Katerina Swanson
Top Fuel and Funny Car engines are based on the Chrysler Hemi and are capable of producing 11,000 horsepower. These engines burn roughly 15 gallons of fuel in a single run, with a maximum fuel flow of 90 gallons per minute. The engines are lubricated and cooled by lubricating oil and the incoming air/fuel mixture. The amount of oil used by these engines is not clear, but it is likely to be a significant quantity given the high power output and the need for lubrication and cooling.
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What You'll Learn
Fuel type: nitromethane, not gasoline
Top Fuel dragsters, also known as "nitro-burning" engines, are designed to burn nitromethane rather than gasoline. Nitromethane is a more powerful fuel than gasoline, as it can generate up to 2.4 times as much power. This is because nitromethane has its own oxygen atoms, which gasoline lacks, and therefore requires less atmospheric oxygen to burn. This means that an engine can burn 7.6 times more nitromethane than gasoline.
The NHRA (National Hot Rod Association) has placed limits on the composition of the fuel used in these cars, mandating that the maximum concentration of nitromethane be no more than 90%. The remaining 10% is typically methanol, which helps to suppress detonation and pre-ignition. The fuel mixture is not mandatory, and less nitromethane may be used if desired.
The amount of nitromethane used in a Top Fuel engine varies depending on the specific engine and racing conditions. During idle, a flow rate of 8 gallons per minute (64 gallons per minute for all eight cylinders) was recorded, while today's Funny Cars burn anywhere from 88-94 gallons per minute. The total fuel consumption for one run is between 22.5 and 23 gallons.
Nitromethane's high latent heat of vaporization means it absorbs substantial engine heat as it vaporizes, providing an invaluable cooling mechanism. This, along with its slow burn rate, results in flames shooting out of the exhaust pipes, a distinctive feature of Top Fuel dragsters.
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Fuel rules: NHRA mandates a maximum 90% concentration of nitromethane
The NHRA mandates a maximum concentration of 90% nitromethane in the fuel used by Top Fuel and Funny Car engines. This rule was introduced in 2000, but following a fatality at the Gateway International Raceway in 2004, the fuel ratio was reduced to 85%. This reduction was rescinded in 2008 due to complaints from teams about the costs and mechanical failures associated with the lower nitromethane mixture.
Nitromethane is a key component of the fuel used in these high-performance engines, providing its own oxygen supply and enabling a higher compression ratio, resulting in increased power output. The engines in Top Fuel and Funny Car vehicles are based on the Chrysler Hemi design, producing up to 11,000 horsepower and capable of reaching speeds of over 300 mph.
To deliver the massive amounts of fuel required, these engines utilize multiple injectors located throughout the engine. The fuel line is approximately 3 inches thick, and the fuel pumps can flow up to 100 gallons per minute, with some engines burning as much as 94 gallons per minute. The fuel also serves to cool the engine and produce impressive exhaust flames.
The high-performance nature of these engines means that many components are only good for a limited number of runs before requiring replacement. The engines are meticulously maintained, with oil changes and inspections performed after each run. The oil pressure in a Top Fuel or Funny Car engine can reach up to 300 psi when cold, and the engines operate at extremely high RPMs, contributing to the high maintenance requirements.
While the NHRA has implemented rules to regulate fuel composition and engine specifications, teams have some flexibility in engine design and can choose their own components within certain constraints. The NHRA rules specify a maximum engine size of 500 cubic inches and a camshaft size of no more than 54mm.
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Fuel flow: up to 90 gallons per minute
Fuel flow is a critical aspect of Top Fuel and Funny Car engines, with the ability to deliver massive amounts of fuel to the engine being a key requirement. These engines burn a significant amount of fuel, with estimates ranging from 15 gallons per run to up to 23 gallons for a 1000-foot distance. The fuel line is approximately 3 inches thick, and the fuel pumps can flow at an incredible rate of up to 90 gallons per minute. This high fuel flow rate is necessary to support the extreme horsepower and performance of these vehicles.
The engines in Top Fuel and Funny Cars are based on the Chrysler Hemi design, producing up to 11,000 horsepower. This exceptional power output is achieved through the use of nitromethane fuel, which has a higher energy density than gasoline due to its oxygen content. The nitromethane fuel allows for a lower air-fuel ratio, with a 2:1 or even 1:1 ratio being used. The excess fuel helps to cool the engine and produces impressive exhaust flames.
To deliver the required fuel flow rates, these engines utilize multiple injectors positioned in various locations. According to NHRA crew chief Rob Flynn, there are typically six nozzles in front of the blower and another four located behind it for lubrication. Most teams also have one nozzle in the manifold, while some have an additional nozzle in the intake port. These nozzles contribute to the high fuel flow rate and ensure that the engine receives an adequate supply of fuel during operation.
The high-performance nature of Top Fuel and Funny Car engines comes with certain challenges and considerations. For instance, the engines must be carefully tuned to balance performance and fuel efficiency. Additionally, the extreme conditions result in high temperatures, requiring the use of lubricating oil and the incoming air/fuel mixture for cooling. The engine components, such as pistons and cylinder heads, are subjected to tremendous forces and require regular examination and replacement.
In summary, the fuel flow rate of up to 90 gallons per minute in Top Fuel and Funny Car engines is a critical aspect of their performance. The ability to deliver massive amounts of fuel supports the incredible horsepower and speed of these vehicles. The use of nitromethane fuel, strategic injector placement, and careful engine tuning all contribute to the high fuel flow rate and overall performance of these exceptional racing machines.
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Fuel efficiency: 15 gallons for a single run
Top Fuel and Funny Car engines are based on the Chrysler Hemi, with some sources specifying the Chrysler RB Hemi. These engines can make 11,000 horsepower, or 1,375 horsepower per cylinder. They are capable of reaching speeds of up to 340 mph and can go from 0 to 100 mph in under 1 second.
To achieve these incredible speeds, a lot of fuel is needed. A Top Fuel or Funny Car will burn roughly 15 gallons of fuel in a single run. This works out at a flow rate of around 8 gallons per minute, or 64 gallons per minute for all eight cylinders. At maximum pull, these engines can flow 90 gallons of fuel per minute.
The fuel used in these cars is nitromethane, which includes its own oxygen, meaning it only needs a 2:1 air-fuel ratio, or even a 1:1 ratio. This is in contrast to the standard 14.7:1 ratio of gasoline. The high oxygen content of nitromethane also means that excess fuel can be used to cool the engine and produce flames from the exhaust.
The NHRA mandated in 2000 that the maximum concentration of nitromethane in a car's fuel be no more than 90%. This was reduced to 85% following a fatality in 2004 but was later returned to 90% due to complaints from teams about mechanical failures and the associated costs.
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Engine specifications: based on Chrysler Hemi, with 11,000 horsepower
Top Fuel and Funny Car engines are based on the Chrysler Hemi, generating an incredible 11,000 horsepower. This equates to a staggering 1,375 horsepower per cylinder. The engine's design includes two large valves per cylinder, with the intake valve made from solid titanium and the exhaust from solid Nimonic 80A or similar material. The valves are larger than standard, measuring around 2.45 inches for the intake and 1.925 inches for the exhaust. The heads are secured to the block with aircraft-rated steel studs and stud nuts, and sealed with copper gaskets and stainless steel o-rings. The camshaft is made from billet steel, using 8620 carbon or S7 through-hardened tool steel.
The engine's block is machined from forged aluminium, featuring ductile iron cylinder liners. The deep skirt design adds strength, and the lack of water passages further enhances the block's strength and stiffness. The engine is cooled by the incoming air/fuel mixture and lubricating oil. The cylinder heads are also machined from aluminium billets, and they too lack water jackets, relying on the incoming air/fuel mixture and oil for cooling.
Pistons are made of forged aluminium, with an anodized and Teflon coating to prevent galling during high thrust load operations. The pistons have three rings, with aluminium buttons retaining the steel wrist pin. The top ring is an L-shaped "Dykes" ring, providing an optimal seal during combustion. A second ring is used to prevent excessive oil from entering the combustion chamber, as the Dykes ring offers less-than-ideal reverse gas/oil sealing.
The fuel used in these engines is nitromethane, which includes its own oxygen supply, allowing for a higher ratio of fuel to air. This results in a very rich mixture, with excess fuel used to cool the engine and produce impressive exhaust flames. The fuel lines are about 3 inches thick, and the fuel pumps have an extremely high flow rate, with Funny Cars burning anywhere from 88-94 gallons per minute. The engines consume a massive amount of fuel, with a single run burning approximately 15 gallons.
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