Regan Brown
Top Fuel dragsters are the quickest-accelerating racing cars in the world, with the fastest competitors reaching speeds of 338.94 mph and finishing 1,000-foot runs in 3.641 seconds. These cars are designed to go as fast as possible in 1,320 feet and are powered by a supercharged and fuel-injected 500-cubic-inch adaptation of the famed Chrysler Hemi engine. Top Fuel dragsters do not use a transmission but transmit power to the rear wheels through a multistage clutch assembly. With such high speeds and acceleration, Top Fuel drag racing is incredibly dangerous, and the engine generates around 150 dB of sound at full throttle, enough to cause physical pain or even permanent damage.
| Characteristics | Values |
|---|---|
| Top speed | 338.94 mph |
| Acceleration | 0-100 mph in 0.8 seconds |
| Engine displacement | 500 cubic inches |
| Engine power | 11,000 hp |
| Fuel consumption per run | 5-6 gallons of nitro methane fuel |
| Fuel consumption rate | 90 gallons per minute |
| Engine configuration | Based on second-generation Chrysler RB Hemi |
| Engine sound | 150 dB |
| G-force | 5 Gs |
| Base weight | 1,975-2,125 pounds |
| Race-ready weight | 2,330 pounds |
| Length | 25 feet |
| Wheelbase | 300 inches |
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What You'll Learn
Top Fuel Dragsters: the quickest accelerating racing cars
Top Fuel dragsters are the quickest-accelerating racing cars in the world. They are also the fastest sanctioned category of drag racing, with the fastest competitors reaching speeds of 338.94 miles per hour (545.5 km/h) and finishing 1,000-foot (304.8 m) runs in 3.641 seconds. These cars accelerate from a standstill to 100 mph (160.9 km/h) in as little as 0.8 seconds, subjecting the driver to an average acceleration of about 4.0 g0 (39 m/s2) and a peak of over 5.6 g0 (55 m/s2). This extreme acceleration is more than that experienced during a fighter jet launch and is even greater than the g-force of a space shuttle launch (3 Gs).
The engine of a Top Fuel dragster generates around 150 dB of sound at full throttle, which is enough to cause physical pain or even permanent damage to one's hearing. As a result, race announcers usually advise spectators to protect their ears, and ear protection is often provided to fans at the entrance of events.
The engine used to power a Top Fuel drag racing car is based on a second-generation Chrysler RB Hemi but is built exclusively from specialized parts. The engine has hemispherical combustion chambers, a 58-degree valve stem angle, and a 4.8-inch (121.92 mm) bore pitch. The block is machined from forged aluminum and features ductile iron cylinder liners. The engine is cooled by the incoming air/fuel mixture and lubricating oil, and it has a deep skirt for strength, similar to the original Hemi.
Top Fuel dragsters have been around for decades, and their performance continues to improve year after year due to advancements in engineering and technology. The current speed record stands at 338.17 mph, set in 2021, which is nearly 100 mph faster than the record of 239.64 mph set in 1972.
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Top Fuel engines: the engineering behind the power
Top Fuel dragsters are the quickest-accelerating racing cars in the world, reaching speeds of up to 338.94 miles per hour (545.5 km/h) and finishing 1,000-foot runs in as little as 3.641 seconds. They are powered by engines that produce over 10,000 horsepower, generating around 150 dB of sound at full throttle—enough to cause physical pain or even permanent damage to spectators.
The engine used in Top Fuel drag racing is based on a second-generation Chrysler RB Hemi but is built exclusively from specialized parts. The engine has two valves per cylinder, a 58-degree valve stem angle, and a 4.8-inch bore pitch. The block is machined from a piece of forged aluminum with ductile iron cylinder liners. The engine is cooled by the incoming air/fuel mixture and lubricating oil, and it features five main bearing caps fastened with aircraft-standard-rated steel studs and additional reinforcing bolts.
Top Fuel engines are designed to run on a fuel mixture of up to 90% nitromethane, with the remainder mostly being methanol. Nitromethane has a lower energy density than gasoline or methanol, but it can produce up to 2.4 times as much power because it already has oxygen in its molecular composition, which the engine needs to generate force. Additionally, nitromethane absorbs substantial engine heat during vaporization, providing an invaluable cooling mechanism.
To maximize power output, Top Fuel dragsters use a large positive displacement Roots-type supercharger that can absorb around 1,000 horsepower and reach pressures of up to 65 PSI. The rear tires of these vehicles weigh 21 kilograms each and are bolted onto 16-inch wheels to handle the enormous acceleration. The low tire pressure, combined with the extreme power, causes the tires to deform, creating a larger contact patch and increasing friction.
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Top Fuel vs. Funny Cars
Top Fuel dragsters are the quickest-accelerating racing cars in the world and the fastest sanctioned category of drag racing. The fastest competitors reach speeds of 338.94 mph and finish 1,000 ft runs in 3.641 seconds. They accelerate from 0 to 100 mph in just 0.8 seconds, subjecting the driver to an average acceleration of about 4.0 g0 over the duration of the race, with a peak of over 5.6 g0. Top Fuel engines produce so much power and force that they need to be rebuilt after each run down the track. The engine is based on a second-generation Chrysler RB Hemi but is built exclusively from specialized parts. The engine has hemispherical combustion chambers, a 58-degree valve stem angle, and a 4.8-inch bore pitch. The block is machined from a piece of forged aluminum and features ductile iron cylinder liners. There are five main bearing caps, which are fastened with steel studs.
Funny Cars, on the other hand, are powered by the same supercharged and fuel-injected 500-inch engines as Top Fuel dragsters. They are capable of speeds in excess of 330 mph and can run in the 3.8-second range. They have a shorter wheelbase than a dragster, which makes them unstable and harder to drive. They are also harder to see out of due to the cloud of clutch dust.
Both Top Fuel and Funny Cars burn gallons of nitromethane fuel during a race. The average run down the track for a Top Fuel car will use 5-6 gallons of fuel, while a Top Fuel engine can consume between 12 and 22.75 gallons of fuel during a quarter-mile run.
While Top Fuel cars are faster, Funny Cars have their own quirks and characteristics that make them very different to drive. The classes run at nearly the same speeds, but the way each type of car makes that speed is different.
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Top Fuel speed records
Top Fuel dragsters are the quickest-accelerating racing cars in the world. They can accelerate from a standstill to 100 mph in just 0.8 seconds and can exceed 297 mph in 660 feet. These cars are designed to go as fast as possible in 1,320 feet (a quarter of a mile).
The speed records for Top Fuel dragsters have increased steadily over the years. In 1959, the first U.S. Fuel and Gas Championship was won by Bob Hansen, with a speed of 136 mph. By 1972, the speed record had increased to 239.64 mph.
In 2018, Tony Schumacher set a national speed record of 336.57 mph in Phoenix. In 2019, Brittany Force broke this record, achieving a speed of 338.17 mph in her Flav-R-Pac dragster at the NHRA Midwest Nationals. Force and her crew chief, David Grubnic, have consistently broken speed records, and they now own the 10 fastest 1,000-foot speeds in NHRA Top Fuel history.
In 2022, Brittany Force once again reset the national speed record to 338.48 mph at the NHRA Midwest Nationals. This record-breaking run was made in her Flav-R-Pac dragster, defeating her teammate Austin Prock with a pass of 3.665.
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Top Fuel safety considerations
Top Fuel drag racing is a dangerous sport, with cars reaching speeds of up to 338 mph and subjecting drivers to an average acceleration of about 4.0 g0 over the duration of the race, with a peak of over 5.6 g0. As such, there are a number of safety considerations that must be made to ensure the protection of drivers, spectators, and the surrounding environment.
Firstly, Top Fuel dragsters use nitromethane as their fuel, a highly volatile and explosive substance. In the early days of drag racing, nitromethane was responsible for both record-breaking speeds and dangerous engine failures, leading the NHRA to ban its use in 1957. With improved safety regulations and engine technology, the ban was lifted in 1962, but nitromethane still poses safety risks that must be carefully managed. It is crucial that those handling nitromethane are familiar with emergency procedures and abide by safety rules and instructions to protect themselves and their surroundings. This includes using the right tools, having spill response kits ready, and ensuring the vehicle is in a designated fuelling area with its engine turned off.
Secondly, Top Fuel engines produce around 150 dB of sound at full throttle, enough to cause physical pain or even permanent damage to spectators. Therefore, it is important that spectators are advised to cover their ears and that ear protection is provided to fans at the entrance of a Top Fuel event.
Thirdly, the extreme speed and power of Top Fuel dragsters mean that their engines need to be rebuilt after each run down the track. The team has only 75 minutes to tear down the engine, replace damaged or worn parts, and reassemble it before the next run. This rapid rebuild process must be carefully executed to ensure the engine does not fail during the next run, which could result in a catastrophic failure or accident.
Finally, due to the high speeds and g-forces involved in Top Fuel racing, there are safety considerations regarding the physical health of the drivers. The g-force experienced by Top Fuel drivers is more than that of a space shuttle launch and prolonged exposure could lead to loss of sight or consciousness. As Top Fuel races only last a few seconds, this is usually not an issue, but it is still an important consideration for driver safety.
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Frequently asked questions
Top fuel dragsters do not use a transmission. Instead, they transmit power to the rear wheels through a multistage clutch assembly that is activated by timers.
Top fuel dragsters are the quickest-accelerating racing cars in the world and the fastest sanctioned category of drag racing. The fastest competitors reach speeds of 338.94 mph (545.5 km/h) and finish 1,000-foot runs in 3.641 seconds.
The engine used to power a top fuel drag racing car is based on a second-generation Chrysler RB Hemi but is built exclusively from specialized parts. The engine has hemispherical combustion chambers, a 58-degree in-to-ex valve stem angle, and a 4.8-inch bore pitch.
The average run down the track for a top fuel dragster will use 5-6 gallons of nitro-methane fuel. The fuel consumption rate is over 90 gallons per minute.
