Katerina Swanson
The size of a fuel line is important for those looking to maximise the power of their vehicles. There are many factors to consider when choosing the right size, such as the type of fuel being used, the desired horsepower, and the length of the fuel line. For example, using E85 fuel requires 30% more fuel to reach stoic conditions, and therefore larger fuel lines. Additionally, the pressure drop through a straight pipe is less than that of an elbow or a 45, which can impact the size requirements of the fuel line. When it comes to horsepower, a BSFC of 1/2 pound of fuel per horsepower is considered safe, and a 3/8id fuel line can support 600 HP with sufficient pump head. For those with 500+ horsepower engines, some recommend using bigger fuel lines, such as a 1/2 line or a number 8 feed minimum, while others claim that a 3/8 line is sufficient. It is also important to consider the corrosive properties of certain types of fuel, such as ethanol-based fuels, and select a fuel line that can withstand them.
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What You'll Learn
Fuel line sizing for power e85 ethanol methanol
The size of a fuel line is very important for those looking to maximise the power of their cars or trucks. Factory fuel lines can generally support around 500 whp, but this varies depending on the vehicle and the fuel being used. For example, E85 fuel requires 30% more fuel to reach stoic conditions, so you would need larger fuel lines.
When it comes to fuel line sizing for power E85 ethanol methanol, it is important to consider the corrosive properties of these types of fuels. Ethanol-based fuels, such as E85, methanol, and other alcohol-based fuels, can be very corrosive and will destroy fuel lines and fuel cells that are not rated to handle them. Therefore, it is crucial to select a fuel line that is specifically designed to withstand these corrosive fuels. One option is to use a PTFE fuel line, which is not prone to temperature and pressure and is, therefore, a good choice for corrosive fuels. However, PTFE fuel lines can be more costly. Another option is to use a Fragola Premium Black Nylon Race Hose, which is designed to hold up to both ethanol and methanol. This hose has a rubber inner lining with impregnated stainless steel reinforcement, making it durable and able to withstand the corrosive effects of ethanol.
In terms of specific fuel line sizes, the general consensus is that a -8AN fuel line is sufficient for fuel feed for power applications up to around 700 whp. For higher power levels, a -10AN fuel line may be necessary, although this will significantly increase the cost. For the return line, a -6AN or -8AN is typically adequate, even for higher power levels. It is worth noting that some people have achieved high power outputs with smaller fuel lines, but this may not be recommended as it could put strain on the fuel system.
Additionally, it is important to consider the length of the fuel line. Longer fuel lines will have a greater pressure drop, which can affect the performance of the fuel system. Therefore, it is crucial to calculate the correct fuel line size and length to ensure optimal performance.
Finally, when designing a fuel system, it is always better to go a little bigger on the line size. The cost difference is not that significant, and it will give you more room for future upgrades and modifications.
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Fuel line sizing for 500 whp
Fuel line sizing is an important consideration for those pushing the limits of power in their cars or trucks. The size of the fuel line impacts the amount of fuel that can flow to the engine, which in turn affects engine performance.
For applications producing 500 whp, a -6AN fuel supply line is generally considered sufficient. This size of fuel line can support over 500 whp, with some users reporting success with factory fuel lines. However, it is important to consider the specific fuel being used, as this can impact the required fuel line size. For example, E85 ethanol fuel requires 30% more fuel to reach stoic conditions, necessitating larger fuel lines. Additionally, the use of ethanol or methanol fuels requires fuel lines that are rated to withstand their corrosive properties.
When designing a fuel system, it is generally recommended to give yourself some breathing room and be realistic with your goals. A larger fuel line may not be necessary to achieve 500 whp, but it can provide benefits such as increased fuel flow and reduced pressure drop. By using a bigger pump, higher pump voltage, and/or increasing the line size, more pump head can be achieved, resulting in improved fuel delivery to the engine.
It is also worth noting that the return fuel line is typically sized smaller than the supply line. This is because the return line flows less fuel, as a portion of the supplied fuel is used by the motor to burn and run.
Overall, when sizing a fuel line for 500 whp, it is important to consider the specific application, the type of fuel being used, and the potential benefits of a larger fuel line in terms of fuel flow and pressure drop. By taking these factors into account, you can ensure optimal engine performance and avoid issues such as fuel starvation or insufficient fuel delivery.
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Fuel line sizing for 500+ hp engines
Fuel line sizing is a crucial aspect of optimising the performance of high-horsepower engines. When considering fuel lines for 500+ hp engines, several factors come into play, including the type of fuel, the specific engine configuration, and the overall design of the fuel system.
For engines in the 500 hp range, the fuel line size typically falls between 3/8" and 1/2". Many users report that a 3/8" fuel line is sufficient for their 500 hp engines, although some recommend upgrading to a 1/2" line to ensure optimal fuel delivery. It's worth noting that a simple equation can help determine the required fuel volume: at Wide Open Throttle (WOT), a Brake Specific Fuel Consumption (BSFC) of 1/2 pound of fuel per horsepower is considered safe, resulting in A/F ratios of 11:1 or richer.
However, it's important to remember that fuel type plays a significant role in fuel line sizing. For example, when using E85 fuel, which requires 30% more fuel to achieve stoichiometric conditions, larger fuel lines are necessary. Similarly, when dealing with ethanol-based, methanol, or other corrosive fuels, it is imperative to use fuel lines rated for these substances to prevent damage and potential clogging issues.
Additionally, the specific engine configuration and fuel system design can influence fuel line sizing. For instance, EFI systems operate at higher pressures, resulting in increased flow rates even in smaller-diameter fuel lines. Therefore, when converting to EFI, it's essential to consider the higher pressure and its impact on fuel delivery.
In conclusion, when sizing fuel lines for 500+ hp engines, it's important to consider factors such as fuel type, engine configuration, and fuel system design. While a 3/8" fuel line can often support 500 hp engines, upgrading to a 1/2" line can provide added performance headroom. Additionally, the use of corrosive fuels requires appropriate fuel lines to prevent damage, and the higher pressures associated with EFI systems should be factored into the overall fuel line sizing decision.
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Fuel line sizing for EFI systems
Fuel line sizing is an important aspect of engine performance, especially for those pushing the limits of power in their cars or trucks. The diameter of the fuel line is critical to achieving the desired horsepower goal. If the diameter is too small, the horsepower goal will not be met, and if it is too large, the lines will take longer to pressurize, leading to potential engine damage.
For a 500HP motor, a number 8 feed is recommended, with a return line back to the cell for more stable and constant fuel pressure. A -6 feed should be able to support 600HP without issues, but for 500HP, a minimum of -8 is suggested. The inside diameter of a -6 feed is just under 3/8", while a --8 feed is just under 1/2". It is also important to consider the fittings, as some -6 fittings have an ID as small as 3/16".
The length of the fuel line and the flow rate are key factors in determining the correct fuel line size. Longer lines and higher flow rates will result in increased friction, which in turn reduces the pressure at which the fuel is delivered. This is why EFI systems are less sensitive to fuel line size than carbureted systems. Carbureted systems experience more pressure loss, and the performance loss is more significant.
When selecting a fuel line, it is important to consider the type of fuel being used. For example, ethanol-based fuels are corrosive and will destroy fuel lines that are not rated to handle them. Additionally, ethanol and methanol require more fuel than gasoline to generate the same HP, so the fuel line size needs to be larger to accommodate the increased flow rate.
In summary, when sizing fuel lines for EFI systems, it is crucial to consider the desired horsepower, fuel type, line length, and flow rate. While a larger diameter is generally preferable, choosing the correct diameter that suits the specific requirements of the engine is the best approach.
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Fuel line sizing for 550 hp
Fuel line sizing is an important consideration for those looking to maximise the power of their vehicles. When it comes to fuel line sizing for 550 hp, there are a few key factors to keep in mind. Firstly, it is recommended to use a fuel line that is rated for alcohol, methanol, or ethanol if you plan on using these types of fuels. These fuels can be very corrosive and will destroy fuel lines that are not rated to handle them.
Another factor to consider is the inner diameter of the fuel line. A common question asked by many is whether a fuel line with a nominal 3/8" inner diameter can support 550 hp. The answer is yes, given sufficient "pump head". Increasing the size of the pump, the pump voltage, or the line size can all contribute to achieving the desired pump head. However, it is worth noting that a bigger pump or higher pump voltage may not always be feasible, in which case increasing the line size may be the best option.
It is generally recommended to use a --8 feed minimum for 550 hp. A -6 feed may also be sufficient, but it is closer to the limit of its capacity. Additionally, the return line should be sized smaller than the supply line, as the return line will always flow less fuel. A --6 return line is commonly used with a --8 supply line.
It is also important to consider the length of the fuel line. Longer fuel lines will result in greater pressure loss, which may require increasing the line size or taking other measures to achieve sufficient pump head. Bends in the fuel line will also contribute to pressure loss.
Finally, it is always recommended to give yourself some breathing room when sizing your fuel lines. Planning ahead and allowing for future upgrades can save you headaches down the line.
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Frequently asked questions
The general consensus is that a 3/8” fuel line is sufficient for 500hp. However, some people recommend a 1/2" line for a street car, and one source recommends a number 8 feed minimum.
The size of the fuel line depends on the vehicle and the type of fuel being used. For example, if using E85, which requires 30% more fuel, you would need to size the fuel lines larger. It's also important to consider the fuel's corrosive properties, as some types of fuel can destroy fuel lines and fuel cells that are not rated to handle them.
If the pressure falls as the engine RPMs go up, you need more pump head, which can be achieved with a bigger pump or higher pump voltage. You can also increase the line size, but it's recommended to check for a dirty fuel filter first, as this is often the culprit of falling fuel pressure.
A larger fuel line can provide more fuel flow, which may be necessary for high-performance engines or when using certain types of fuel. Additionally, a larger fuel line can help accommodate bends in the steel pipe from the gasoline tank to the engine fuel rail.
