Mercedes Mullins
When it comes to high-performance engines, selecting the appropriate fuel line size is critical. The choice of fuel plays a significant role in determining the ideal fuel line size, especially when aiming for high horsepower outputs. In the case of E85 ethanol fuel, it demands approximately 30% more fuel compared to gasoline to achieve the same power level. This article will explore the considerations and recommendations for fuel line sizing when using E85 fuel with a turbocharger to achieve 1000 horsepower. We will delve into the factors influencing fuel line selection and provide insights from real-world applications to ensure optimal performance and avoid common pitfalls.
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What You'll Learn
- E85 requires 30% more fuel than gasoline to reach the same power level
- A 3/8” steel fuel line can support 1000 HP with a big enough pump
- For 1000 HP on gasoline, an 8AN feed and 6AN return line is sufficient
- For 1000 HP on E85, a 10AN feed and 8AN return line is recommended
- The return fuel line is always sized smaller than the supply line
E85 requires 30% more fuel than gasoline to reach the same power level
E85 is a specialised fuel that boosts engine power. It is a blend of gasoline and ethanol, with 85% ethanol and 15% gasoline. It has a higher octane rating than gasoline, which means it can withstand higher compression ratios and temperatures without detonating.
E85 has a higher octane rating than regular gasoline, which allows for more aggressive timing and increased power output in engines designed to take advantage of it. The higher octane rating of E85 results in improved fuel atomization and better fuel distribution within the combustion chamber, leading to more efficient combustion and increased power. This means that E85 requires a higher fuel flow rate compared to gasoline to maintain the same air-fuel ratio.
Ethanol contains more oxygen than gasoline, which is required for the combustion process. The additional oxygen in E85 supports more complete combustion, resulting in a more efficient and powerful burn in the engine. However, this also means that E85 requires 30% more fuel than gasoline to reach stoic conditions and the same power level.
When planning the size of your fuel lines, it is important to be realistic about your goals and give yourself some breathing room. For most applications, factory fuel lines have supported around 500 whp, but this varies based on the vehicle and the fuel being used. If you are using E85, you will need to size your fuel lines even larger than for gasoline. For example, users have reported success with -8AN feed and -6AN return fuel lines for setups with 550-600whp, while setups with 600-750whp have used -10AN feed and -8AN return lines.
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A 3/8” steel fuel line can support 1000 HP with a big enough pump
When it comes to high-horsepower applications, one of the key considerations is fuel line sizing. It is a common misconception that increasing the size of a fuel line is necessary to support higher horsepower. For instance, it is often suggested that a fuel line should be increased from a #6 to a #8 or #10 to support 600 HP. However, this is not always the case, and a 3/8" steel fuel line can indeed support 1000 HP with a big enough pump.
The pumping power is the critical factor in ensuring sufficient fuel supply, and a larger pump can compensate for any potential deficiencies in a smaller fuel line. This is because a bigger pump can deliver more fuel at a higher pressure, ensuring that the engine receives the necessary amount of fuel to generate the desired horsepower. It is worth noting that the type of pump can also play a role, with electric pumps generally being better suited for smaller fuel lines due to their ability to push fuel more effectively.
Additionally, it is important to consider the dynamic flow of the fuel line. In some cases, a larger fuel line may be necessary to prevent the fuel pump from having to overcome flow friction, especially in quick-acceleration scenarios such as drag racing. However, this depends on the specific engine setup, and a 3/8" fuel line is generally capable of supporting 1000 HP with the appropriate pump.
It is worth noting that when using E85 fuel, it is recommended to increase the flow by around 30%. This is because E85 fuel requires a larger volume of fuel to achieve stoichiometric conditions, which is essential for optimal engine performance. In such cases, sizing the fuel line larger than 3/8" may be necessary to accommodate the increased flow requirements of E85 fuel.
In conclusion, a 3/8" steel fuel line can support 1000 HP with a big enough pump. However, it is important to consider factors such as pumping power, dynamic flow, and the type of fuel being used to ensure optimal engine performance and avoid potential issues such as flow friction.
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For 1000 HP on gasoline, an 8AN feed and 6AN return line is sufficient
When it comes to achieving 1000 horsepower on gasoline, the consensus is that an 8AN feed and 6AN return line is sufficient. This setup strikes a balance between providing enough fuel flow to meet the engine's demands and keeping costs in check.
The 8AN feed line, also known as the supply or inlet line, delivers fuel from the tank to the engine. The "AN" designation refers to the Army-Navy thread specification, which is a standard for fuel line sizing. An 8AN line has an outer diameter of 13/32 inches and an inner diameter of 3/8 inches, allowing for a substantial amount of fuel to flow through. This size is commonly used in high-horsepower applications and is known for its ability to support well over 600 horsepower.
On the other hand, the 6AN return line, also referred to as the outlet line, carries any unused fuel back to the tank. The return line typically has a smaller diameter than the feed line because the engine uses a portion of the supplied fuel, resulting in less fuel flowing back. A 6AN line has an outer diameter of 3/4 inches and an inner diameter of 9/32 inches, which is sufficient for the return flow of fuel in a 1000-horsepower setup.
It's important to note that while an 8AN feed and 6AN return line can support 1000 horsepower on gasoline, transitioning to E85 ethanol fuel requires a larger fuel line. E85 fuel demands approximately 30% more fuel than gasoline to reach the same power levels. As a result, a 10AN feed and an 8AN return line are recommended for E85 applications with 1000 horsepower. This increase in fuel line size accommodates the higher fuel flow requirements of E85, ensuring optimal performance and engine efficiency.
When upgrading fuel lines, it's always advisable to give yourself some breathing room and be realistic about your goals. Planning ahead can save potential headaches and ensure the fuel delivery system is adequately prepared for the intended power levels. Additionally, factors such as pump head, pumping power, and fuel type can influence fuel line sizing, so it's essential to consider the specific demands of your engine setup.
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For 1000 HP on E85, a 10AN feed and 8AN return line is recommended
When it comes to achieving 1000 horsepower on E85 fuel, the recommended fuel line setup is a 10AN feed line and an 8AN return line. This combination ensures an efficient and effective fuel delivery system to support the high-performance requirements.
The feed line, with its larger diameter, allows for an ample fuel supply to meet the demands of the engine. The 10AN feed line is capable of providing a significant volume of fuel, catering to the increased fuel requirements of E85 fuel, which typically needs 30% more fuel to reach stoichiometric conditions compared to other fuels. This ensures that the engine receives an adequate amount of fuel for combustion, supporting the desired horsepower output.
On the other hand, the return line is typically sized smaller than the feed line. The 8AN return line serves the purpose of returning the excess or unused fuel back to the tank. While the return line carries a smaller volume of fuel, it is essential to maintain proper fuel circulation and pressure regulation within the system.
It is worth noting that there are variations in fuel line sizing based on different vehicles and setups. Some sources suggest that a 6AN feed line is sufficient for most turbo builds, and a 6AN return line can also be adequate for certain configurations. However, for the specific goal of achieving 1000 horsepower on E85, the combination of a 10AN feed and 8AN return line is recommended to ensure optimal performance and efficiency.
Planning ahead and sizing fuel lines appropriately is crucial, as mentioned in the Enginebasics article. It is always advisable to give yourself some breathing room and be realistic about your goals. By choosing the right fuel line setup, you can avoid potential headaches and maximize the performance of your vehicle.
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The return fuel line is always sized smaller than the supply line
When it comes to high-performance engines, the size of the fuel line is a critical factor. The fuel supply line must be large enough to accommodate the required fuel flow rate, with the length of the line also playing a role in determining the appropriate size.
In the context of E85 fuel, which demands 30% more fuel to attain stoichiometric conditions, it is recommended to size the fuel lines larger than standard. This is an important consideration for those seeking to achieve significant horsepower, such as 600-750whp or even higher.
Now, let's delve into the specific topic at hand: why the return fuel line is always smaller than the supply line. Firstly, it's important to understand the role of the return line in the fuel system. The return line serves to facilitate the return of unused fuel from the engine back to the tank, ensuring that the fuel pump, which continuously pumps fuel, has an outlet for the excess fuel. This return line helps maintain near-constant pressure at the injectors, regardless of their actual fuel demand.
The reason for the return line being smaller than the supply line is twofold. Firstly, the return line will always flow less fuel because the engine consumes a portion of the supplied fuel for combustion. Secondly, a smaller return line helps to identify it more easily and saves space and costs for the owner. It is worth noting that in carbed applications, the return line is typically the same size as the supply line due to the lower pressure requirements, and any restriction in the return line can lead to an increase in fuel pressure.
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Frequently asked questions
E85 requires 30% more fuel than gasoline to reach a target power level. For this reason, it is recommended to go up to the next bigger fuel line. For instance, an 8AN feed line and 6AN return line are sufficient for a 1000 horsepower gasoline engine, but for an E85 combo, a 10AN feed and an 8AN return minimum are recommended.
A 3/8”id fuel line can easily support 600 HP given sufficient “pump head”. Given a big enough pump, a 3/8” steel line could support 1000 HP.
This depends on the fuel being used. For a 1000 horsepower gasoline engine with 30psi, an 8AN feed line and 6AN return line are sufficient. If you are using a mechanical fuel pump or similar electric pump, you can stick to 8AN lines for both feed and return.
