Rajan Wilcox
Flex fuel injectors are designed for the use of gasoline and gasoline mixtures. They are different from non-flex injectors in that they are shorter and have different connectors. The use of flex fuel can clean injectors by scouring and scrubbing deposits out of a fuel system. This cleaning effect will normally not be a problem and will keep every fuel system component clean. Ethanol, a common component of flex fuel, is mildly acidic and can accelerate corrosion. However, the use of E85, a type of flex fuel, is believed to offer more maximum power due to its cooling effects.
| Characteristics | Values |
|---|---|
| Flex fuel injector design | Designed for gasoline and gasoline mixtures |
| Shorter than non-flex injectors with a different connector | |
| Flex fuel injector cleaning | Ethanol in flex fuel cleans the fuel system, including injectors |
| Ethanol can also cause corrosion | |
| Flex fuel injector performance | Flex fuel can offer more maximum power due to the cooling effects of E85 |
| Flex fuel injectors are rated at 28 lbs vs 17 lbs for non-flex |
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What You'll Learn
Ethanol's corrosive nature can damage injectors
Ethanol is a highly polar organic molecule that is completely soluble in water. Its structure and behaviour differ from traditional hydrocarbon fuels that contain numerous organic molecules. This difference in composition leads to unique challenges in handling, storage, usage, and performance when compared to conventional fuels.
Ethanol's corrosive nature stems from its mildly acidic properties. Acids are known to accelerate corrosion, and when ethanol comes in contact with oxygen during transportation and storage, it reacts with it to form additional acidic compounds. This combination of factors enhances the corrosive effect, leading to issues in fuel pump and injector components.
The affinity of ethanol for water further exacerbates the problem. Ethanol is hygroscopic, which means it attracts and absorbs water moisture from the atmosphere. This absorbed water, in combination with the acidic compounds, can lead to corrosive wear and tear on fuel injectors.
The issues caused by ethanol's corrosive nature are particularly pronounced in the marine industry. The presence of ethanol in fuel systems can lead to deposits of varnish, gum, and sludge being lifted and held in suspension. These deposits can then make their way to the fuel filter, the injector's microfilter, and the injectors' valves, potentially choking off the engine's fuel supply. This can result in clogged and sticky fuel injectors, requiring costly repairs and replacements.
To mitigate these issues, ethanol corrosion inhibitors have been developed. These inhibitors are designed to protect ferrous metals commonly found in fuel systems and provide pHe buffering to control acidity levels, thereby reducing the corrosive impact of ethanol.
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Flex fuel injectors are shorter and have different connectors
Flex fuel injectors are different from their gas-engine counterparts in several ways. One of the most notable differences is that flex fuel injectors are shorter and have different connectors. This distinction is important because it affects the compatibility of these injectors with other engine components, particularly those from GEN IV trucks, which are typically taller. The unique connector harnesses of flex fuel injectors, which may include distinct features like a green clip and a grey harness body, further set them apart.
The length and connector variations between flex fuel and gas injectors are not the only differentiating factors. The materials used in their construction also differ significantly. Flex fuel injectors are crafted from stainless steel and plastic compounds, chosen for their ability to resist the corrosive nature of ethanol. In contrast, gas engine injectors are often made from aluminium or composite materials, which are compatible with gasoline but susceptible to corrosion when exposed to ethanol.
The flow rate and calibration of flex fuel injectors also deviate from those of gas injectors. Flex fuel injectors are designed to deliver a higher flow rate, catering to the higher energy content of ethanol. Conversely, gas injectors are calibrated for gasoline and offer a lower flow rate. Employing a gas injector in a flex engine can result in a lean fuel mixture, leading to engine damage and diminished performance.
It is worth noting that flex fuel injectors are specifically engineered to handle ethanol blends, catering to the unique requirements of flex engines. Flex engines, also known as flexible fuel vehicles (FFVs), are designed to run on a blend of gasoline and ethanol, with ethanol concentrations ranging from 0% to 85% (E85). This versatility in fuel type offers environmental benefits and potential cost savings, making flex engines an increasingly popular choice.
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E85 conversion kits can optimise fuel injection
E85 conversion kits are a popular choice for those seeking an economic power boost for their vehicles without breaking the bank or getting tangled up in extensive modifications. E85 is up to 85% ethanol, a renewable fuel produced from plant biomass like corn, which absorbs carbon dioxide from the atmosphere as it grows, resulting in reduced lifecycle emissions compared to fossil fuels.
E85 conversion kits allow gasoline vehicles to run on ethanol as an alternative fuel. They are installed as a plug-and-play device in the vehicle's fuel injection system by rerouting the signal from the ECM to the fuel injectors. The eFlexFuel E85 capability kit, for example, takes control of the fuel injection process to make it optimal for E85. It comes with an ethanol sensor that connects to the vehicle's fuel line and monitors the ethanol content in the fuel. The sensor adjusts the fuel injector signals in real time based on the data sent to the ECM.
The stock fuel system of a vehicle often lacks the flow capacity to run full E85, and it must be blended with gas. However, with an E85 conversion kit, the fuel blend can be monitored through an app that warns when the limits of the injectors are reached.
Converting to E85 requires minimal fuel system changes, although this may vary depending on the vehicle. For example, 15-17 Mustang owners can run E85 on their stock fuel injectors without any issues, while a 2018-2019 or 2020 Coyote Mustang will require a minimum of 47-lb E85 injectors.
E85 conversion kits not only improve a vehicle's performance but also reduce harmful emissions by up to 35-80% compared to gasoline.
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E85 can clean fuel lines and old gas deposits
E85 is a type of flex fuel that contains up to 83% ethanol. Ethanol is a corrosive substance that is mildly acidic and has an affinity for water. While ethanol is often confused with highly corrosive methanol, it is generally safe for vehicles manufactured in 1994 or later. Since 1994, it has been US federal law that vehicles must be compatible with ethanol.
E85 is a good cleaner that can clear the engine, fuel lines, and fuel injectors of deposits. It can scour and scrub varnish, gum, sludge, and dirt deposits out of a fuel system. The deposits will be held in suspension in the ethanol fuel and will eventually wind up in the fuel filter, keeping the fuel system components clean. This can prevent the choking off of an engine's fuel supply, which can occur when deposits are held in suspension in regular gasoline.
However, E85 does not dissolve dirt, so it will not reduce the load on the fuel filter. Additionally, it will not clean the valves on certain older direct-injection cars. It is important to note that E85 should only be used in vehicles that are rated to accept it, as using it in non-compatible vehicles can lead to serious engine damage.
To ensure compatibility, it is recommended to use an eFlexFuel E85 compatibility kit, which takes control of the fuel injection process and optimizes it for E85. The kit also includes an ethanol sensor that monitors the ethanol content in the fuel and adjusts the fuel injector signals accordingly.
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Flex fuel vehicles have ethanol-resistant fuel injectors
Flex fuel vehicles, also known as FFVs, are automobiles that are designed to run on a blend of gasoline and alternative fuels, such as ethanol. These vehicles have engines that can operate with varying combinations of gasoline and ethanol, allowing drivers to choose the fuel type they prefer or that is most readily available.
The engine in a flex-fuel vehicle is designed with modifications to handle higher ethanol content. Ethanol has a higher-octane rating than gasoline, meaning it has better resistance to knocking or pre-ignition. Therefore, flex-fuel engines often have higher compression ratios, modified cylinder heads, and stronger components to withstand the demands of ethanol combustion. To address the challenge of starting in cold weather conditions, flex-fuel vehicles may have additional features like an electric fuel heater or an auxiliary gasoline fuel system. These systems help ensure easy starting and smooth operation in colder climates.
Flex-fuel vehicles have a modified fuel system that can accommodate different fuel blends. The fuel tank, fuel lines, and fuel injectors are made of materials that are resistant to corrosion caused by ethanol. Additionally, the fuel pump and the engine control system are specially calibrated to handle different fuel mixtures. This includes the ability to adjust fuel injector signals in real time based on the ethanol content in the fuel.
Ethanol is mildly acidic, and acids accelerate the corrosion process. Ethanol’s affinity to water adds to its corrosive nature, particularly with steel/iron alloys. However, the ethanol-resistant materials used in the fuel system of flex-fuel vehicles, including the fuel injectors, help to prevent corrosion and keep the fuel system clean.
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Frequently asked questions
Flex fuel is a mixture of gasoline and ethanol.
Yes, flex fuel will clean your gas injectors. Ethanol has a cleaning effect on fuel systems, removing varnish, gum, sludge, and dirt deposits. However, ethanol is also corrosive and can cause serious damage to pipelines.
Yes, flex fuel injectors are shorter and have different connectors.
No, using non-flex injectors in a flex fuel vehicle or vice versa would require computer tuning.
