Смесь бензина и масла для двухтактных двигателей: Соотношение масла и бензина в 2т двигателе: таблица, правила смешивания

Пропорция бензина и масла для двухтактного двигателя 1 к 50: это сколько масла, правила приготовления смеси

• 4 Апреля, 2019
• Разное
• Людмила Стороженко

Существуют определенные параметры для смешивания бензина с масляным составом. Это основной вид горючего для двухтактных двигателей. Полученное топливо обеспечивает работу мотора на долгий срок, и тем самым сохраняет его продуктивность. Как смешивать необходимые ингредиенты в пропорции 1 к 50, это сколько масла, будет рассмотрено далее.

Что нужно знать?

Выбор правильного соотношения для топливной массы не является простой задачей. Нужно рассчитать пропорции смешивания в соответствии с установленной нормой. Порой водители добавляют ингредиенты по своему усмотрению. В это же время дисциплинированные собственники транспортных средств, которые беспокоятся о двигателе, знают, что рекомендована пропорция 1 к 50. Это сколько масла? Ответ на этот вопрос вы найдете далее.

Для смешения ингредиентов нужно руководствоваться простыми правилами. Чтобы разбавить бензин маслом 1 к 50 рекомендуется использовать топливо марки А-92. Зачастую используют А-80, объясняя такое действие наличием в его составе большого количества присадок. Это в корне неправильно.

Масло практически любого производства подходит для смешивания с топливом. Главное, чтобы оно относилось к автогруппе, а не было предназначено для тракторов или моторных лодок. Такое масло применять не стоит. В противном случае оно явно сократит срок службы двигателя.

Рекомендации по приготовлению

Большинство водителей знает, что двухтактный двигатель работает на бензино-масляном топливе. Поэтому рекомендуется соблюдать пропорции, которые указаны в техпаспорте продукта.

Разумеется, что некоторые владельцы транспортных средств, обладающие большим опытом, создают пропорцию «на глаз». Однако каждый раз подобная масса будет иметь различное соотношение. Это неблагоприятно скажется на работе мотора. Поэтому нужно ознакомиться с инструкцией на упаковке.

Рекомендованные требования к эксплуатации смеси:

1. Не следует снижать количество масляного компонента при смешивании с топливом. Нужно придерживаться пропорции 1 к 50. Это сколько масла? Нужно знать точное количество до заливки смеси в картер. Масло – компонент не из дешевых, поэтому на нем нередко пытаются сэкономить. Но это может поспособствовать сильному нагреву системы. Поэтому следует соблюдать пропорции масла. Также из-за недостаточного количества этого компонента могут появиться задиры, что заметно снижает продолжительность эксплуатации мотора.
2. Также не следует использовать и обильное количество масла. Превышение его объема является негативным фактором для работы двигателя. Это приводит к быстрому износу мотора, к увеличению нагара.
3. Не рекомендуется хранить подготовленную топливную смесь больше 30 дней. В противном случае она теряет нужные свойства, и ее использование значительно снизит срок службы двигателя.
4. Требуется следить, чтобы не было попадания пыли, грязи в состав, так как это тоже негативно отразиться на работе мотора.

Пропорции смешивания

Часто стандартные пропорции смешивания указываются на емкости с маслом. И в основном используется соотношение 1 к 50. Это сколько масла следует добавить, рассмотрим ниже. Возможно небольшое отклонение от представленного соотношения. Но лучше придерживаться точных дозировок.

Итак, производители рекомендуют придерживаться пропорции 1 к 50. Это сколько масла нужно разбавить с бензином? Соотношение представленной пропорции достаточно простое:

• 1 л бензина и 20 мл масла;
• 1,5 л горючего и 30 мл масла;
• 2 л топлива и 40 мл масла.

Для расчета применяется формула: 1 л / 50 * 1 000 = 20 мл.

Поэтому на литр бензина нужно 20 мл масла.

Для удобства можно воспользоваться медицинским шприцем для точного измерения объема смазочного состава или взять другую мерную емкость с делениями в миллилитрах.

90000 How to Mix 2-Cycle Engine Oil: eReplacementParts.com 90001 90002 Mixing oil in the fuel of a 2-cycle engine is necessary to prevent damage, and this article explains the steps and tips to mix 2-cycle oil correctly. 90003 2-cycle engines power thousands of lawn & garden tool models, and every 2-cycle engine is lubricated 90004 through its fuel system 90005. This means that special 90004 2-cycle engine oil must be mixed with the gasoline in 2-stroke engines 90005 in order for them to stay cool during operation.90002 Running a 2-cycle engine with the wrong gas / oil mixture can seriously damage your equipment, and running one without 90009 any 90010 oil in the fuel will completely destroy your tool’s engine in minutes. Many tool users have questions about oil / gas mixtures in 2-cycle engines, and 90004 many engines require different mixture ratios 90005. This article explains what tool owners need to know to properly mix oil into the fuel of their 2-cycle engine equipment. Mixing steps, engine mixture ratios, gasoline storage procedures, and damage prevention tips are explained below. 90013 90004 How Long Does Gasoline Keep? 90005 90016 Using “new” gasoline in a gas-powered engine is not always the same as using 90004 fresh gasoline 90005. The gas you pour into your equipment’s fuel tank might be “new” because it just came from the gas can, 90004 but how long has the gasoline in your can been sitting there? 90020 90005 Many tool owners are unaware that gasoline expires. The general rule of thumb is that 90004 gasoline can store for three to six months 90005 before becoming unhealthy for use in engines.After a few months, gasoline begins to break down and loses the full potency of its combustible properties. Using old gasoline will reduce the power output of your tool’s engine, and it can also cause excessive build-up of impurities in an engine’s parts. Here are some 90004 tips for proper gasoline storage 90005 and use: 90003 90027 90028 Discard gasoline after storing it for three to six months. Discarding any remaining gasoline in your garage or shed at the start of each season is a smart habit to develop.90029 90030 90027 90028 If you store your gas-powered equipment with fuel inside their gas tanks, 90004 use a fuel stabilizer 90005 to protect the carburetors of your tool engines. 90029 90030 90027 90028 Even if you use a fuel stabilizer in your tool engines when you store them, discard the gasoline at the start of the next season. It’s only there to keep your carburetor from drying up. 90029 90030 90027 90028 If you’re determined to store gasoline for long periods of time, use a fuel stabilizer.Many tool owners mix stabilizer in their fuel just as a general practice. Fuel stabilizer can extend the life of stored gasoline up to several more months. 90029 90030 We mention this gasoline storage issue in this article because taking all the care in the world to mix oil correctly in your 2-cycle engine will only solve one problem (lubrication). [Back to top] 90020 90013 90004 2-Cycle Oil / Gas Mixture Ratios: Then and Now 90020 90005 90016 Every 2-cycle engine has a specific gas / oil mixture ratio, so the 90004 first step 90005 in mixing your 2-cycle engine oil 90004 is determining the correct ratio 90005 for your tool’s engine.Most 2-cycle tools display the correct gas / oil ratio somewhere on the tool, usually the engine housing. If not, the tool’s owner manual will have the ratio information. If the tool’s owner manual is misplaced, most manuals can be accessed on manufacturer websites. 90013 Measuring for 2.6 Ounces of 2-Stroke Oil 90020 90016 Almost every 90004 newer 2-cycle engine 90005 uses a 90004 50/1 90005 gas to oil ratio, as opposed to older tools that use more oil. This is because the lawn & garden industry is designing cleaner-running gas engines. 90004 Older 90005 gas-powered tools may use gas / oil ratios of either 90004 40/1 90005 or 90004 32/1 90005. 90004 Here’s the catch 90005: because the industry is shifting heavily towards 50/1 ratio 2-cycle engines, most of the 2-cycle engine oil products available on the market today are sized so that an entire bottle can be conveniently added to round gallon figures (like 1 gallon), producing a 50/1 mixture. For example, the 2-cycle engine oil products pictured below come in 2.6 oz. bottles.2.6 ounces of oil is exactly the quantity needed to produce a 50/1 mixture with exactly 1 gallon of gasoline. Larger, 6.4 oz. 2-cycle oil bottles are also available for mixture with exactly 2 and 1/2 gallons of gasoline, again producing a 50/1 mixture. 90002 Because 90004 the 2-cycle oil market favors container sizes geared toward 50/1 gas / oil mixtures 90005, you will have to do some extra careful measuring if your 2-cycle engine accepts a 40/1 or 32/1 mixture. Most of the oil bottle sizes on the market are 2.6 ounces (for 1-gallon 50/1 mixtures). Because it is much easier to accurately measure larger volumes of gasoline (as opposed to small volumes of oil), we’ve expressed our measurements for 40/1 and 32/1 mixtures below so that tool owners can simply add an entire 2.6 oz. bottle of oil to a modified quantity of gasoline. Measuring out the gasoline is much easier than measuring out the oil. One last comment. The best case scenario is obviously a precise mixture measurement. That being said, it’s always best to mix more oil than less oil if you’re unsure.90003 90002 90004 50/1 Mixture Measurements: 90005 90003 90002 2.6 ounces of 2-cycle oil 90004/90005 1 gallon of gasoline 90003 90002 90004 40/1 Mixture Measurements: 90005 90003 90002 2.6 ounces of 2-cycle oil 90004/90005 0.8 gallons (approx. 103 ounces) of gasoline 90003 90002 90004 32/1 Mixture Measurements: 90005 90003 90002 2.6 ounces of 2-cycle oil 90004/90005 0.65 gallons (approx. 84 ounces) of gasoline [Back to top] 90020 90013 90004 2-Cycle Engine Oil Mixing Steps 90005 90016 2-cycle engine oil must be mixed with gasoline in a separate gas container in order for it to mix correctly.90004 Never mix 2-cycle oil directly into the fuel tank of your tool’s engine 90005. Here are the steps: 90003 90002 90004 1. 90005 The 90004 oil 90005 should always be 90004 added first 90005. 90003 90002 Pour the correct, pre-measured amount of 2-cycle engine oil into a clean, appropriately-sized gasoline container. 90003 90002 90004 2. 90005 Add the correct amount of gasoline to the oil. 90003 90002 90004 3. 90005 Seal the gas container and 90004 gently swish 90005 it until the oil completely mixes.90004 Do not shake 90005 the gas container. These steps are very simple, but it’s still important to take care to perform them in the correct order. [Back to top] 90013 90004 2-Cycle Oil and Engine Damage 90005 90016 Mixing too much oil in your 2-cycle engine is much less damaging to the engine than mixing too little oil. If there’s only a little too much oil in the mixture, you may not notice any difference in your tool’s performance at all. The important thing is that it’s being lubricated. If a lot of extra oil is mixed in the fuel, there are some symptoms that might appear: 90003 90027 90028 smoky exhaust 90029 90028 oil out the muffler 90029 90028 loss of engine power 90029 90030 Fixing any of these problems is as easy a discarding the over-oiled fuel and replacing it with fuel mixed at the proper ratio. Mixing too little oil in your 2-stroke engine is very dangerous for your tool’s engine. Running a 2-cycle engine without any oil in the fuel will completely destroy the engine in minutes.The engine’s piston and cylinder become extremely hot without lubrication through the fuel system. Without any oil at all, the metal of these precisely-shaped and -sized parts actually melts and then transfers material back and forth between the piston and cylinder. When metal transfers between the moving parts of an engine like this because of heat, it is called galling. 90004 Galling 90005 distorts the shapes of the piston and cylinder. 90002 You’ll know that it’s happened almost immediately, because the engine will seize and become permanently unusable.90004 Mixing too little oil in you 2-cycle engine will similarly damage your tool’s engine, but over a longer period of time. 90020 90005 Lack of engine power is the most prominent sign that a 2-cycle engine is running on too little oil. Permanent damage can be prevented if the problem is corrected early, but such an outcome would be very fortunate. This is why it is so important to mix your 2-cycle engine oil at the correct ratio for your tool. Using fresh fuel and the correct oil / gas mixture ratio prevents all of these potential problems.90004 Watch 90005 this article’s 90004 demonstration video 90005 to see what happens when a 2-cycle engine is run without oil in the fuel: 90003 90002 90002 90152 90153 90003 [Back to top] 90013 90004 Conclusion 90020 90005 90016 eReplacementParts.com stocks parts for thousands of 2-cycle engines and other Small Engine Parts used in power tools and equipment of all kinds. Our website’s breakdown schematics, how-to articles, and Repair Forum are here to give tool owners all the information tools they need to keep their engines running at a level of professional maintenance. [Back to top] What we’re about. 90003.90000 Gasoline engine | Britannica 90001 90002 90003 Gasoline engine 90004, any of a class of internal-combustion engines that generate power by burning a volatile liquid fuel (gasoline or a gasoline mixture such as ethanol) with ignition initiated by an electric spark. Gasoline engines can be built to meet the requirements of practically any conceivable power-plant application, the most important being passenger automobiles, small trucks and buses, general aviation aircraft, outboard and small inboard marine units, moderate-sized stationary pumping, lighting plants, machine tools, and power tools.Four-stroke gasoline engines power the vast majority of automobiles, light trucks, medium-to-large motorcycles, and lawn mowers. Two-stroke gasoline engines are less common, but they are used for small outboard marine engines and in many handheld landscaping tools such as chain saws, hedge trimmers, and leaf blowers. 90005 Cross section of a V-type engine. 90006 Encyclopædia Britannica, Inc. 90007 90008 Engine types 90009 90002 Gasoline engines can be grouped into a number of types depending on several criteria, including their application, method of fuel management, ignition, piston-and-cylinder or rotor arrangement, strokes per cycle, cooling system, and valve type and location.In this section they are described within the context of two basic engine types: piston-and-cylinder engines and rotary engines. In a piston-and-cylinder engine the pressure produced by combustion of gasoline creates a force on the head of a piston that moves the length of the cylinder in a reciprocating, or back-and-forth, motion. This force drives the piston away from the head of the cylinder and performs work. The rotary engine, also called the Wankel engine, does not have conventional cylinders fitted with reciprocating pistons.Instead, the gas pressure acts on the surfaces of a rotor, causing the rotor to turn and thus perform work. 90005 90003 gasoline engines 90004 Gasoline engine types include (A) opposed-piston engines, (B) Wankel rotary engines, (C) in-line engines, and (D) V-8 engines. 90006 Encyclopædia Britannica, Inc. 90007 90002 Most gasoline engines are of the reciprocating piston-and-cylinder type. The essential components of the piston-and-cylinder engine are shown in the figure. Almost all engines of this type follow either the four-stroke cycle or the two-stroke cycle.90005 Typical piston-cylinder arrangement of a gasoline engine. 90006 Encyclopædia Britannica, Inc. 90007 90008 Four-stroke cycle 90009 90002 Of the different techniques for recovering the power from the combustion process, the most important so far has been the four-stroke cycle, a conception first developed in the late 19th century. The four-stroke cycle is illustrated in the figure. With the inlet valve open, the piston first descends on the intake stroke. An ignitable mixture of gasoline vapour and air is drawn into the cylinder by the partial vacuum thus created.The mixture is compressed as the piston ascends on the compression stroke with both valves closed. As the end of the stroke is approached, the charge is ignited by an electric spark. The power stroke follows, with both valves still closed and the gas pressure, due to the expansion of the burned gas, pressing on the piston head or crown. During the exhaust stroke the ascending piston forces the spent products of combustion through the open exhaust valve. The cycle then repeats itself. Each cycle thus requires four strokes of the piston-intake, compression, power, and exhaust-and two revolutions of the crankshaft.90005 90003 internal-combustion engine: four-stroke cycle 90004 An internal-combustion engine goes through four strokes: intake, compression, combustion (power), and exhaust. As the piston moves during each stroke, it turns the crankshaft. 90006 Encyclopædia Britannica, Inc. 90007 Get exclusive access to content from our тисяча сімсот шістьдесят вісім First Edition with your subscription. Subscribe today 90002 A disadvantage of the four-stroke cycle is that only half as many power strokes are completed as in the two-stroke cycle (90029 see below 90030) and only half as much power can be expected from an engine of a given size at a given operating speed.The four-stroke cycle, however, provides more positive clearing out of exhaust gases (scavenging) and reloading of the cylinders, reducing the loss of fresh charge to the exhaust. 90005 .90000 Two stroke engine – Energy Education 90001 90002 Figure 1. 2-stroke internal combustion engine 90003 [1] 90004 90005 As the name implies, the 90006 two stroke engine 90007 only requires two piston movements (one cycle) in order to generate power. 90003 [2] 90004 The engine is able do produce power after one cycle because the exhaust and intake of the gas occurs simultaneously, 90003 [3] 90004 as seen in Figure 1. There is a valve for the intake stroke that opens and closes due to changing pressures.In addition, due to its frequent contact with moving components, the fuel is mixed with oil to add lubrication, allowing smoother strokes. 90012 90005 Overall, a two-stroke engine contains two processes: 90012 90015 90016 90006 Compression stroke: 90007 The inlet port opens, the air-fuel mixture enters the chamber and the piston moves upwards compressing this mixture. A spark plug ignites the compressed fuel and begins the power stroke. 90019 90016 90006 Power stroke: 90007 The heated gas exerts high pressure on the piston, the piston moves downward (expansion), waste heat is exhausted.90019 90024 90005 The thermal efficiency of these gasoline engines will vary depending on the model and design of the vehicle. However in general, gasoline engines convert 20% of the fuel (chemical) energy to mechanical energy-in which only 15% will be used to move the wheels (the rest is lost to friction and other mechanical elements). 90003 [4] 90004 90012 90005 Compared to four stroke engines, two strokes are lighter, more efficient, have the ability to use lower-grade fuel, and more cost-efficient.90003 [2] 90004 Therefore, the lighter engines results in a higher power-to-weight ratio (more power for less weight). However, they lack the maneuverability possible in four stroke engines and require more lubrication. This makes two stroke engines ideal for ships (need to carry a lot of cargo) 90003 [2] 90004, motorcycles, and lawn mowers-whereas a four stroke would be ideal for automobiles like cars and trucks. 90012 90035 The Otto Cycle 90036 Figure 2. Real otto cycle for a two stroke engine.90003 [5] 90004 90039 Figure 3. The ideal otto cycle for a gasoline engine. 90003 [6] 90004 90005 The pressure volume diagram (PV diagram) that models the changes the fuel-air mixture undergoes in pressure and volume in any gasoline engine is called the Otto cycle. The changes in these will create heat, and use this heat to move the vehicle or machine (hence why it’s a type of heat engine). The Otto cycle can be seen in Figure 2 (real Otto Cycle) and Figure 3 (ideal Otto Cycle). The component in any engine that uses this cycle will have a piston to change the volume and pressure of the fuel-air mixture (as seen in Figure 1).The piston gains motion from combusting the fuel (where this happens is explained below), and an electric boost at the start up of the engine. 90012 90005 The following describes what occurs during each step on the PV diagram, in which the combustion of the working fluid-gasoline and air (oxygen), and sometimes electricity, changes the motion in the piston: 90012 90005 90006 Ideal cycle-green line: 90007 Referred to as the 90049 intake phase 90050, a two-stroke engine 90049 does not 90050 go through this phase.This is because four stroke engines begins with the piston drawn up, so it must be drawn down to intake the fuel-air mixture. However, a two-stroke engine can proceed with intaking the fuel-air mixture right away as seen in Process 1 to 2. 90012 90005 90006 Process 1 to 2: 90007 During this phase, the inlet port opens, and the piston will be drawn up, so it can compress the fuel-air mixture that entered the chamber. The compression causes the mixture to increase slightly in pressure and temperature-however, no heat is exchanged.In terms of thermodynamics, this is referred to as an adiabatic process. When the cycle reaches point 2, it is when the fuel is met by the spark plug to be ignited. 90012 90005 90006 Process 2 to 3: 90007 This is where combustion occurs due to the ignition of fuel by the spark plug. The combustion of the gas is complete at point 3, which results in a highly pressurized chamber that has lots of heat (thermal energy). In terms of thermodynamics, this is referred to as an isochoric process.90012 90005 90006 Process 3 to 4: 90007 The thermal energy in the chamber as a result of combustion is used to do work on the piston-which pushes the piston down-increasing the volume of the chamber. This is also known as the 90049 power stoke 90050 because it is when the thermal energy is turned into motion to power the machine or vehicle. 90012 90005 90006 Purple line (Process 4 to 1): 90007 From process 4 to 1 all the waste heat is expelled from the engine chamber. As the heat leaves the gas, the molecules lose kinetic energy causing the decrease in pressure.90003 [7] 90004 However, there is no exhaust phase in a two stroke engine, so the cycle begins (1 to 2) again by allowing a new mixture of fuel and air to be compressed. 90012 90035 For Further Reading 90036 90035 References 90036 90015 90016 ↑ “File: Two-Stroke Engine.gif – Wikimedia Commons”, Commons.wikimedia.org, 2018. [Online]. Available: https://commons.wikimedia.org/wiki/File:Two-Stroke_Engine.gif.[Accessed: 17- May- 2018]. 90019 90016 ↑ 90003 2.0 90004 90003 2.1 90004 90003 2.2 90004 E. Alturki, “Four-Stroke and Two-Stroke Marine Engines Comparison and Application”, International Journal of Engineering Research and Applications, vol. 07, no. 04, pp. 49-56 2017. 90019 90016 ↑ C. Wu, Thermodynamics and heat powered cycles. New York: Nova Science Publishers, 2007 90019 90016 ↑ R. Wolfson, Energy, environment, and climate. New York: W.W. Norton & Company, 2012 p. 106. 90019 90016 ↑ http://www.citethisforme.com 90019 90016 ↑ Wikimedia Commons [Online], Available: https: // en.wikipedia.org/wiki/Otto_cycle#/media/File:P-V_Otto_cycle.svg 90019 90016 ↑ I. Dinçer and C. Zamfirescu, Advanced power generation systems. London, UK: Academic Press is an imprint of Elsevier, 2014 року, p. 266. 90019 90024 .90000 Gasoline engine | Britannica 90001 90002 90003 Gasoline engine 90004, any of a class of internal-combustion engines that generate power by burning a volatile liquid fuel (gasoline or a gasoline mixture such as ethanol) with ignition initiated by an electric spark. Gasoline engines can be built to meet the requirements of practically any conceivable power-plant application, the most important being passenger automobiles, small trucks and buses, general aviation aircraft, outboard and small inboard marine units, moderate-sized stationary pumping, lighting plants, machine tools, and power tools.Four-stroke gasoline engines power the vast majority of automobiles, light trucks, medium-to-large motorcycles, and lawn mowers. Two-stroke gasoline engines are less common, but they are used for small outboard marine engines and in many handheld landscaping tools such as chain saws, hedge trimmers, and leaf blowers. 90005 Cross section of a V-type engine. 90006 Encyclopædia Britannica, Inc. 90007 90008 Engine types 90009 90002 Gasoline engines can be grouped into a number of types depending on several criteria, including their application, method of fuel management, ignition, piston-and-cylinder or rotor arrangement, strokes per cycle, cooling system, and valve type and location.In this section they are described within the context of two basic engine types: piston-and-cylinder engines and rotary engines. In a piston-and-cylinder engine the pressure produced by combustion of gasoline creates a force on the head of a piston that moves the length of the cylinder in a reciprocating, or back-and-forth, motion. This force drives the piston away from the head of the cylinder and performs work. The rotary engine, also called the Wankel engine, does not have conventional cylinders fitted with reciprocating pistons.Instead, the gas pressure acts on the surfaces of a rotor, causing the rotor to turn and thus perform work. 90005 90003 gasoline engines 90004 Gasoline engine types include (A) opposed-piston engines, (B) Wankel rotary engines, (C) in-line engines, and (D) V-8 engines. 90006 Encyclopædia Britannica, Inc. 90007 90002 Most gasoline engines are of the reciprocating piston-and-cylinder type. The essential components of the piston-and-cylinder engine are shown in the figure. Almost all engines of this type follow either the four-stroke cycle or the two-stroke cycle.90005 Typical piston-cylinder arrangement of a gasoline engine. 90006 Encyclopædia Britannica, Inc. 90007 90008 Four-stroke cycle 90009 90002 Of the different techniques for recovering the power from the combustion process, the most important so far has been the four-stroke cycle, a conception first developed in the late 19th century. The four-stroke cycle is illustrated in the figure. With the inlet valve open, the piston first descends on the intake stroke. An ignitable mixture of gasoline vapour and air is drawn into the cylinder by the partial vacuum thus created.The mixture is compressed as the piston ascends on the compression stroke with both valves closed. As the end of the stroke is approached, the charge is ignited by an electric spark. The power stroke follows, with both valves still closed and the gas pressure, due to the expansion of the burned gas, pressing on the piston head or crown. During the exhaust stroke the ascending piston forces the spent products of combustion through the open exhaust valve. The cycle then repeats itself. Each cycle thus requires four strokes of the piston-intake, compression, power, and exhaust-and two revolutions of the crankshaft.90005 90003 internal-combustion engine: four-stroke cycle 90004 An internal-combustion engine goes through four strokes: intake, compression, combustion (power), and exhaust. As the piston moves during each stroke, it turns the crankshaft. 90006 Encyclopædia Britannica, Inc. 90007 Get exclusive access to content from our тисяча сімсот шістьдесят вісім First Edition with your subscription. Subscribe today 90002 A disadvantage of the four-stroke cycle is that only half as many power strokes are completed as in the two-stroke cycle (90029 see below 90030) and only half as much power can be expected from an engine of a given size at a given operating speed.The four-stroke cycle, however, provides more positive clearing out of exhaust gases (scavenging) and reloading of the cylinders, reducing the loss of fresh charge to the exhaust. 90005 .