Katerina Swanson
The number of fuel injectors in a Hemi engine depends on the make and model of the vehicle. For example, the stock fuel injectors on a 2009 5.7L Hemi are 26 lbs, while the stock SRT 6.1L injectors are 30 lbs. The Dodge Ram 1500 with a 5.7 Hemi engine has injectors with 4 holes, while the injectors on a 2006 Chrysler 300c Hemi 5.7 are rated at 30 lb/hr.
| Characteristics | Values |
|---|---|
| Fuel Injector Ratings | 30 lbs, 34.5 lbs, 36 lbs, 52 lbs |
| Fuel System Pressure | 48 psi, 55-58 psi |
| Fuel Pump Flow Rate | 175 liters per hour or 46 gpm |
| Fuel Injector Brands | FIC, Deatschwerks, NGK iridium, NGK copper, OEM Champion |
| Fuel Injector Sizes | 5.7L, 6.1L, 6.4L |
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What You'll Learn
Injector ratings for a Dodge Ram 1500 with a 5.7 hemi engine
The Dodge Ram 1500 with a 5.7L HEMI engine uses fuel injectors with a static flow rate of 300cc/min, 28.5lbs/hr, and a resistance of 12.5 Ohms. These injectors have a convex, 4-hole fuel nozzle design for maximum atomization and feature Viton O-rings with an upper and lower diameter of 14.5 mm. The stock fuel system pressure for the 5.7L HEMI engine is 58 psi ± 5 psi, and the stock fuel injectors are rated at 26 lbs.
It is important to note that the injector ratings and specifications can vary depending on the model year of the Dodge Ram 1500. For example, the 2003 model year has a unique fuel system pressure of 48 psi, while the 2004 and newer models use a pressure of 58 psi. The injector ratings and specifications can also be influenced by other modifications made to the engine, such as the addition of a supercharger or changes in engine displacement and horsepower rating.
When considering injector ratings, it is essential to match the injector size and flow rate to the specific engine requirements. While larger injectors may seem advantageous, it is crucial to select the right size for the application. Oversized injectors can cause various problems, including delivering too much fuel to the engine. Therefore, it is recommended to consult with a professional or refer to a fuel injector worksheet to calculate the required injector size based on the engine modifications and performance goals.
Additionally, it is worth mentioning that the factory-spec injectors are generally suitable for most bolt-on modifications. However, if you are planning significant engine upgrades, such as increasing the engine displacement to 6.1L or adding a supercharger, you may need to consider upgrading the fuel injectors accordingly. It is always advisable to refer to the manufacturer's recommendations and seek advice from experienced mechanics or Dodge Ram forums to ensure the optimal injector ratings and specifications for your specific Dodge Ram 1500 with a 5.7L HEMI engine.
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Injector flow rate and fuel system pressure
The injector flow rate is based on the effective pressure, which is the pressure differential across the injector. Effective pressure is influenced by the vacuum in the intake manifold when the engine is idling, which pulls fuel out of the injectors, increasing the pressure. Conversely, in a supercharged or turbocharged vehicle, the pressure inside the manifold pushes fuel back into the injector, reducing the effective fuel pressure.
The injector flow rate is calculated using the fuel pressure and duty cycle at mean sea level. The amount of fuel an injector can flow is typically measured in pounds per hour, with most manufacturers specifying a standard operating pressure of 43.5 psi, although Ford rates its injectors at 39.5 psi. Injector flow rate recommendations are calculated assuming a base fuel pressure of 3 Bar (43.5 psi) and a maximum injector duty cycle (IDC) of 80%.
The fuel system pressure for a Hemi engine can vary depending on the model year and displacement. For example, the stock fuel system pressure for a 2003 Dodge Ram 1500 with a 5.7 Hemi is 48 psi, while the 2004 and later models use 58 psi. The fuel pressure for the 2013 5.7L Eagle Hemi is also specified at 58 psi, with fuel injectors rated at 34.5 lb per hour.
It is important to note that the injector flow rate can be altered by defects in mechanical components or changes in the injector duty cycle due to incorrect sensor input. For example, a stuck pressure regulator can increase fuel rail pressure at idle, leading to increased injector output volume. In such cases, the PCM may reduce injector flow by adjusting the injector pulse width.
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Injector size and horsepower
The size of a fuel injector is critical for performance and tuning control. The horsepower requirements determine the size of the injector. For example, a 2013 5.7L Eagle Hemi has a fuel pressure of 58 psi and injectors rated at 34.5 lb per hour. Its stock injectors will support 475 to 485 whp. Similarly, stock fuel injectors on a 2009 5.7L Hemi are 26 lbs, while the stock SRT 6.1L injectors are 30 lbs.
The size of the injector is directly proportional to the horsepower. For instance, a 5.7 Hemi with a supercharger running 8 lbs boost only needs 50 lb injectors. Even the 30 lb injectors for the 6.1 Hemi will work for modifications up to 450 HP.
It is important to note that bigger injectors are not always better. The right size for the application is always the best choice. For example, a 52 lb injector is way oversized for a naturally aspirated engine (V8).
To determine the injector size, one must multiply the flow rate by the number of injectors and then divide that by the engine's BSFC number. For example, with a V8 engine, we multiply 42 lb/hr x 8 = 336 lbs/hr and divide by 0.5 BSFC = 672 horsepower.
Additionally, a 70% duty cycle safety margin is considered to ensure the injectors are adequately sized.
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Injector brand and spark plugs
HEMI engines are fuel injected and have a variety of injector options available. The number of fuel injectors a HEMI engine requires depends on the engine size. For example, a 5.7L HEMI engine has eight fuel injectors, while a 6.4L HEMI engine has 16 fuel injectors.
Injector Brands
When it comes to choosing an injector brand, there are several reputable options available. Here are some of the top brands known for their quality and performance:
- Fuel Injector Clinic (FIC): Renowned for their high-performance fuel injectors, FIC offers a wide range of injectors compatible with various fuels, from pump gasoline to race fuels. Their products are known for precision, customization, and a passion for pushing engines to their limits.
- DeatschWerks: Specialising in high-performance fuel injection solutions, DeatschWerks is a leading brand known for quality, innovation, and custom-tailored performance. Their injectors are engineered to meet the demands of high-horsepower applications, making them a top choice for those seeking extreme performance.
- Ford Performance: Backed by decades of engineering achievements and motorsport success, Ford Performance is a trusted brand among professional racers and dragstrip legends. Their injectors are designed to exceed standards and deliver reliable results.
- Bosch: Bosch is a well-known brand that offers new injectors through its authorised resellers. Their fuel injection components are designed for specific applications and are intended to meet precise requirements.
- BBI: BBI is a highly respected brand in the diesel injector market, known for their quiet and powerful injectors.
It is important to choose injectors that are compatible with your specific engine and application. Some brands, such as Advanced Fuel Dynamics, offer different injector options depending on your horsepower goals and engine specifications.
Spark Plugs
When it comes to spark plugs, there are several options available for HEMI engines. Here are some recommendations:
- NGK Iridium: NGK offers iridium-tipped spark plugs that are known for their performance and longevity. They are available for various HEMI engines, including the 5.7L and 6.4L variants.
- Champion Copper Plus: Champion's copper spark plugs are a popular choice among HEMI owners. They are known for their conductivity properties and are recommended for use every 30,000 miles.
- Automate Double Platinum: These spark plugs are a more affordable option, offering decent performance and value for money.
- Autolite Double Platinum: Similar to Automate, Autolite offers double platinum spark plugs at a reasonable price, providing a good balance between cost and performance.
When choosing spark plugs, it is important to consider the heat range and compatibility with your specific HEMI engine. Adjusting coolant temperature settings and installing a lower threshold coolant temperature sensor can also impact the performance of your spark plugs.
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Injector upgrades
When considering injector upgrades, it's important to match the injector size and flow rate to your engine's fuel requirements. Bigger injectors do not always mean better performance, and it's crucial to select the right size for your application. Injectors that are too large can cause various problems, including delivering too much fuel to the engine. Therefore, it is essential to carefully calculate the required injector size based on your engine's specifications.
For example, if you have a 2009 5.7L Hemi, the stock fuel injectors are 26 lbs. If you are planning modifications, you may need to upgrade to larger injectors. The 6.1L rated injectors (30 lbs) are a common upgrade for this engine, as they can support up to 450 HP. However, it's important to note that you will also need a tune to take full advantage of these upgrades, as the stock tune may not be able to self-adjust to the increased air flow and fuel volume.
If you have a supercharged or stroked Hemi, you may require even larger injectors to provide the additional fuel needed by your engine. For example, the Fuel Injector Clinic offers a range of high-performance injectors for the Dodge Hemi SRT-8, 5.7, with flow rates up to 240 lbs/hr at 58 PSI fuel pressure. Injector Dynamics also offers a 1300cc injector for the Dodge/Chrysler Hemi engines, providing a significant increase in fuel delivery.
When choosing injector upgrades, it's important to consider the fuel system pressure and flow rate, as well as the engine's displacement and horsepower rating. It's always recommended to consult with professionals or seek advice from reputable sources to ensure that you select the appropriate injectors for your specific Hemi engine and performance goals.
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Frequently asked questions
Hemi is short for hemispherical combustion engine.
The number of fuel injectors in a Hemi depends on the model. A 5.7L Hemi has 26 lbs stock fuel injectors, while a 6.1L Hemi has 30 lbs stock injectors.
Upgrading the fuel injectors in a Hemi can improve fuel efficiency, as larger injectors can flow more fuel and increase horsepower.
Advanced Fuel Dynamics offers FIC and Deatschwerks fuel injectors for Hemi engines.
Yes, it is important to ensure that the fuel injectors are properly rated for the engine. Upgrading to larger injectors may require additional modifications, such as a higher-flow fuel pump, to maintain proper fuel pressure.
