Katerina Swanson
Gasoline, or petrol, is one of the most energy-rich fuel sources available. It is a transparent liquid derived from the fractional distillation of petroleum. It is used in spark-ignited internal combustion engines, which are ignited by sparks from a spark plug rather than compression. The fuel is injected into the tank, then pumped into the fuel line, where it goes through a fuel filter to prevent clogging. It then travels through the fuel pump and fuel line to the engine's fuel injection system, where it is combined with air and ignited. The exhaust gases are then channelled out through the exhaust system.
| Characteristics | Values |
|---|---|
| Purpose | To fuel the engine and allow the vehicle to operate |
| Fuel System | Moves gas from the gas tank, through the fuel lines, and up to the fuel injectors to help with combustion |
| Combustion | Occurs when the fuel in your engine is sparked by spark plugs |
| Spark Plugs | Create a spark to light the fuel and push the pistons down |
| Fuel Injectors | Inject fuel into the combustion chamber |
| Fuel Filter | Removes dirt or debris from the fuel |
| Fuel Pump | Transfers fuel from the tank to the engine |
| Fuel Tank | Stores gasoline until it's needed by the engine |
| Fuel Filler | A nozzle from a fuel dispenser attaches to the receptacle on the vehicle to fill the tank |
| Exhaust System | Channels exhaust gases from the engine out through the tailpipe |
| Octane Ratings | 87, 89, and 91 (higher ratings are more resistant to combustion) |
| Energy Density | 40 megajoules per kilogram |
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What You'll Learn
Spark plugs ignite fuel
Spark plugs are an essential component of the combustion process in a car's engine. They are responsible for igniting the fuel-air mixture within the combustion chamber, creating the spark that triggers the combustion process and propels the vehicle forward.
The spark plug is connected to the high voltage generated by an ignition coil or magneto. As the current flows from the coil, a voltage develops between the central and side electrodes, creating a spark gap. This gap is crucial to the proper functioning of the engine. If the gap is too narrow, the spark may be too weak to ignite the fuel-air mixture effectively. On the other hand, if the gap is too wide, the spark may not fire at all or may misfire at high speeds.
The spark plug's metal shell is screwed into the engine's cylinder head and is electrically grounded. The central electrode protrudes through the porcelain insulator into the combustion chamber, forming one or more spark gaps. The primary function of the spark plug is to ignite the fuel-air mixture within this chamber under any operating condition. The spark plug must provide a path and a location for the electrical energy from the ignition coil to create a spark and ignite the mixture.
The spark plug firing end temperature must be carefully regulated to prevent pre-ignition and fouling. Pre-ignition occurs when the air-fuel mixture is ignited by a hot object or area in the combustion chamber before the timed spark event. This can lead to overheating, causing the electrodes to wear quickly and potentially damaging the spark plug and/or the engine. Regular maintenance and inspections of the spark plugs are crucial to ensure optimal performance and prevent engine damage.
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Fuel injection systems
The two main functional principles of mixture formation systems for internal combustion engines are internal and external. External mixture formation, also known as a manifold injection system, can be further categorized into multi-point (or port) and single-point (or throttle body) injection. Multi-point injection, or port injection, involves injecting fuel into the intake ports near each cylinder's intake valve, rather than at a central point. This system typically employs multiple fuel injectors, but some configurations use tubes with poppet valves supplied by a central injector. Single-point injection, on the other hand, utilizes a single injector in the throttle body, similar to a carburetor setup. This system was widely used in American-made passenger cars and light trucks during the 1980s and 1990s, and it offered a cost-effective way to reduce exhaust emissions while improving engine performance. However, it is now considered outdated and below eco-standards due to its reliability issues.
Internal mixture formation systems encompass various types of direct and indirect injection methods. The most common internal mixture formation system is the common-rail injection, a variety of direct injection. Direct injection systems spray fuel into the air inside the cylinder or combustion chamber, and they can be implemented using a conventional helix-controlled injection pump, unit injectors, or a common-rail injection system. The common-rail injection system is the most prevalent in modern automotive engines, where fuel is supplied to an accumulator and then directed through tubing to the injectors, which inject it into the combustion chambers. This system includes a high-pressure relief valve to maintain pressure and return excess fuel to the tank.
In the past, carburetors were used to create the optimal mix of air and fuel for combustion, relying on the engine's suction to draw in air. However, carburetors struggled with fluctuating RPMs, leading to poorer fuel economy and smoother performance. The introduction of fuel injection systems, initially mechanical and later electronic, improved fuel efficiency and engine performance by directly injecting fuel into the combustion chamber through small nozzles under high pressure. Electronic fuel injection, controlled by the Electronic Control Unit (ECU), is now the standard in most vehicles, offering improved precision, fuel efficiency, and overall performance.
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Fuel filters
The fuel filter is an important component of a car's fuel system. It acts as a barrier to trap and remove impurities, sediment, contaminants, dirt, rust and other particles from the fuel before it reaches the engine. This ensures that the fuel entering the engine is clean and uncontaminated, which is essential for the engine's proper functioning and longevity.
The fuel filter is designed to be permeable, allowing fuel to pass through while trapping impurities in its screen or filtering material. The filtering material can be made of paper or other suitable substances. Over time, the fuel filter can become clogged with the impurities it captures, leading to reduced fuel flow and potential engine problems. Therefore, regular replacement of the fuel filter is necessary to maintain optimal fuel efficiency and engine performance.
The recommended interval for replacing the fuel filter depends on the age of the vehicle, the manufacturer's guidelines, and the type of driving conditions. For older vehicles, the suggested interval can range from 20,000 to 70,000 miles, while some newer models with advanced fuel systems may have fuel filters designed to last the vehicle's lifetime. However, for vehicles subjected to heavy-duty towing or off-road driving in dusty and dirty environments, it is advisable to replace the fuel filter more frequently to ensure the engine receives clean fuel.
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Octane ratings
Octane is a gasoline additive that is required for the proper functioning of modern engines. Octane sources have historically taken many forms, 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.
The octane rating is a measure of a fuel’s ability to avoid 'knock'. Knock occurs when fuel is prematurely ignited in the engine’s cylinder, which degrades efficiency and can be damaging to the engine. Knock is virtually unknown to modern drivers as fuels now contain an oxygenate that prevents knock by adding oxygen to the fuel. The higher the octane number, the more stable the fuel and the more resistant the gasoline mixture is to knock. The use of higher octane fuels also enables higher compression ratios, turbocharging, and downsizing/downspeeding—all of which enable greater engine efficiencies and higher performance.
At most retail gasoline stations, three octane grades are offered: 87 (regular), 89 (mid-grade), and 91-93 (premium). The higher the octane number, the more resistant the fuel is to spontaneously combusting under pressure. This is important for high-performance, high-pressure engines. In recent years, car manufacturers have been requiring or recommending premium gasoline (a high-octane grade of fuel) for more of their vehicle models. The difference in prices between premium and lower octane grades has also increased.
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Diesel vs gasoline
Both gasoline and diesel engines use internal combustion. In this process, air enters the engine and combines with fuel. The engine's cylinders compress the resulting mixture, which ignites to trigger the motion of the piston and crankshaft. The crankshaft then activates the vehicle's transmission to turn the wheels of the car.
However, the ignition process varies for gas and diesel engines. Gasoline engines use spark plugs to ignite the compressed air-fuel mixture within each cylinder. This design requires a more complex ignition system, including components like the distributor, ignition coils, and spark plugs. On the other hand, diesel engines do not have spark plugs. Instead, they use extreme compression to generate the heat required for spontaneous ignition, also known as compression ignition. Their components, including the engine block, pistons, and cylinder heads, are built to withstand the high pressures and stresses needed to operate.
In terms of efficiency, diesel engines are more fuel-efficient compared to gasoline engines due to their higher energy density. Diesel fuel packs more energy in every gallon than gas fuel, making it more economical overall. This creates greater mileage per gallon of fuel, making diesel engines particularly beneficial for heavy-duty or long-distance driving. Additionally, diesel engines tend to operate more efficiently at lower RPMs and under various load conditions. However, gasoline engines are more capable of achieving higher RPMs and offer quicker acceleration compared to diesel engines.
When it comes to cost, diesel fuel tends to be more expensive than gasoline due to taxation and demand. In the United States, federal and state taxes on diesel fuel are often higher than on gasoline because of its use in commercial trucks. However, the price difference between diesel and gasoline can vary depending on location and local regulations. While diesel fuel may cost less per mile driven, the upfront cost of a diesel vehicle is typically higher than that of a gas-powered vehicle. As a result, it can take many years to break even when considering the cost of a diesel vehicle versus the fuel savings.
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Frequently asked questions
Gasoline, also known as petrol, is a transparent liquid fuel that powers cars. It is one of the most energy-rich substances on Earth.
Gasoline is injected into the tank, then brought into the fuel line by the pump. It goes through a fuel filter to prevent clogging by removing waste, before being delivered into pistons by fuel injectors. The fuel injectors combine air with fuel, and the mixture is then ignited by a spark plug. The exhaust gases are then channelled out through the tailpipe.
Alternative fuels include LPG, CNG, bio-diesel, ethanol, and methanol. Electric cars are also an alternative option.
