Rajan Wilcox
Fuel injectors are an essential component of an engine, delivering fuel to the cylinders. The size of the fuel injector is critical for performance and tuning control, and choosing the right fuel pump is the first step in the fueling process. This is especially true when it comes to 440 cc fuel injectors, which are commonly used in high-performance engines. Fuel injectors of this size require a fuel pump that can deliver the correct amount of fuel at the right pressure to ensure optimal performance and avoid damage to the engine.
| Characteristics | Values |
|---|---|
| Fuel Injector Flow Rate | 43.5 PSI |
| Fuel Pump | Pierburg Pump |
| Fuel Injector Size | Critical for performance and tuning control |
| Fuel Injector Calculator | FuelTech |
| Fuel Injector Type | Bosch 100% matched |
| Fuel Injector Flow | 440 cc at 3 bar |
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What You'll Learn
Fuel injector flow rates
Most fuel injectors are designed to operate at 36.25 PSI or 43.5 PSI, although some, such as Chrysler and Porsche, use 55 PSI. It is important to note that the fuel pump flow decreases as the pressure goes higher, so ensuring that the fuel pump can provide sufficient flow at the desired pressure is crucial. Additionally, the fuel pressure should be adjusted based on the intake manifold pressure to maintain the advertised flow rate. For example, if the static fuel pressure is set to 43.5 PSI and the manifold pressure rises to 30 PSI, the fuel pressure should be increased to 73.5 PSI.
The Brake Specific Fuel Consumption (B.S.F.C.) is a measure of the projected amount of fuel required to produce one horsepower for one hour. It is used to determine the amount of fuel needed to achieve a desired horsepower. However, determining the exact B.S.F.C. for a specific engine can be complicated and typically requires specialised equipment.
Additionally, it is important to consider the resistance of the fuel injectors, which come in two types: Low (1-5 ohms) and High (12-16 ohms) Resistance. The resistance can be measured using a multi-meter. Other factors that can affect fuel injector performance include contamination of the fuel system, corrosion due to moisture, and particles as small as 10 microns (0.01mm) in the fuel. Regular cleaning and flow testing of the injectors are recommended to maintain optimal performance.
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Fuel injector sizing
The process of fueling injectors starts with selecting the right fuel pump, which is dependent on the horsepower delivery of the engine. The Brake Specific Fuel Consumption (B.S.F.C) is a measure of the projected amount of fuel required to produce 1 HP for 1 hour. This can be used to determine the fuel injector size needed to achieve a desired horsepower. For example, an engine with a B.S.F.C. of .5 will burn 0.5 lbs of fuel to produce 1 HP for one hour.
The fuel injector flow rate is another important factor in sizing. Most fuel injector flow rates are advertised statically at 43.5 PSI, which means that the fuel flow is measured while the injector is fully open and fuel is pumped at a pressure of 43.5 PSI into the atmosphere. To maintain the advertised flow rate, the fuel pressure should be adjusted based on changes in pressure in the intake manifold. For instance, if the static fuel pressure is set to 43.5 PSI and the manifold pressure increases to 30 PSI, the fuel pressure should be raised to 73.5 PSI.
Additionally, the maximum HP supported by an injector is calculated based on flywheel power. If the fuel pressure is not adjusted under boost, the injector will spray less fuel, and if it is not lowered under vacuum, the injector will spray more fuel.
The FuelTech FT600, FT550, FT550LITE, and FT450 engine management systems are capable of controlling a wide range of fuel injector sizes, including the large 850 lb/hr injectors used in high-horsepower applications. These systems also offer features such as sequential injection, ignition, O2 closed loop, Data Logger, and Boost Controller, providing comprehensive control and tuning capabilities for fuel-injected engines.
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Fuel pump selection
Another important consideration is the Brake Specific Fuel Consumption (B.S.F.C.), which refers to the projected amount of fuel required to produce 1 HP for 1 hour. Determining the exact B.S.F.C. for a specific engine can be complex and may require specialised equipment like an engine dyno. Additionally, pumping losses, which are the difference in fuel pressure at the fuel pump exit and the fuel rail exit, should be taken into account. Friction, fuel line inside diameter, and bends in the fuel line can contribute to a pressure difference of up to 4-10 PSI.
When selecting a fuel pump, it is recommended to use tools and calculators provided by reputable companies like FuelTech. Their Fuel Injector Calculator assists in selecting the proper fuel injector sizing for naturally aspirated and turbocharged engines that run on gasoline, alcohol, or ethanol. It allows users to input the number of fuel injectors, estimated horsepower, and the type of induction. Additionally, FuelTech offers engine management systems, such as the FT600, FT550, FT550LITE, and FT450, which provide advanced features like sequential injection, ignition control, data logging, and boost control.
It is also worth noting that when using an upgrade supercharger, the addition of a fuel pump, such as the Pierburg pump, is recommended. This ensures that the engine receives the correct amount of fuel and prevents damage to pistons or valves due to incorrect injection quantities.
Overall, selecting the right fuel pump for 440 cc injectors involves considering flow rates, fuel pressure, B.S.F.C., and potential pumping losses. By using tools and calculators from reputable sources and considering the specific requirements of your engine, you can make an informed decision when choosing a fuel pump that will enhance the performance and tuning control of your vehicle.
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Fuel pressure
Most fuel injector flow rates are advertised at 43.5 PSI. This is the pressure at which the fuel is pumped through the injector into the atmosphere. However, the fuel pressure can vary due to factors such as friction, fuel line inside diameter, and bends in the fuel line. These factors can cause a pressure difference of up to 4-10 PSI between the fuel pump exit and the fuel rail exit.
To maintain the advertised flow rate, the fuel pressure should be adjusted accordingly when the pressure in the intake manifold changes. For example, if the static fuel pressure is set to 43.5 PSI and the manifold pressure increases to 30 PSI, the fuel pressure should be raised to 73.5 PSI.
Additionally, the max horsepower (HP) supported by an injector is calculated based on flywheel power. If the fuel pressure is not adjusted under boost or vacuum, the injector will spray less or more fuel, respectively, which can impact the performance and safety of the engine.
When selecting a fuel pump for 440 cc injectors, it is important to consider the desired horsepower and the duty cycle. By choosing the right fuel pump and maintaining the appropriate fuel pressure, you can ensure that the injectors operate within a safe range and deliver the desired performance.
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Fuel injector control
Fuel Injector Function
Fuel injectors are electronically controlled valves that supply pressurised fuel to the engine. They are designed to open and close rapidly, multiple times per second, allowing fuel to squirt out through tiny nozzles. The nozzles atomise the fuel, creating a fine mist that burns easily. The amount of fuel delivered to the engine is determined by the duration the injector remains open, known as the pulse width.
Engine Control Unit (ECU)
The ECU is the brain of the fuel injection system. It monitors various sensors and parameters to calculate and control the pulse width of the fuel injectors. The ECU ensures that the fuel rate increases when the throttle valve opens, preventing hesitation or a lack of fuel when the gas pedal is pressed.
Multi-Port Fuel Injection Control
Multi-port fuel injection systems can operate in two main ways. The first is where all the injectors open simultaneously. The second is sequential multi-port fuel injection, where each injector opens just before its corresponding intake valve, allowing for quicker response to driver input.
Fuel Pressure and Flow Rate
Maintaining the correct fuel pressure is critical for accurate fuel delivery. The advertised flow rates for fuel injectors are typically given at a static pressure of 43.5 PSI. To maintain the desired flow rate, the fuel pressure must be adjusted based on changes in intake manifold pressure. For example, if the static pressure is 43.5 PSI and the manifold pressure increases to 30 PSI, the fuel pressure should be raised to 73.5 PSI.
Brake Specific Fuel Consumption (BSFC)
BSFC represents the projected amount of fuel required to generate one horsepower for one hour. It helps determine the necessary fuel pressure and injector pulse width to achieve the desired horsepower. While determining the exact BSFC for a specific engine is complex, it plays a crucial role in fuel injector control.
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Frequently asked questions
The safe limit for 440 cc injectors is 228 max hp.
The Pierburg pump is recommended for 440 cc injectors.
The flow rate of 440 cc injectors is 440 cc/min at 3 bar.
The resistance of 440 cc injectors is 12-14 ohm.
