attention to it that it was indicated that the oil is not just for two-stroke engines, but also the fact that if you, for example, have a chainsaw, then something like “recommended for two-stroke engines of chainsaws” is written there, since these devices are considered to be under increased stress. Any oil for two-stroke engines is suitable for a trimmer.
Well, I also make sure that the recommended mixing ratio is 1:50, and not, say, 1:80.
Well, speaking about oil for two-stroke engines, I would also like to note that there is no point in using the original branded oil, which the manufacturer of your chainsaw or trimmer insists on. This is all marketing and often branded oil is just some ordinary oil from one of the many manufacturers who have an agreement with the brand of your motorcycle and, accordingly, their label is a big name and the price is three times more expensive.
Well, in conclusion, it is worth noting that you should not store the prepared fuel mixture for a long time, the fact is that the oil dissolved in gasoline does not retain its properties for a very long time. Additives, etc., can be destroyed. Therefore, it is optimal to store the prepared mixture for no more than a month, and maximum no more than three. As an indirect reference point of suitability, the absence of sediment and stratification of the mixture can be considered.
API classification:
- TSC-1 – TA – this engine oil assumes entry into this group of all lubricants for small engines with a volume of not more than 50 cc. Motors can be used in electric generators, mowers and other elements.
- TSC-2 (B) – this class contains oils used for engines with a volume of 50 cc. These units are air-cooled and can operate at high loads..
- TSC-3 (C) – This engine oil assumes lubricants used for two-stroke engines, which have particularly high demands on the level of lubricant quality. Such products are used for engines with a volume of 50-200 cubic meters. cm, mainly – on motorcycles, snowmobiles.
- TSC-4 (TD) are consumables that are often used in outboard engines – in motor boats and so on, equipped with water cooling.
Running in
A new chainsaw immediately after purchase has a slightly lower performance than similar models that have been in operation. The rated power of the engine is reached only after 6-10 full tanks of the fuel mixture have been used up..
However, it should be noted that running in an imported chainsaw (Husqvarna, Stihl, Partner) has significant differences over domestic chainsaws. So, for example, it is not necessary to develop several tanks of the fuel mixture at idle speed. Running-in consists of cyclic work with a minimum load on the motor: first, the sawing of soft wood is carried out for 1-2 minutes, then 20-30 seconds of idling. This prevents the formation of a large layer of burn-on that occurs during prolonged operation of the chainsaw at idle speed..
How to Store Your STIHL Gas Powered Equipment
Chainsaw break-in must be carried out on high-quality AI-92 gasoline without any additives and branded oil, which is recommended by a specific manufacturer. You can find out what and how much oil you need to fill in gasoline for a chainsaw in the instructions for the chainsaw itself.
In no case should products intended for low-speed engines be diluted with gasoline, as in the photo..
The proportion of oil and gasoline for a chainsaw of the corresponding brand:
- STIHL with power less than 1.5 kW – (1:40);
- STIHL with a power of more than 1.5 kW – (1:50);
- Partner – (1:33);
- Husqvarna with power less than 1.5 kW – (1:40);
- Husqvarna with a power of more than 1.5 kW – (1:50);
- Jonsered – (1:33).
The prepared mixture can be stored for up to two months, and then there is a risk of engine breakdown due to the inevitable decrease in the octane number of gasoline.
My secret How to dilute fuel for two-stroke engines. How to dilute chainsaw gasoline
Oil Motul for outboard motors 2t semi-synthetic Motul Outboard Tech 2T
This semi-synthetic engine oil behaves perfectly when filled in high-powered two-stroke engines and in direct injection engines, regardless of the oil mixing system (Yamaha, Mariner, Evinrude, etc.). The product is well designed and exceeds the requirements of the respected NMMA TC-W3 benchmark for jet and outboard motors. The fact is that it was developed using a special Technosynthese technology. This gives improved operational parameters, increases the service life of the components..
The formula mixes almost instantly with gasoline, does not cause any deposits in injection systems, and does not form carbon deposits on spark plugs. Throughout the entire period of use, the oil remains stable. The product has a characteristic blue color, which makes it easier to control the fuel mixture. For use with unleaded gasoline. It is recommended to mix the oil in a ratio of 1-2% in accordance with the operating conditions and the requirements of the engine manufacturers. Packaging – canister 1 l. .
- successfully works on 2-stroke direct injection engines and water jet engines;
- suitable for expensive and cheap motors;
- mixes well;
- during operation, the engine practically does not smoke;
- the motor runs smoothly;
- reduction of wear.
Cons not found.
How to properly store a mixture of gasoline and oil.
Separately, in pure form, gasoline and 2-stroke oil can be stored within the manufacturer’s expiration date. Usually it is 5 years for oil, but this applies to hermetically sealed containers.
To properly store the fuel mixture, it is necessary to exclude its contact with air and moisture (water), as well as to avoid sudden temperature changes. For long-term storage, it is advisable to use gasoline produced in the summer season..
It is advisable to save oil and fuel mixture in shaded areas to exclude the influence of ultraviolet radiation.
It is preferable to store both pure gasoline and the mixture in a hermetically sealed steel canister. This recommendation coincides with the opinion of gardeners who prefer not to drain fuel from garden equipment, but to store it all winter in tanks..
In conclusion, the mixture cannot be stored for a long time …
Two words about storing dry infant formula
As everyone understands, the ready-made diluted mixture is obtained from the dry one. Before you know how much you can store ready-made infant formula, you need to understand how to store the formula dry. The manufacturer on the packaging indicates the period of permissible storage. But mommies should know that after the pack is open, this data will no longer work. Typically, the mixture is packaged in opaque cans that are fairly simple to close. with rubber caps. Sometimes you come across mixtures in glass jars. If the manufacturer is trying to reduce the cost of production, he will limit himself to the use of cardboard in the manufacture of suitable packaging, using a foil bag inside.
What to store?
So how long can you store the finished mixture in a bottle? The bottle must be thoroughly sterilized and then it will not be necessary to pour the mixture into another container. To keep the bottle warm longer, you just need to wrap it up. Pediatricians allow you to store the mixture in a thermos, but, as a rule, it is better not to pour it. It is not necessary for the formula to be lukewarm. There are kids who like to drink it cool, of course, not coldish. The temperature of the food will not in the least affect their digestion or the quality of food..
As an option – a special bag for bottles, made according to the principle of a simple thermos. It will keep the mixture warm for about three hours. And yet, despite such convenience, mothers with experience usually take a bottle of warm water and a dry mixture with them: dilute and shake – it does not take much time.
How long can the finished mixture be stored? Terms and conditions of storage
A rather important aspect, on which the health of a little person is directly dependent, is the storage of infant formula. After all, she will be the faithful assistant to mothers who, due to various circumstances, do not have the slightest opportunity to feed their relatives and beloved babies with breast milk. But it is the mixtures that can potentially harm the body of babies, because there is always the possibility that bacteria will get into them. That is why it is so important to understand and know how much a ready-made mixture can be stored, how to store it and how to dilute it..
How to store the diluted mixture correctly?
Although pediatricians admit that you can store the prepared mixture a little, it is best to take with you (for example, for a walk) dry mixture and water at the required temperature. You can cook it quite quickly, otherwise everything will be the safest for the health of the little one..
All mothers should have an idea of how much the ready-made mixture can be stored, because it is unacceptable to expose your baby to dangers. In a warm environment, many different bacteria multiply quite well, therefore, after a very short time after preparation, the mixture is unsuitable for feeding the baby. For the same reason, it is unacceptable to store the mixture that the crumb has not finished drinking or has just touched the nipple with sponges. Bacteria could already get into it, therefore, after a while, it is already forbidden to feed the baby with this mixture. Young mothers need to remember that a baby cannot be fed with the same mixture more than once. If there is food left, you just need to pour it out.
Term and temperature
In a tin or glass container, the dry mixture remains approved for use during the entire storage period. But it is unacceptable to leave the mixture in paper packaging. You can’t just pinch the edges of the package with a clothespin, because pest larvae or bacteria often get inside. The powder can be poured into a dry, opaque jar, in which the lid will close tightly. This is the most optimal option for what it is permissible to store open infant formula..
If the place is dark and dry, then the mixture will be stored in a jar for three weeks at a temperature of 14 to 24 o C. This, of course, is not enough, but when vitamins come into contact with air, they are capable of disintegrating, therefore, the longer the mixture is stored, the more its vitamin value will decrease.
How we store in the summer?
How and how much can you store ready-made milk formula when the summer heat is outside the window? Temperatures are high all the time, so liquids can deteriorate much faster. It is not necessary to leave the mixture for a long time in a room in which the air temperature exceeds 20 degrees. Experienced mothers can give advice: keep in the refrigerator by choosing one of the shelves. Of course, the question may arise: why not put the mixture on the refrigerator door? The answer is simple. When the door is opened, a rather serious temperature difference begins, and the consequence of this is spoiled liquid.
How long can you store the ready-made mixture in the refrigerator? If you put it on the middle shelf, then the maximum shelf life is 24 hours..
How is the cooking process going?
Of course, when an artificial baby appears in the family, it is quite important for the mother not only to understand how long the ready-made mixture can be stored, but also how it must be prepared. If mom is new to this business, she may feel some difficulty..
First you need to prepare the water: boil it on the stove thoroughly enough, but you cannot keep it on fire for more than half an hour. When the liquid boils, it should be removed from the stove and set aside so that the water cools down for several minutes to 35-40 ° C.
After that, pour the water into a bottle and pour the adapted nutrient admixture into it. Close the bottle very tightly so that air does not penetrate inside. Now you can shake the bottle several times so that the mixture is stirred in the water and there are no lumps at the bottom. If the mixture is prepared correctly, it should have a uniform consistency..
Before using such food, you should check what temperature it is. The finished mixture should have about 35 ° C of heat. To check, you need to drop a couple of drops of liquid on any of the sensitive areas – for example, the wrist. Mom should not feel a burning sensation after the mixture has got on the skin.
How to store formula in summer
The hardest part is to preserve cooked food for babies during hot summer days. Due to the high temperature, such liquids deteriorate faster and therefore it is not recommended to leave them for a long time in rooms with temperatures above 20 degrees. Experienced mothers are advised to store them in refrigerators, on one of the shelves. Of course, containers with gruel can also stand on the refrigerator doors. However, when the doors are opened, a serious temperature difference appears, due to which the liquid will quickly deteriorate..
How to store diluted infant formula
First you need to figure out what to store baby powder after dilution in water. Some mothers prefer to leave food directly in the bottle and not pour it anywhere..
However, when using such a storage container, you will have to sterilize it in advance so that the mixture does not deteriorate quickly at room temperatures..
Also, for the safety of ready-made baby food, a regular thermos for warm drinks is used. It is much easier to keep the gruel warm in such a container..
The best option for long-term storage of infant formula is a special bottle bag. The main advantages of these bags include:
RYOBI: How to mix and store 2 stroke fuel
- reliability;
- compactness;
- temperature control.
Storage rules
Every young mother should know the shelf life of prepared baby food for feeding her baby, since spoiled food can harm the baby’s health. Having dealt with the nuances of storing nutrient fluid in the room, it will be possible to keep it longer than usual..
Why the mixture cannot be stored for a long time?
Some young mothers prefer to prepare the mixture in advance in order to keep it ready for longer. However, you should not do this, as warm liquids increase the number of harmful bacteria that lead to colic and bloating in babies. Baby food is high in fat and protein and is therefore considered an ideal breeding ground for dangerous bacteria. The reproduction of harmful microorganisms begins if the prepared and usable liquid is stored for more than one hour at temperatures above 20 degrees. They also multiply with regular heating on a gas stove or microwave..
How long can you store diluted infant formula in a bottle?
Sooner or later, the baby is transferred to artificial feeding with various milk formulas. After switching to such a diet, many young mothers are interested in how much the mixture diluted in a bottle can be stored. To answer this question, you need to get acquainted in more detail with the features of artificial feeding of children..
How to keep infant formula warm
Some girls try to keep the liquid for the newborn warm. In this case, its shelf life should not exceed three hours, since it is after 3-4 hours that it begins to deteriorate. To maintain the temperature of the milk mixture, wrap the container with liquid with parchment paper or a towel..
A thermos or a special heat-resistant bag for storing baby bottles will also help to maintain the required temperature of the liquid..
With their help, you can keep food warm not only at home, but also on the road..
About the process of preparing the mixture
For inexperienced moms, preparing the infant feed mix is a rather tricky process. Therefore, they should figure out in advance how she prepares..
The liquid preparation procedure begins with water preparation. To begin with, it must be thoroughly boiled on a gas stove. At the same time, water cannot be kept on fire for more than half an hour. When the liquid boils, it is removed from the stove and left to cool down to 35-40 degrees. The cooled liquid is poured into a baby bottle, after which an adapted nutritional impurity is poured into it. Then the container is tightly closed with a lid so that air does not penetrate into it..
To thoroughly stir the mixture in water, the baby bottle is carefully screwed up and shaken several times..
If, after shaking, the powder does not dissolve in water and has gathered at the bottom in lumps, you will have to shake the bottle 2-3 more times. Properly prepared nutrient fluid should have a uniform consistency..
Before using prepared food, check its temperature. It should be about 35 degrees. For testing, it is recommended that 1-2 drops of liquid be applied to the wrist, elbow or other sensitive area. A person should not feel a burning sensation after contact of liquid on the skin.
How long the prepared mixture is stored
To understand the shelf life of baby food, you need to familiarize yourself with the shelf life of mixtures from the most famous manufacturers..
Among the popular manufacturers of baby food, the following are distinguished:
- Nutrilon. Such uncooked baby food can be stored for no more than 3 or 4 weeks. The finished liquid is stored much less. On the packaging you can find information according to which the powder diluted with water should be used within the next hour..
- “Nan”. Compared to “Nutrilon”, such food is stored a little longer. The manufacturer advises to store unopened packaging no longer than a month. Cooked food can be stored at 15-20 degrees for two hours.
- Similak. Opened packaging of baby food can be stored for two and a half weeks at room temperature and about 70% humidity. After cooking, the gruel lasts only an hour and a half.
- “Nanny”. The packaging with the products of this manufacturer indicates that it must be used within a month. Cooked food is stored in the refrigerator for two hours..
- “Unsigned”. Like most other impurities, Nestogen products are stored in packaging for 25-30 days. Cooked food starts to deteriorate within three hours..
How long can you store the prepared mixture?
The shelf life of the ready-made mixture is no more than two hours, provided that the baby has not eaten from this bottle yet. In this case, the storage of the diluted infant formula should take place in the refrigerator, since at room temperature the resulting liquid can turn sour.
If the baby has already eaten, and there is still a little mixture in the bottle, then the rest of the mixture must be poured out, and in the next feeding prepare a new portion.
Many mothers think that if a child asks for food again after an hour, then you can give him the same mixture that he did not finish in the previous feeding. However, this should not be done, because even for such a short period of storage of the mixture, it can deteriorate, as a result of which the baby may become poisoned..
How long can you store the prepared mixture?
If a small child was born in the family, and he is artificially fed, then in addition to the question of choosing a brand of milk formula, the young mother wants to know how long the ready-made formula for the baby can be stored.
Why it is impossible to store the formula for a long time?
If the milk mixture is kept at room temperature for a long time, then harmful bacteria begin to multiply in it, which can cause bloating, colic and even intestinal disorders (dysbiosis) in the baby. The ready-made mixture is an excellent breeding ground for the spread of pathogenic bacteria, as it contains a large amount of proteins and fats..
It is also not recommended to reheat the formula in the microwave as it may heat up unevenly. If, nevertheless, a situation arises when it is necessary to take the milk mixture with you for future use, then it is better to do as follows: pour warm boiled water into a separate thermos, and pour the required amount of the mixture into a bottle in advance. If necessary, all that remains is to add water to it, and the fresh milk mixture will be ready.
Parents should remember that although it is convenient for them to make milk formula for the baby several feedings in advance, this can have a detrimental effect on him. The child should be given a freshly prepared portion of infant formula. This will avoid an excessive load on the baby’s gastrointestinal tract and poisoning of the body, since improper storage conditions of the milk formula contribute to the development of pathogenic bacteria.