Katerina Swanson
Drag racing is an awe-inspiring motorsport that pushes the limits of speed and acceleration. The fastest dragsters can reach speeds of over 300 miles per hour in just a few seconds, subjecting drivers to incredible forces of up to 8 Gs. To achieve these speeds, dragsters are engineered with fuel consumption technology that is unlike anything found in traditional vehicles. The amount of fuel required to power these cars is incredible, with a top fuel dragster consuming up to 1.5 gallons of fuel per second at full throttle. With such extreme fuel usage, the cost of each run can be astronomical, and the risk of engine failure is ever-present.
| Characteristics | Values |
|---|---|
| Engine size | 500 cubic inches |
| Fuel type | Nitromethane, methanol, propolyene oxide, water |
| Fuel consumption per second | 1.5 gallons |
| Fuel consumption per minute | 65 gallons |
| Fuel consumption per quarter-mile run | 4-5 gallons |
| Fuel consumption per complete pass | 10-12 gallons |
| Fuel consumption per run | 22.5-23 gallons |
| Fuel pump capacity per cylinder | 8 gallons per minute |
| Fuel cost | $30 per gallon |
| Minimum weight | 2,100 pounds |
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What You'll Learn
- Top Fuel dragsters use 1.5 gallons of nitromethane per second at full throttle
- NHRA Top Fuel dragsters use 10-12 gallons of fuel for a complete pass
- Top Alcohol Dragsters use supercharged methanol-burning engines
- Pro Stock engines use electronic fuel injection and spec gasoline
- Super Gas entries are prohibited from using exotic fuels
Top Fuel dragsters use 1.5 gallons of nitromethane per second at full throttle
Top Fuel dragsters are powerful machines, capable of accelerating from 0 to 100 mph in under 0.8 seconds. This incredible speed is achieved through the use of large amounts of fuel. During a quarter-mile run, Top Fuel dragsters and Funny Cars can consume between four and five gallons of fuel, equivalent to between 16 and 20 gallons per mile. The fuel used is nitromethane, which costs around $30 per gallon.
At full throttle, a Top Fuel dragster engine consumes 1.5 gallons of nitromethane per second. This fuel consumption is necessary to generate the immense power required for the dragster's performance. The high fuel usage also serves another critical purpose: cooling the valves and piston crown, especially the exhaust valves. Overfuelling is a common method to maintain temperatures within the combustion chamber.
The nitromethane fuel mixture is compressed into a near-solid form before ignition, and the cylinders operate on the verge of hydraulic lock at full throttle. The stoichiometric air/fuel mixture for nitromethane results in a flame front temperature of 7050 degrees Fahrenheit, producing a distinctive yellow flame.
The fuel pumps in a Top Fuel dragster play a crucial role in delivering the required amount of fuel. Each cylinder has a fuel pump capable of pumping eight gallons per minute, contributing to the overall fuel consumption of 15 to 20 gallons for a complete pass, including the burnout, backup to the starting line, and quarter-mile run.
The sheer amount of fuel consumed by these dragsters is a testament to their engineering and performance capabilities, showcasing the delicate balance between power and fuel efficiency in the world of drag racing.
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NHRA Top Fuel dragsters use 10-12 gallons of fuel for a complete pass
NHRA Top Fuel dragsters are powerful machines. They can accelerate from 0 to 100 mph in less than 0.8 seconds, reaching speeds of over 200 mph. To put this into perspective, that's almost 11 seconds faster than a Porsche 911 Turbo.
These dragsters consume a significant amount of fuel. Under full throttle, a Top Fuel dragster engine burns 1.5 gallons of nitromethane per second. That's a similar amount of fuel to what a fully loaded 747 jet consumes, but the dragster engine produces 25% more energy.
The total fuel consumption for a complete pass, including the burnout, backup to the starting line, and quarter-mile run, is between 10 and 12 gallons. This is a remarkable feat, considering the immense power and speed these vehicles achieve.
The fuel pumps on these dragsters are incredibly efficient, delivering up to 65 gallons of fuel per minute, or 8 gallons per minute per cylinder. The nitromethane fuel used in these engines is expensive, costing about $30 per gallon.
The amount of fuel consumed by NHRA Top Fuel dragsters is a testament to the engineering and technology behind these impressive vehicles.
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Top Alcohol Dragsters use supercharged methanol-burning engines
Top Alcohol Dragsters may look similar to Top Fuel dragsters, but they have some significant differences. Top Alcohol Dragsters use a supercharged methanol-burning engine or an injected nitromethane combination. On the other hand, Top Fuel dragsters use supercharged, nitro-burning engines.
Top Alcohol Dragsters were introduced in the 1970s as a replacement for the Top Gas class, which burned gasoline. Initially, alcohol dragsters competed against Funny Cars in a category called Pro Comp. In the 1980s, a separate class called Top Alcohol Funny Car was created.
Top Alcohol Dragsters may be powered by one of two different powerplants: a supercharged methanol-burning engine or an injected nitromethane combination. The supercharged engines are 471 cid, while the nitro engines are 331 cid, but both make around 4,000 hp. Weights vary according to the combination but are generally between 1,975 and 2,125 pounds.
Top Alcohol Dragsters can perform in the 5.1-second range at speeds of more than 285 mph. In comparison, Top Fuel dragsters can cover the dragstrip in less than 3.7 seconds at speeds exceeding 330 mph. Top Fuel dragsters consume 15-20 gallons of nitromethane fuel during a single run. Under full throttle, a Top Fuel dragster engine consumes 1.5 gallons of nitromethane per second.
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Pro Stock engines use electronic fuel injection and spec gasoline
Pro Stock engines are a class of drag racing engines that use electronic fuel injection and spec gasoline. This class of engines emerged from the production-based super stock in 1970 with a more liberal set of rules and no handicaps. Initially, the rules favoured big block V8s with Chrysler Hemi engine-powered cars winning the world title for the first two years.
Pro Stock engines are used in "factory hot rods", which are so-called because of their resemblance to production-based automobiles. They are some of the most technologically advanced machines in drag racing. Built around a sophisticated tube chassis and four-link rear suspension, Pro Stock cars must conform to precise measurements and weigh no less than 2,350 pounds, including the driver.
Pro Stock engines are restricted to a maximum of 500 cubic inches and can make in excess of 1,300 horsepower. A competitive Pro Stock car can run in the 6.5s at more than 210 mph. These highly modified vehicles, which can run under 6.8 seconds at more than 195 mph, feature a purpose-built tube chassis and a lightweight, aerodynamically enhanced replica of the original bodywork.
The class features a wide variety of makes, models, and engines, including V-Twin entries from Harley-Davidson, Victory, EBR, and Buell, and inline four-cylinder-equipped Suzuki and Kawasaki models. Engine sizes vary widely, ranging from 92 to 160 cubic inches. Fuel injection is permitted, and spec gasoline is the only fuel allowed.
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Super Gas entries are prohibited from using exotic fuels
While drag racing is a sport that involves powerful cars and a lot of fuel, there are different classes and categories of vehicles, each with its own set of rules and regulations regarding fuel usage and engine specifications. One such category is the Super Gas class, which consists of full-bodied cars and street roadsters. The rules for Super Gas entries are quite liberal when it comes to engine and chassis modifications, but there is a restriction on the use of exotic fuels.
In the context of racing, exotic fuels can include ethanol, methanol, ether, and other "oxygenates." These types of fuel have the potential to significantly increase the horsepower generated by the engine. However, in drag racing competitions like the Super Gas class, the focus is on the skill of the driver and the performance of the vehicle within certain specified parameters. Allowing exotic fuels could give an unfair advantage to those with access to specialised blends, potentially creating an uneven playing field.
Additionally, the use of exotic fuels may introduce safety concerns. These fuels are designed to maximise horsepower, but this can come at the cost of increased stress on the engine and other mechanical components. In a sport where vehicles are already pushed to their limits, the additional strain introduced by exotic fuels could lead to mechanical failures, endangering both the drivers and spectators. Therefore, the prohibition of exotic fuels in the Super Gas class serves to maintain fairness in competition and help ensure the safety of all participants.
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Frequently asked questions
A top fuel dragster uses about 4 to 5 gallons of nitromethane for a quarter-mile run in about 4.5 to 5 seconds.
Dragsters use a mixture of high nitromethane, which reduces the amount of oxygen running through the engine at high speeds.
A top fuel dragster uses about 15-20 gallons of fuel per cylinder.
A top fuel dragster uses about 75 gallons of fuel per minute.
A top fuel dragster can have up to 11,000 horsepower.
