Ameer Randolph
Harley-Davidson's Screamin' Eagle High-Flow Injector Kit is designed to optimise air/fuel flow and velocity in Milwaukee-Eight engines. The kit includes a large-capacity throttle body, port-matched aluminium intake manifold, and intake seals. It is compatible with Original Equipment or High-Flow Injectors. However, it is important to note that the stock injectors may not be sufficient for high-performance engines, and larger injectors may be required to support additional horsepower. Proper injector sizing is crucial to ensure optimal engine performance and fuel efficiency.
| Characteristics | Values |
|---|---|
| Fuel Injector Kit | Screamin' Eagle High-Flow Injector Kit - Milwaukee-Eight Engine (5.5 G/Sec) |
| Displacement | 1,868cc |
| Fuel Consumption | 6.1 l/100km |
| Weight | 363 kg |
| Year | 2024 |
| Horsepower | 93 HP |
| Fuel Type | 91 octane (95 RON) or higher fuel (R+M)/2 |
| Fitment | Fits '09-later Touring models (except Road Glide and models with fairing lowers) |
| Throttle Body | Screamin' Eagle High Flow 64mm EFI Throttle Body - Milwaukee-Eight Engine |
| Injector Size | 5.5gm |
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What You'll Learn
The compatibility of Screamin' Eagle fuel injectors with stock throttle bodies
Screamin' Eagle, a brand associated with Harley-Davidson, offers a range of high-performance fuel injectors and throttle bodies for various Harley-Davidson motorcycle models. The compatibility of these fuel injectors and throttle bodies with stock components can vary depending on the specific model and engine configuration.
In general, Screamin' Eagle fuel injectors are designed to work with specific Screamin' Eagle throttle bodies as part of their performance kits. For example, the Screamin' Eagle High-Flow Injector Kit for the Milwaukee-Eight engine is designed to match the increased air velocity and fuel delivery demands of the engine when equipped with big bore cylinders, ported heads, and a larger throttle body. This kit is intended for specific '18-'24 Softail and '17-later Touring models equipped with Screamin' Eagle Milwaukee-Eight Stage IV kits.
Similarly, the Screamin' Eagle High-Flow 64mm EFI Throttle Body for the Milwaukee-Eight engine is designed to pass more air and fuel mixture into the engine and can be used with original equipment or high-flow injectors. It is compatible with specific '18-later Softail and '17-later Touring models equipped with Screamin' Eagle Milwaukee-Eight Stage IV kits.
It is important to note that proper installation and calibration are crucial for the optimal performance and safety of the engine. Harley-Davidson recommends referring to the motorcycle owner's manual and seeking assistance from authorized dealers for specific compatibility information and installation requirements.
Additionally, when considering compatibility, it is essential to choose the appropriate fuel injector size for the specific engine and performance requirements. Increasing the injector size may be necessary when the engine's horsepower capacity exceeds that of the stock fuel injectors. However, using an injector that is too large can cause low RPM drivability and tuning issues.
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The advantages of using Screamin' Eagle fuel injectors
The high-flow injectors are standard equipment in the Milwaukee-Eight® Stage IV Kits, providing fuel delivery at a rate of 5.5 grams/second, which is 24% more than the Original Equipment injectors. This means that the injectors can support additional horsepower above what the stock injector is able to deliver.
The Screamin' Eagle fuel injectors are also designed to optimize air/fuel flow and velocity, building on the previous generation of CNC-Ported Milwaukee-Eight® Cylinder Heads. This means that the injectors can help to improve the performance of the engine, delivering maximum horsepower and leaving other riders in the dust.
Additionally, the Screamin' Eagle fuel injectors are 50-State U.S. EPA compliant for sale and use on all applicable vehicles, including those that are pollution-controlled. This is an advantage for riders who want to ensure they are using compliant products.
Finally, the Screamin' Eagle fuel injectors are designed for experienced riders who demand no-compromise performance. The product delivers on this promise by providing the most displacement and power ever created by Harley-Davidson for a street-compliant crate performance engine.
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The disadvantages of using Screamin' Eagle fuel injectors
The Screamin' Eagle High-Flow Injector Kit is designed for Harley-Davidson Milwaukee-Eight engines. While these fuel injectors offer certain benefits, there are also some disadvantages to using them. Here are some of the key disadvantages:
- Compatibility and Restrictions: The Screamin' Eagle fuel injectors are designed specifically for Harley-Davidson motorcycles and may not be compatible with other motorcycle brands or models. Additionally, motorcycles modified with some Screamin' Eagle performance products, including these injectors, are restricted from being used on public roads and may be limited to closed-course competition. These restrictions can limit the usability of the injectors for those who intend to use their motorcycles for everyday riding on public roads.
- Performance Tuning: While the high-flow injectors are designed to optimize air/fuel flow and velocity, they require proper tuning for correct installation. Failure to properly tune the injectors may result in engine damage. This means that riders need to have a good understanding of engine tuning or seek professional assistance, adding to the overall cost and complexity of the installation process.
- Fuel Requirements: The Screamin' Eagle High-Flow Injector Kit recommends the use of 91 octane (95 RON) or higher fuel. This may result in increased fuel costs for riders, especially in regions where higher octane fuel is more expensive or less readily available.
- Size and Performance: While larger fuel injectors are necessary to support additional horsepower, using injectors that are too large can cause low RPM drivability and tuning issues. This is because, at excessively low duty cycles, you lose resolution on the injector when tuning. Therefore, it is crucial to select the appropriate injector size for your specific engine and performance requirements.
- Geographical Restrictions: While the injectors are 49-state U.S. EPA compliant, they are not compliant for sale or use in California on pollution-controlled motor vehicles. This is due to California's guidelines on tampering, which can result in substantial fines and penalties. As a result, riders in California may need to explore alternative options that comply with the state's regulations.
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The process of installing Screamin' Eagle fuel injectors
The installation process for the Screamin' Eagle High-Flow Injector Kit involves several important steps to ensure proper function and avoid engine damage. Here is a detailed guide on the process of installing the fuel injectors:
- Purchase the Kit: The Screamin' Eagle High-Flow Injector Kit can be purchased from authorized Harley-Davidson dealers or online stores. The kit includes the fuel injectors and other necessary components for installation.
- Vehicle Compatibility: Before starting the installation, ensure that your vehicle is compatible with the Screamin' Eagle High-Flow Injector Kit. The kit is designed for specific Harley-Davidson models, such as the Milwaukee-Eight Engine and Touring models. Refer to the kit's fitment information or consult a dealer to confirm compatibility.
- Prepare the Vehicle: Park the vehicle on a level surface and ensure it is securely supported. Refer to the motorcycle owner's manual for any specific preparation instructions.
- Disconnect the Battery: Disconnect the negative battery cable to prevent any accidental electrical shorts during the installation process.
- Remove the Stock Fuel Injectors: Carefully remove the stock fuel injectors by following the vehicle's service manual or seeking guidance from a qualified technician. This process may involve disconnecting electrical connectors, fuel lines, and other components.
- Clean the Intake Ports: Before installing the new fuel injectors, it is essential to clean the intake ports and ensure there is no debris that could obstruct the fuel flow.
- Install the Screamin' Eagle Fuel Injectors: Install the new Screamin' Eagle fuel injectors by following the kit's instructions or seeking guidance from a technician. Ensure proper seating and secure all connections.
- Reconnect the Battery: Reconnect the negative battery cable once the installation is complete.
- Calibrate the ECM: Proper installation requires calibrating the Engine Control Module (ECM) with a Screamin' Eagle Pro Street Tuner or dealership-installed Screamin' Eagle calibration. This step is crucial to ensure optimal performance and avoid a lean fuel condition, which could damage the engine.
- Test the Vehicle: After installation and calibration, start the engine and check for any leaks or unusual noises. Take the vehicle for a test ride to ensure it performs as expected.
- Maintenance and Care: Regularly inspect the fuel injectors and related components for any signs of wear or damage. Follow the recommended maintenance schedule provided by Harley-Davidson to ensure the long-term performance and reliability of your vehicle.
It is important to note that the installation process may vary slightly depending on your specific vehicle model and the kit purchased. Always refer to the official Harley-Davidson resources, such as the owner's manual and dealer instructions, for the most accurate and up-to-date information.
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The cost of Screamin' Eagle fuel injectors
The cost of the Screamin' Eagle High-Flow Injector Kit is not readily available. However, Harley-Davidson offers free shipping for members on orders over $50, and members also get points for purchases and access to the H-D App.
The Screamin' Eagle High-Flow Injector Kit is designed to match the increased air velocity and fuel delivery demands of the Milwaukee-Eight® engine equipped with big bore cylinders, ported heads, and a larger throttle body. It delivers fuel at a rate of 5.5 grams/second, which is 24% more than the Original Equipment injectors.
The kit is standard equipment in the Milwaukee-Eight® Stage IV Kits and is designed to optimize air/fuel flow and velocity. It is intended for experienced riders only.
The Screamin' Eagle High-Flow 64mm EFI Throttle Body is also available, which is standard equipment in the Milwaukee-Eight® engine Stage IV Kits. This throttle body can be used with Original Equipment or High-Flow Injectors. The prices listed for this product are the Manufacturer's Suggested Retail Prices for base models, and options such as color are available at an additional cost.
It is important to note that prices listed by Harley-Davidson exclude tax, title, licensing, registration fees, destination charges, surcharges, added accessories, and additional dealer charges, and are subject to change.
One source mentions that going with a 64 and injectors means spending $1000 for a couple of HP.
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Frequently asked questions
Yes, you can fit Screamin' Eagle fuel injectors into a stock throttle body. The Screamin' Eagle High-Flow Injector Kit is designed to match the increased air velocity and fuel delivery demands of the Milwaukee-Eight® engine. It is intended for experienced riders only.
The Screamin' Eagle High-Flow Injector Kit is designed to be used with the Milwaukee-Eight® engine equipped with big-bore cylinders, ported heads, and a larger throttle body. It provides a fuel delivery rate of 5.5 grams/second, which is 24% more than the Original Equipment injectors.
The kit is compatible with '18-'24 Softail and '17-later Touring models (excluding '23-later FLHXSE and FLTRXSE, '24-later FLHX, FLTRX, and FLTRXSTSE, and '25-later FLHXU and FLTRXRRSE) equipped with Screamin' Eagle Milwaukee-Eight Stage IV kits.
Yes, all models require ECM calibration with the Screamin' Eagle Pro Street Tuner or dealership-installed Screamin' Eagle calibration for proper installation.
