Katerina Swanson
Diesel fuel is made using a hydrocarbon mixture that is a byproduct of the distillation of crude oil. It is denser than gas and has a higher boiling point than water, which means it has an extremely low evaporation point. Diesel engines ignite fuel without the need for an electric spark, as the fuel and air are squeezed so tightly that the mixture self-ignites. Diesel engines are more efficient than petrol engines because of their greater compression, allowing them to make better use of the heat generated. However, diesel fuel has been found to produce more greenhouse emissions. Leaded gasoline has been phased out in many countries due to health and environmental concerns, and diesel fuel does not require lead additives for combustion.
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What You'll Learn
- Leaded petrol is a health hazard and has been phased out in the US and most other countries
- Diesel engines ignite fuel without a spark, unlike petrol engines
- Diesel has a higher boiling point than water and a low evaporation point
- Diesel engines are more efficient than petrol engines
- Biodiesel is a safe, biodegradable alternative to diesel and petrol
Leaded petrol is a health hazard and has been phased out in the US and most other countries
Leaded petrol is a mixture of petrol and lead, also known as tetraethyllead (TEL). Lead was added to petrol to improve engine performance, but it is a dangerous substance that can cause lead poisoning. Lead poisoning can cause acute toxic psychosis, low IQ, and antisocial behaviours.
TEL is highly soluble in petrol, which means it can be easily absorbed by body fats and lipids and can cross the blood-brain barrier. There is no cure for direct poisoning by TEL. As such, leaded petrol poses a significant threat to human health.
In recognition of the health risks posed by leaded petrol, most high-income countries had prohibited its use by the 1980s. The first country to completely ban leaded gasoline was Japan in 1986. The use of catalytic converters in the United States from 1975 onwards also started a gradual phase-out of leaded gasoline in the US. Since 1993, all gasoline-powered cars sold in the European Union and the United Kingdom have been required to use unleaded fuel.
The phase-out of leaded petrol was also driven by environmental concerns, as leaded petrol contaminated air, dust, soil, drinking water, and food crops. The end of leaded petrol is expected to support the realization of multiple Sustainable Development Goals, including good health and well-being, clean water, and clean energy.
In 2002, the UN Environment Programme (UNEP) began its campaign to eliminate lead in petrol, and in 2021, the use of leaded petrol ended globally when service stations in Algeria stopped providing it. This marked the end of a two-decade-long campaign by the UNEP-led global Partnership for Clean Fuels and Vehicles (PCFV).
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Diesel engines ignite fuel without a spark, unlike petrol engines
Diesel engines and petrol engines have fundamental differences in their mechanisms, particularly in how they ignite fuel. Unlike petrol engines, diesel engines do not require a spark to ignite their fuel. Instead, diesel engines compress air and fuel so tightly that the mixture self-ignites without the need for an electric spark. This is why diesel engines are also known as compression-ignition engines (CI engines).
The diesel engine, named after Rudolf Diesel, is an internal combustion engine. It uses highly compressed hot air to ignite the fuel, unlike spark plug-ignition engines like petrol engines, which use a spark plug to ignite the air-fuel mixture. In a diesel engine, only air is initially introduced into the combustion chamber. The air is then compressed with a high compression ratio, typically between 15:1 and 23:1, or even as high as 25:1 in some cases. This compression causes the temperature of the air to rise significantly.
At about the top of the compression stroke, fuel is injected directly into the compressed air in the combustion chamber. This injection occurs either into a void in the top of the piston or a pre-chamber, depending on the engine's design. The vapour is then ignited by the heat from the compressed air, and the droplets continue to vaporise and burn until all the fuel is consumed. This combustion occurs at a constant pressure during the initial part of the power stroke.
The high compression ratio in diesel engines allows for better efficiency. The greater compression ratio, compared to petrol engines, enables diesel engines to make better use of the heat generated. Additionally, diesel fuel has a higher energy density than petrol due to its longer molecular chains. This inherent difference in fuel composition, along with the absence of a spark plug, sets diesel engines apart from petrol engines in terms of both design and functionality.
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Diesel has a higher boiling point than water and a low evaporation point
Diesel fuel has a higher boiling point than water, which means it has a very low evaporation point. This is in contrast to regular gas, which can evaporate at room temperature. Diesel is denser than gas and requires compression and heat to function. It is classified as combustible, meaning it ignites without the need for an electric spark. Diesel engines are designed to withstand high pressure and heat, and the fuel is injected directly into the cylinder.
The chemical composition of diesel is C14H30, and it is made from a hydrocarbon mixture that is a byproduct of the distillation of crude oil. The extra atoms in diesel's composition make a significant difference during combustion, resulting in more greenhouse emissions. However, diesel produces several times more power than regular gas, making it more efficient.
Regular unleaded gas, on the other hand, is considered a flammable liquid that requires a spark to ignite. It contains more sulfur than diesel, which serves a similar function to lead in making the gas burn better. While diesel is less effective in automobiles, it is highly efficient for use in trucks and heavy machinery, especially at higher altitudes.
The difference in engine design between diesel and regular gas engines is also notable. Diesel engines operate through direct fuel injection and can withstand higher pressure and heat. They may also have a glow plug to enhance combustion in cold weather. Regular gas engines, on the other hand, require less pressure and heat due to the use of spark plugs for ignition.
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Diesel engines are more efficient than petrol engines
Diesel engines are widely recognised for their fuel efficiency, offering 30-35% better fuel economy compared to petrol engines. They are particularly suited to motorway use and are more fuel-efficient at higher speeds. This is due to their higher compression ratio and more efficient combustion process, which enhances their fuel economy.
Diesel engines have a longer stroke, allowing more time for the piston to move away from the heat, thereby lengthening the engine's lifespan and building up power. This also results in less carbon build-up, giving the engine more power and making it longer-lasting.
Diesel fuel is denser than petrol and has a higher boiling point than water, meaning it has an extremely low evaporation point. It is made from crude oil and has longer molecular chains, which contain more energy per litre. This means that diesel packs more energy into every gallon, making it more economical overall.
Diesel engines are also more durable and require less maintenance. They are ideal for heavy-duty tasks and long-distance hauling, as they have higher torque and produce more power for pulling heavy loads.
However, it is important to note that some types of diesel fuel can negatively impact vehicle performance, and diesel engines might burn more fuel in stop-and-go traffic in city driving conditions.
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Biodiesel is a safe, biodegradable alternative to diesel and petrol
Diesel engines and petrol engines are designed differently because they ignite their fuel in different ways. Diesel engines are more efficient because of their greater compression, which allows them to make better use of the heat generated. Diesel fuel is denser than gas and has a higher boiling point than water, which means it has an extremely low evaporation point.
Diesel fuel is highly efficient for use within trucks and heavy machinery, but it is less effective in automobiles. It is also known to perform better at higher altitudes. Diesel fuel is classified as combustible, requiring compression and heat to function.
Biodiesel is a renewable, biodegradable alternative fuel made from a mix of modified vegetable oils, recycled cooking oils, algae, and animal fats. It is also produced from yellow grease (used restaurant oil from cooking) and animal tallow. Biodiesel blends improve fuel lubricity and increase the cetane number, leading to fewer ignition delays and smoother engine starts.
Biodiesel is considered a cleaner alternative to traditional petroleum-based diesel. It is advertised as the energy source of the future because it is safe, non-toxic, and less polluting. It reduces tailpipe emissions, including the amount of soot and "air toxics" released into the atmosphere. Biodiesel emits 11% less carbon monoxide and 10% less particulate matter than diesel. It also contains more oxygen and tends to burn more fully, reducing the number of emissions.
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Frequently asked questions
Diesel fuel is a hydrocarbon mixture that is a byproduct of the distillation of crude oil. It has a higher boiling point than water, giving it an extremely low evaporation point. Diesel engines ignite fuel without the need for an electric spark, instead using compression and heat.
Leaded fuel is fuel that contains lead. Leaded gasoline has been phased out in many countries due to health and environmental concerns.
No, diesel fuel does not contain lead.
Lead was added to fuel to make it burn better.
