Rajan Wilcox
NASCAR, the National Association for Stock Car Racing, has been a staple of the American motor racing scene since its first race in 1948. With races held across the US and Canada, NASCAR boasts some of the fastest cars in racing, with average speeds of up to 150-200 miles per hour. To achieve these speeds, NASCAR vehicles require a fuel delivery system that can keep up with the demands of high-performance driving. The fuel delivery system in NASCAR cars has evolved over time, transitioning from carbureted engines to fuel injection systems, with a focus on safety, performance, and environmental considerations.
| Characteristics | Values |
|---|---|
| Fuel Type | Sunoco Green E15, a 98 octane, unleaded fuel blend with 15% ethanol |
| Fuel Delivery System | Fuel injection, replacing carburetors since 2012 |
| Fuel Efficiency | More efficient than predecessors, with over 150 adjustments possible |
| Horsepower | Higher horsepower than predecessors |
| Safety | Safer for drivers, spectators, and the environment |
| Fuel Cell | Consists of a fuel bladder, interior foam, and a metal container |
| Fuel Lines and Pumps | Tightly regulated by NASCAR, with high-pressure pumps near the fuel rail |
| Fuel Return | Direct return to the tank |
| Fuel Pressure | Regulated to ensure proper fuel atomization |
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Fuel injection
The fuel injection system in NASCAR racing cars has been jointly developed by McLaren Electronic Systems and Freescale Semiconductor. It allows for more than 150 different adjustments to be made by crew chiefs, compared to only 24 adjustments possible with carburetors. This technology also enables NASCAR to move towards the use of alternative fuels, such as Sunoco's Green E15 fuel mixture, which is a blend of ethanol and gasoline.
One downside of allowing 15% ethanol fuel is the impact on corn prices, as ethanol production requires a large amount of corn. NASCAR has considered alternative sources of ethanol, such as bamboo-based ethanol or compressed natural gas, but the high cost of ethanol production due to the 2012 North American drought has made this challenging.
The transition to fuel injection in NASCAR racing cars has also had an impact on engine development and reliability. With the increased cost and complexity of engine development, there are now only a handful of engine suppliers for NASCAR teams. This has led to concerns about the competitiveness of teams that cannot afford to work with the major engine suppliers. However, the use of fuel injection is expected to pay off in the long run with fewer blown engines and lower ongoing engine costs.
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Fuel efficiency
The fuel injection system in NASCAR vehicles allows for precise fuel delivery, ensuring that the amount of fuel injected suits the airflow through the engine. This not only improves efficiency but also contributes to regulating horsepower, making the sport safer. With over 150 adjustments possible through fuel injection, compared to only 24 with carburetors, NASCAR crews have a much finer level of control over engine performance and fuel optimisation.
The fuel used in NASCAR also plays a crucial role in efficiency. NASCAR currently utilises Sunoco Green E15, a 98-octane unleaded fuel blend specifically engineered for high-performance engines. This fuel blend contains 15% American-made corn-based ethanol, which burns cleaner than conventional gasoline. The use of ethanol fuel contributes to a reduction in emissions, making the environment cleaner for both spectators and racers. Additionally, the fuel blend includes additives designed to keep fuel systems clean and efficient by reducing deposits.
The design of the fuel delivery system in NASCAR cars is carefully considered to optimise efficiency. The high-pressure fuel pump is positioned close to the fuel rail, enabling a quicker throttle response. This strategic placement ensures that the engine receives fuel promptly, enhancing performance and efficiency. NASCAR rules tightly regulate the fuel lines, fuel pumps, their mounting methods, and connections, ensuring safety and consistency across the sport.
Safety is also a key consideration in NASCAR's fuel efficiency journey. The tragic death of Fireball Roberts in 1964 highlighted the importance of fire prevention and minimisation. Today, NASCAR mandates the use of fuel cells that consist of a fuel bladder, interior foam, and a metal container. These safety measures help prevent and contain fires, protecting drivers and crews. NASCAR's commitment to safety and efficiency is evident in the ongoing evolution of fuel delivery systems and the choice of specialised fuels.
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Fuel safety
One of the key safety features of NASCAR's fuel delivery system is the use of fuel cells. Fuel cells play a crucial role in preventing and minimising fires, a significant concern in racing. Modern NASCAR fuel cells consist of multiple components, including a fuel bladder, interior foam, and a metal container that meets NASCAR's stringent standards. These fuel cells are designed to contain and control the fuel, reducing the risk of leaks and spills, which could lead to fires or environmental hazards.
The fuel itself is also a critical aspect of fuel safety. NASCAR vehicles use specialised fuel blends, such as Sunoco Green E15, a 98-octane unleaded fuel blend containing 15% ethanol. This fuel is designed specifically for high-performance engines and race cars, providing additional horsepower while reducing emissions. The use of ethanol contributes to cleaner burning fuel when compared to conventional gasoline, improving the environment for spectators and competitors.
Another safety consideration in NASCAR's fuel delivery system is the regulation of fuel pressure and flow. Maintaining proper fuel pressure is essential for engine performance and safety. NASCAR closely regulates fuel pumps, their mounting methods, and connections to ensure optimal fuel delivery and reduce the risk of fuel-related incidents. The precise control of fuel injection allows for a more accurate amount of fuel to suit the airflow through the engine, enhancing efficiency and horsepower regulation.
Additionally, NASCAR has implemented measures to protect drivers in the event of a fire. This includes the development and mandatory use of fire-protective clothing, a significant improvement from the early days when drivers raced in T-shirts and blue jeans. NASCAR's rule book underscores the importance of fuel safety, with strict regulations governing fuel cells, fuel lines, and fuel pumps to minimise the risk of fires and ensure the safety of all involved.
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Fuel cell technology
NASCAR racing cars have come a long way since the early days of the sport when drivers raced in T-shirts and jeans, and safety standards were non-existent. Fuel cell technology has been an important part of the evolution of NASCAR racing cars, with the fuel cell becoming integral to the race car after the tragic death of Fireball Roberts from burns following a fire during a race in 1964.
Today, NASCAR fuel cells consist of a fuel bladder, interior foam, and a metal container that meets NASCAR's strict standards. The fuel lines, fuel pumps, their methods of mounting, and their connections are also tightly regulated by NASCAR. There are three manufacturers that supply fuel cells to NASCAR: Fuel Safe, Autosport Innovations, and ATL Fuel Cells.
The fuel delivery system in NASCAR racing cars has also seen significant changes over the years. Initially, NASCAR cars were carburetor-powered, but in 2012, NASCAR transitioned to fuel injection, which had become standard in vehicles outside of the racing circuit. This change brought about new challenges and opportunities for adjustment, with over 150 different adjustments possible with fuel injection compared to only 24 with a carburetor.
The fuel injection system used in NASCAR is jointly developed by McLaren Electronic Systems and Freescale Semiconductor. It allows for a precise amount of fuel to be delivered, suiting the amount of airflow through the engine and resulting in increased efficiency and safety. The fuel used in NASCAR racing cars is Sunoco Green E15, a 98-octane unleaded fuel blend specifically designed for race cars and high-performance vehicles. It contains 15% American-made corn-based ethanol, which burns cleaner than conventional gasoline and provides additional horsepower.
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Fuel type
NASCAR cars have used a variety of fuels over the years, with the choice of fuel being a crucial aspect of a racecar's engine performance.
Leaded Gasoline
NASCAR vehicles previously used leaded gasoline, also known as petrol, which contains small amounts of tetraethyllead. This fuel was once common in the automotive industry but has since been phased out due to environmental and health concerns. Leaded gasoline has a higher octane rating than unleaded gasoline, making it more suitable for high-performance engines.
Ethanol Fuel
In recent years, NASCAR has transitioned to using ethanol fuel, specifically the E15 blend. This fuel is a mixture of 15% ethanol and 85% gasoline. The 2012 North American drought made ethanol production expensive, but NASCAR continued to use it. This blend is considered more environmentally friendly and has been supplied by Sunoco, the official fuel partner of NASCAR for nearly two decades. Sunoco's Green E15 fuel mixture is used in the NASCAR Sprint Cup Series, contributing to more efficient vehicles and a cleaner environment for spectators.
Methanol Fuel
Methanol, or methyl alcohol, was previously used in some open-wheel race cars, such as the IndyCar Series before 2007. However, it is not as commonly used today due to safety concerns. Methanol is highly toxic and can be dangerous in the event of a spill or leak.
Nitrous
Nitrous oxide is used in drag racing vehicles to boost horsepower and increase engine performance. However, it is not commonly used in NASCAR racing.
Future Alternatives
NASCAR may consider alternative fuels in the future. Suggested options include bamboo-based ethanol, E85 ethanol derived from surplus corn, or even compressed natural gas. These alternatives could provide sustainable options for the racing industry, reducing the environmental impact of motorsports.
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Frequently asked questions
NASCAR racing cars use a fuel injection system.
NASCAR started using fuel injection in 2012, replacing carburetors after 55 years.
NASCAR racing cars use Sunoco Green E15, a 98-octane unleaded fuel blend specifically designed for race cars and high-performance vehicles.
Fuel injection allows for a more precise amount of fuel to be delivered to the engine, making the cars more efficient and safer. It also provides more adjustability and helps to reduce emissions.
The fuel injection system in NASCAR racing cars uses a high-pressure pump located near the fuel rail to deliver fuel to the injectors. This allows for a quicker throttle response, which is crucial in racing.
