Ameer Randolph
Top Fuel dragsters and funny cars are the quickest accelerating racing cars in the world, with the fastest competitors reaching speeds of 338.94 miles per hour. These cars are powered by nitromethane, which costs about $30 per gallon. In a single run, these cars can burn through roughly 15 gallons of fuel. The amount of fuel used depends on several factors, including the length of the run, the speed of the car, and the engine configuration.
| Characteristics | Values |
|---|---|
| Gallons of fuel used in a single run | 10-15 gallons |
| Gallons of fuel used during a quarter-mile run | 4-5 gallons |
| Fuel used for a complete pass | 10-12 gallons |
| Fuel used during warmup, burnout, staging, and the quarter-mile run | 12-22.75 gallons |
| Fuel flow rate | 8 gallons per minute (64 gallons per minute for all eight cylinders) |
| Fuel flow rate for Top Fuelrs | 88-94 gallons per minute |
| Fuel line pressure | 400-500 pounds |
| Fuel cost | $30 per gallon |
| Horsepower | 7,000 horsepower |
| Acceleration | 0-100 mph in less than 1 second |
| Top speed | 326-338.94 mph |
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What You'll Learn
Fuel consumption for a quarter-mile run
The NHRA Top Fuel dragsters and Funny Cars are the quickest accelerating racing cars in the world. They can go from 0 to 100 mph in less than 0.8 seconds and can exceed 280 mph in just 660 feet. They are powered by nitromethane, which costs about $30 per gallon.
The fuel consumption of these cars for a quarter-mile run varies depending on the source. Some sources claim that they use between 10 and 12 gallons of fuel for a complete pass, which includes the burnout, backup to the starting line, and the quarter-mile run. This equates to between 4 and 5 gallons of fuel for just the quarter-mile run. This is equivalent to between 16 and 20 gallons per mile.
Other sources claim that a Top Fuel dragster engine consumes 1.5 gallons of nitromethane per second under full throttle. Considering that the quarter-mile run takes between 4.4 and 4.5 seconds, this would result in a fuel consumption of 6.75 gallons for the quarter-mile run.
It's important to note that the distance for Top Fuel races has been shortened from the traditional quarter-mile (1,320 feet) to 1,000 feet due to safety concerns. This change was introduced in 2008 by the National Hot Rod Association after the fatal crash of a Funny Car driver. Therefore, the fuel consumption for the shortened distance may differ from the quarter-mile fuel consumption.
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Cost of nitromethane fuel
The nitromethane used to power the engines of NHRA Top Fuel dragsters and Funny Cars costs about $30 per gallon. NHRA teams pay $1800 for a 40-gallon drum of nitromethane, which equates to $45 per gallon. This is a group discount negotiated for the entire racing season.
Every single run consumes 14 gallons of fuel to run wide-open throttle for 1000 feet, costing about $630 in fuel costs for every single run—closer to $600 because 10% of the fuel is alcohol, which is less expensive. Factoring in costs for fuel, crew mechanics, parts, and transportation, every single run costs an NHRA team about $5000, according to champion racer Matt Hagan.
Nitromethane-based fuel is highly combustible and corrosive. The engines are punished so severely that each engine gets rebuilt before every run. Each crew has several top-notch mechanics who are paid to do this work under strict time constraints according to NHRA rules, often in sweltering heat.
In addition to paying the staff, the teams also haul 18-wheeler trucks full of fresh pistons, heads, connecting rods, exhaust systems, and everything else necessary to be in contention for a championship trophy. With drill presses, sanders, and other equipment, these rigs also function as mobile high-tech garages.
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Fuel-line pressure
NHRA Top Fuel dragsters and Funny Cars have fuel-line pressures between 400 and 500 pounds, which is approximately 20 times greater than the pressure in a typical passenger car's fuel pump. This high-pressure system is necessary to deliver the large volumes of fuel required by these high-performance engines.
The fuel line in a funny car is about 3 inches thick, and the fuel pumps flow at an incredible rate of 90 to 100 gallons per minute. This high flow rate is essential to provide the necessary fuel for the engine, which can burn up to 15 gallons of fuel in a single run. At maximum pull, these engines can consume up to 6,800 rpm, resulting in an extremely high fuel flow rate.
Maintaining the correct fuel-line pressure is crucial for the performance and safety of funny cars. A clogged oil filter, faulty fuel pump, or issues with the fuel pressure regulator can lead to low fuel pressure, affecting the engine's performance and making it challenging to ignite. On the other hand, high fuel pressure can also cause issues, such as poor gas mileage and long-term damage to the vehicle. Therefore, regular maintenance and monitoring of the fuel-line pressure are essential to ensure optimal performance and prevent potential issues.
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Fuel-pump delivery
The fuel delivery system in a Funny Car is a critical component, given the large amounts of fuel consumed by these vehicles. A fuel pump for an NHRA Top Fuel dragster and Funny Car delivers approximately 65 gallons of fuel per minute, which is equivalent to eight bathroom showers running simultaneously. This high flow rate is necessary to keep up with the engine's fuel demands, as a single run can burn around 15 gallons of fuel.
The fuel pump plays a crucial role in delivering the required amount of fuel to the engine. The pump can flow up to 100 US gallons (380 litres) per minute at 7500 rpm and 500 psi (3,450 kPa) of fuel pressure. This high-pressure fuel system ensures that the engine receives a consistent and adequate supply of fuel, even at high speeds and under intense acceleration.
The fuel line pressure in NHRA Top Fuel dragsters and Funny Cars is significantly higher than in passenger cars, ranging from 400 to 500 pounds. This high-pressure fuel system is essential to delivering the required amount of fuel to the engine efficiently. The fuel line itself is about 3 inches thick, and the fuel is pumped at a rate of around 100 gallons per minute, resulting in a high-pressure, high-flow system.
The fuel delivery system in a Funny Car is designed to work with the nitromethane-based fuel that powers these vehicles. Nitromethane has a slow burn rate, which means that very rich fuel mixtures may not fully ignite, leading to unburned fuel escaping from the exhaust. This unburned fuel can then ignite in the atmosphere, creating a yellow flame. To compensate for this, the fuel delivery system must provide a precise mixture of fuel and air to the engine, ensuring complete combustion within the cylinders.
The fuel delivery system also plays a role in the overall performance and efficiency of the vehicle. The amount of fuel delivered to the engine can be adjusted based on track conditions and weather changes. By making these adjustments, the team can optimise the vehicle's performance and ensure it runs efficiently, maximising the chances of a successful run.
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Fuel-flow rate
The fuel-flow rate of a funny car is dependent on several factors, including engine specifications, the type of fuel used, and driving conditions. Let's delve into the details:
Engine Specifications:
The engine used in funny cars is typically based on the 426 Hemi design, with a maximum displacement of 500 cubic inches and specific camshaft dimensions. These engines produce an incredible amount of horsepower, with some reaching 11,000 horsepower, or 1,375 horsepower per cylinder. To achieve this level of performance, a significant amount of fuel is required.
Fuel Type and Delivery:
Funny cars typically run on nitromethane fuel, with most teams using a blend of around 88%-90% nitro. This fuel has a high energy density and contributes to the impressive horsepower figures. The fuel is delivered through a constant flow injection system, utilizing a mechanical fuel pump and numerous injectors positioned in various locations within the engine. The fuel line pressure in funny cars is significantly higher than in passenger cars, ranging from 400 to 500 pounds of pressure.
Fuel Consumption and Flow Rate:
The fuel-flow rate in funny cars is quite high due to the demands of the engine. A funny car can consume between 10 and 15 gallons of fuel during a complete pass, which includes the burnout, backup to the starting line, and the quarter-mile run. This equates to a fuel-flow rate of approximately 65 gallons per minute, or 8 to 94 gallons per minute per cylinder, depending on the source. The high fuel-flow rate is necessary to deliver the required amount of fuel to the engine, ensuring optimal performance and horsepower output.
Driving Conditions:
The fuel-flow rate can also be influenced by driving conditions such as weather and track conditions. Adjustments to the fuel delivery system may be made based on atmospheric conditions and track temperature to optimize the engine's performance. These adjustments can include changes to timing, fuel flow, and overdrive settings, ensuring that the funny car performs efficiently and safely during a run.
In summary, the fuel-flow rate of a funny car is a critical aspect of its performance. With high-horsepower engines and the use of nitromethane fuel, these cars require a significant fuel-flow rate to achieve their impressive acceleration and speed capabilities. The specific flow rate can vary depending on engine specifications, fuel type, and driving conditions, but it is undoubtedly a key factor in the world of funny car racing.
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Frequently asked questions
NHRA Top Fuel dragsters and Funny Cars use between 10 and 15 gallons of fuel for a complete pass, including the burnout, backup to the starting line, and quarter-mile run.
The nitromethane used to power the engines of these cars costs about $30 per gallon.
The fuel-line pressure for these cars is between 400 and 500 pounds, about 20 times greater than the pressure on passenger-car fuel pumps.
Today's Funny Cars burn anywhere from 88-94 gallons per minute, while Top Fuelers burn slightly more.
Funny Cars have seen the quickest ET in the 3.80s. They can exceed 280 mph in just 660 feet.
