Katerina Swanson
Octane is a gasoline additive that is needed for the proper functioning of modern engines. Octane sources have taken many forms throughout the years, both renewable and petroleum-based. Octane ratings are measures of fuel stability, with higher octane numbers indicating more stable fuel. In recent years, car manufacturers have been recommending premium gasoline (a high-octane grade of fuel) for more vehicle models. Higher-octane fuel can improve engine performance and fuel economy, and reduce carbon dioxide emissions.
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What You'll Learn
Octane boosters
The use of octane boosters can be traced back to the transition from leaded to unleaded gasoline in the 1980s and 1990s. Leaded gasoline, which was commonly used to increase the octane rating of fuel, was phased out due to its harmful health and environmental impacts. This transition led to the development and use of alternative octane sources, such as ethanol and other petroleum-based products.
Octane ratings are a measure of fuel stability and indicate the pressure at which a fuel will spontaneously combust (auto-ignite) in an engine. The higher the octane rating, the more stable the fuel and the higher the resistance to auto-ignition. Engines are designed to burn fuel in a controlled combustion process, but spontaneous combustion can occur when the temperature and pressure rise, causing unburned fuel to ignite prematurely. This phenomenon is known as "knocking" or "detonation".
Different countries have different standard gasoline grades, with some offering higher octane options for vehicles that require them. For example, in Finland, most cars use 95 RON gasoline, but 98 RON is available for vehicles that need higher octane fuel or older models with components sensitive to high ethanol content. Similarly, in the United States, some states offer ethanol-based E-85 fuel with higher octane ratings, and filling stations near racing tracks may provide even higher octane options.
The use of octane boosters can be beneficial in certain situations, such as when an engine is designed to run on high-octane fuel or when an increase in engine performance is desired. However, it is important to consult a professional or refer to the vehicle's user manual before using octane boosters, as using fuel with an octane rating higher than what is recommended for a particular engine may not provide any additional benefits and could potentially cause issues.
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Octane ratings
Octane is a gasoline additive that is required for the proper functioning of modern engines. Octane sources have taken many forms throughout the years, including lead, methyl tertiary butyl ether (MTBE), benzene, toluene, ethyl-benzene, xylene (BTEX), and ethanol (a biofuel).
There are two primary methods for determining the octane rating of a fuel: the Research Octane Number (RON) and the Motor Octane Number (MON). The RON is determined by testing the fuel under engine idle conditions with a low air temperature and slow engine speed, while the MON is tested under more stressful conditions of higher air temperature and engine speed. The octane rating of a fuel is the simple average of these two methods.
Higher-octane fuels are often required or recommended for engines that use a higher compression ratio and/or use supercharging or turbocharging to force more air into the engine. Using a lower octane fuel than required can cause the engine to run poorly and can damage the engine and emissions control system over time. It may also void your warranty. In older vehicles, the engine can make an audible "knocking" or "pinging" sound. Many newer vehicles can adjust the spark timing to reduce knock, but engine power and fuel economy will still suffer.
In recent years, car manufacturers have been requiring or recommending premium gasoline (a high-octane grade of fuel) for use in more of their vehicle models. The difference in prices between premium and lower octane grades has also increased. However, the use of higher-octane fuel can improve performance and fuel economy, as well as reduce carbon dioxide (CO2) emissions.
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Octane sources
Today, the two primary sources of octane used in the U.S. gasoline supply are the BTEX complex (a petroleum refining product commonly referred to as gasoline aromatics) and ethanol. Ethanol has a higher octane rating than regular gas, and it is a cleaner-burning alternative to petroleum-based octane boosters. However, ethanol has a higher volatility than gasoline, and it produces less energy.
Primary Reference Fuels (PRF) of precisely known octane are formed by combining iso-octane, heptane, and other well-known standards such as toluene. These PRFs are used to determine the pressure at which a fuel will spontaneously combust. The standard method for testing octane is with an octane testing engine, which compares the performance of a fuel sample to reference fuels with known octane ratings.
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Octane and engine performance
Octane is an important aspect of engine performance and is one of the most commonly discussed and marketed properties of performance fuels. Octane is a gasoline additive that is necessary for the proper functioning of modern engines. It is a measure of a fuel's stability and its burning behaviour, specifically, its likelihood of combusting predictably when pressurized during an engine's compression stroke. The higher the octane rating, the more stable and predictable the combustion.
The octane rating of aviation gasoline was extremely important in determining aero-engine performance in the aircraft of World War II. The higher octane fuel allowed a wider range of operating conditions. In modern engines, the octane rating is important as it determines how the engine will perform and whether it will knock or pre-ignite. Knocking occurs when the combustion of the air-fuel mixture in the cylinder does not result from the spark plug but when pockets of the mixture explode outside the envelope of the normal combustion front. This can cause power loss and heat buildup.
The octane number is the average of two different octane rating methods: the motor octane rating (MOR) and the research octane rating (RON). The difference between RON and MON is known as the fuel's sensitivity. The standard way of testing octane is with an octane testing engine, which involves placing a given fuel sample in an octane engine and adjusting the cylinder height to change the compression ratio/pressure until knocking reaches a specific intensity.
In recent years, car manufacturers have been recommending premium gasoline (a high-octane grade of fuel) for use in more of their vehicle models. However, it is important to note that the performance gains from higher octane fuel are not infinite. The engine's performance depends on its design and whether it has been optimized for low or high octane fuel. For example, aircraft engines run best on lower-octane, slower-burning fuels that require less heat and a lower compression ratio.
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Octane and emissions
Octane is a gasoline additive that is needed for the proper functioning of modern engines. Octane sources have taken many forms throughout the years, both renewable and petroleum-based. They include lead, methyl tertiary butyl ether (MTBE), benzene, toluene, ethyl-benzene and xylene (BTEX), and ethanol (a biofuel).
As adverse health and environmental consequences have been discovered for lead and petroleum-based octane providers, they have been removed from the fuel supply or decreased. Today, there are two primary sources of octane used in the US gasoline supply: the BTEX complex (a petroleum refining product commonly referred to as gasoline aromatics) and ethanol. Aromatic hydrocarbons such as benzene and toluene may raise octane, but they worsen air pollution and are highly toxic, which is why the use of certain aromatics is strictly limited by the US Environmental Protection Agency (EPA).
Ethanol is a cleaner-burning alternative to petroleum-based octane boosters. Its toxicity is low compared to the health effects of BTEX and its combustion products, such as ultrafine particulates (UFPs) and polycyclic aromatic hydrocarbons (PAHs). A modest increase in ethanol content in fuel from 10 to 15 percent would result in an anticipated 6.6 percent reduction in cancer risk from tailpipe emissions. However, there is contradictory evidence that increasing ethanol content in gasoline increases nitrous oxide (NOX) emissions, an ozone precursor. Several studies find either no relationship between ethanol blending and NOX emissions or find decreased NOX emissions with increasing ethanol volumes. Other studies suggest older cars emit more NOX when using ethanol blends.
Octane ratings are measures of fuel stability. These ratings are based on the pressure at which a fuel will spontaneously combust (auto-ignite) in a testing engine. The octane number is the simple average of two different octane rating methods—motor octane rating (MOR) and research octane rating (RON)—that differ primarily in the specifics of the operating conditions. The higher an octane number, the more stable the fuel.
In recent years, car manufacturers have been requiring or recommending premium gasoline (a high-octane grade of fuel) for use in more of their vehicle models. The difference in prices between premium and lower octane grades has also increased.
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Frequently asked questions
Octane is a gasoline additive that is needed for the proper functioning of modern engines. Octane sources have taken many forms throughout the years, both renewable and petroleum-based.
Octane ratings are measures of fuel stability. The higher the octane number, the more stable the fuel. Retail gas stations in the United States sell three main grades of gasoline based on the octane level.
Using a lower octane fuel than required can cause the engine to run poorly and can damage the engine and emissions control system over time. It may also void your warranty.
Using higher-octane fuel can improve performance and fuel economy. It can also reduce carbon dioxide (CO2) emissions by a few percent during severe duty operation.
