Mercedes Mullins
When it comes to high-performance engines, the fuel line size is a critical component. With 1200 horsepower, the fuel demand is significantly higher, and the right fuel line size ensures optimal engine performance. While some may assume that increasing horsepower requires a larger fuel line, this is not always the case. Oversized fuel lines can negatively impact flow velocity, and the key lies in finding the perfect balance between line size and pump efficiency. In this discussion, we delve into the intricacies of fuel line sizing for a 1200 HP engine, exploring the challenges and considerations faced by automotive enthusiasts and engineers alike.
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What You'll Learn
Fuel line sizing
For a 1200 HP engine, a fuel line with a 3/8" inner diameter is generally considered sufficient. This is supported by the fact that some race cars with 1000+ HP engines use stock 3/8" hard lines. Additionally, a 3/8" ID fuel line can support 600 HP with sufficient "pump head", and with a big enough pump, it could even support 1000 HP.
It is important to note that the type of fuel also plays a role in fuel line sizing. For example, E85, an ethanol-based fuel, has a lower BTU heat content than gasoline, and therefore requires a higher volume of fuel to produce the same power. As a result, the pressure drop over a long feed line becomes a major concern, and it becomes a balancing act between line length and diameter to maintain decent fuel velocity and flow.
When designing a fuel system, it is crucial to pay attention to the electrical side of the pump. As fuel pressure increases, the amperage demand also increases, placing an increased load on the charging system and requiring a review of the wire gauge to ensure it can handle the current.
In summary, while a larger diameter fuel line is generally better, the correct diameter is the best choice. For a 1200 HP engine, a 3/8" ID fuel line is generally considered sufficient, but it is important to consider the type of fuel and the electrical demands of the pump to ensure optimal performance.
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Fuel pump sizing
The key principle to understand is that the fuel pump must deliver sufficient fuel flow to meet the engine's demands. This is influenced by factors such as fuel type, pressure, and injector sizing. For example, E85 ethanol-based fuel requires a higher volume of fuel compared to gasoline to produce the same power due to its lower BTU heat content. Additionally, higher pressures result in decreased pump output, so this must be carefully regulated to ensure optimal flow.
When selecting a fuel pump, it is essential to consider the injector sizing to choose the right pump for the specific engine. Aeromotive, a reputable manufacturer, offers a range of high-performance pumps, including the Pro Series brushless electric pumps with ratings of 3.5 and 5.0 gallons-per-minute (gpm). Their Eliminator brushless pump, rated at 3.0 gpm, can deliver 1,116 lbs/hr of fuel at 70 psi, which is suitable for engines producing around 1,080 lbs/hr.
The electrical side of the pump is another critical factor. Higher fuel pressures result in increased amperage demand, which places a greater load on the charging system and requires careful selection of wire gauge to handle the current and prevent voltage drop. It is recommended to perform a dynamic voltage drop test to ensure the system is sized correctly, maintaining stable voltage at the pump to keep it from slowing down under increased pressure.
Lastly, while it may seem advantageous to use oversized fuel lines, it is important to note that excessively large fuel lines can negatively impact flow velocity and cause fuel pressure fluctuations. Therefore, it is a balancing act between line length and diameter to maintain optimal fuel velocity and flow, especially at extreme horsepower levels.
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Fuel type
E85 fuel, for instance, demands a significantly higher volume of fuel compared to gasoline due to its lower BTU heat content. To produce the same power with E85, you would need to burn approximately 30% more fuel in comparison to gasoline. This increased fuel demand can result in a substantial pressure drop over a long feed line, making it a critical factor in fuel line selection.
Methanol is another fuel type that requires a larger volume of fuel compared to gasoline. According to sources, methanol can double the volume of fuel needed when compared to gasoline.
Sprint cars, for example, typically utilise a single -6AN fuel line to feed the barrel valve when running on methanol at 750 horsepower. On the other hand, an EFI system with a single -10 fuel line would be excessive for this setup.
When using gasoline, the fuel line requirements differ. For instance, a single -6AN fuel line is capable of delivering 1000 horsepower at 65 psi fuel pressure. This is a notable improvement over the standard fuel lines found in Turbo Buicks, which have a smaller inner diameter.
It is worth noting that the type of engine and fuel system can also influence the fuel line size. Carbureted engines, for instance, tend to operate at lower pressures and often require larger fuel lines compared to EFI systems. However, it is always recommended to consult professionals or experts for specific combinations of engine, fuel type, and horsepower to determine the exact fuel line size and pump requirements.
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Fuel pressure
Firstly, let's discuss fuel pressure and its impact on engine performance. Fuel pressure refers to the force at which fuel is delivered to the engine, typically measured in pounds per square inch (psi). The required fuel pressure can vary depending on the type of engine and fuel delivery system. For example, naturally aspirated, carbureted engines typically operate at lower fuel pressures, around 15 psi, while electronic fuel injection (EFI) systems have higher base fuel pressures, ranging from 43 to 58 psi or more. Higher fuel pressures are necessary to atomize the fuel properly and ensure adequate delivery to the engine at higher horsepower levels.
However, it is important to note that as fuel pressure increases, the volume of fuel that can be delivered decreases. This inverse relationship between pressure and volume is a fundamental principle to consider when designing the fuel system. Therefore, when dealing with extreme horsepower levels, such as 1200 hp, achieving the right balance between fuel pressure and flow rate becomes crucial.
Now, let's talk about fuel line sizing and its impact on fuel pressure and flow. The diameter and length of the fuel line can significantly affect fuel pressure and flow. Using oversized fuel lines can lead to excessive fuel pressure fluctuations and a decrease in flow velocity, which should ideally be maintained between 3 to 12 feet per second on the pressure side of the system. On the other hand, using fuel lines that are too small can restrict flow and hinder the fuel delivery to the engine.
To ensure optimal fuel pressure and flow, it is recommended to use fuel lines with an appropriate diameter for the specific engine and fuel combination. For example, an EFI system with a single -10 fuel line may be overkill for a 1200 hp engine, and a smaller diameter line might be more suitable. Additionally, the length of the fuel line should be considered, as longer lines can add to the load on the fuel pump, leading to potential pressure and flow losses.
In summary, achieving the right fuel pressure and flow rate is essential for reliable engine performance, especially at high horsepower levels like 1200 hp. Proper fuel line sizing, including diameter and length, plays a crucial role in maintaining optimal fuel pressure and flow while avoiding issues such as fuel starvation or lean conditions. It is important to consult experts, follow manufacturer recommendations, and consider the specific engine and fuel combination when designing the fuel system to ensure optimal performance.
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Fuel velocity
Let's begin by understanding the impact of fuel type. E85, an ethanol-based fuel, has a lower BTU heat content than gasoline. As a result, to generate the same power, approximately 30% more E85 fuel must be burned compared to gasoline. This higher fuel demand translates directly into increased fuel flow requirements, which can lead to significant pressure drops over long feed lines. Therefore, when selecting a fuel type, be mindful of the trade-off between fuel velocity and flow, especially at extreme horsepower levels.
Fuel line sizing plays a crucial role in maintaining the desired fuel velocity. While larger fuel lines might seem advantageous, they can actually be detrimental to flow velocity. Some race teams have found that oversized fuel lines and fuel rails can disrupt flow velocity, which ideally should be maintained within the range of 3 to 12 feet per second on the pressure side of the system. Overly large fuel lines can cause excessive fuel pressure fluctuations, negatively impacting the overall efficiency of the fuel system. Therefore, it's essential to strike a balance between line length and diameter to ensure optimal fuel velocity and flow.
To further complicate matters, the type of engine and fuel delivery system must be taken into account. Carbureted engines, for instance, tend to operate at lower pressures and thus require larger fuel lines compared to EFI (Electronic Fuel Injection) systems. EFI systems, on the other hand, run at significantly higher pressures, allowing them to utilize smaller fuel lines effectively. Additionally, the specific demands of your engine setup should be considered. For example, a supercharged or turbocharged engine will have distinct fuel delivery requirements compared to a naturally aspirated engine.
The selection of an appropriate fuel pump is another key factor in achieving the desired fuel velocity. The pump must be capable of delivering sufficient fuel volume at the required pressure. Pump output tends to decrease as pressure increases, so this relationship should be carefully analyzed when choosing a pump. Additionally, the electrical side of the pump should not be overlooked, as higher fuel pressures will result in increased amperage demands, requiring careful consideration of wire gauge to prevent voltage drops.
Lastly, it's important to recognize the interplay between fuel velocity and engine performance. A well-designed fuel system, with proper fuel line sizing and pump selection, will contribute to the overall efficiency and responsiveness of the engine. By minimizing pressure losses and maintaining optimal fuel velocity, you can ensure that your 1200 HP engine receives the necessary fuel volume to perform at its peak potential.
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Frequently asked questions
A 3/8”ID fuel line can support 600 HP given sufficient “pump head”. A 3/8” steel line could support 1000 HP with a big enough pump. A –6AN line can easily feed 1000hp @ 65psi fuel pressure. An 8AN line should be plenty for 1200 HP.
A pump capable of 1,250 lbs/hr at 70 psi is recommended. Aeromotive's Pro Series of brushless electric pumps can move a lot of fuel at high pressure. The 3.5 gpm pump will deliver 1,302 lbs/hr of fuel flow.
Oversized fuel lines can kill flow velocity, which should be 3 to 12 feet per second on the pressure side of the system. Pressure drop over a long feed line is a concern, especially with E85’s high fuel flow requirements. A dirty fuel filter is often the culprit of falling fuel pressures.
At WOT (Wide Open Throttle), a BSFC (Brake Specific Fuel Consumption) of 1/2 pound of fuel per horsepower is safe. Since gasoline has a weight of 5.994 lbs/gallon, we need 1 gallon of gasoline per 12 HP.
