Products Description
A 3 Ohm 3-cylinder CNG/LPG injector rail is used in sequential gas injection systems to deliver gaseous fuel to the engine intake. This red coil injector rail features a 7–12V DC working voltage, 2.4ms opening time and 0.5–2.5 bar working pressure. It is intended for gas conversion applications where the injector resistance, pressure range and ECU control requirements match the selected system.
Product Overview
This 3-cylinder CNG/LPG injector rail is designed for automotive gas injection applications using a compatible electronic control unit (ECU). The injector coil receives control signals from the ECU and operates according to the configured injection timing.
Before selecting an injector rail, confirm the fuel type, engine cylinder count, ECU injector driver compatibility and required gas pressure. These factors are important when replacing an existing injector rail or assembling a CNG/LPG conversion system.
Technical Specifications
| Parameter | Specification |
|---|---|
| Product Type | 3-Cylinder CNG/LPG Injector Rail |
| Coil Type | Red Coil |
| Working Voltage | 7–12 V DC |
| High-Frequency Rate | 167 Hz |
| Coil Resistance | 3 Ohm |
| Opening Time | 2.4 ms |
| Closing Time | 0.9 ms |
| Working Pressure | 0.5–2.5 bar |
| Maximum Pressure | 4.5 bar |
How Does a 3 Ohm CNG/LPG Injector Rail Work?
In a sequential gas injection system, the ECU controls the injector opening and closing according to engine operating conditions. The injector rail is one of the components responsible for delivering gas to the engine intake through the connected injection lines.
The 3 Ohm coil resistance is an important electrical specification. The injector driver circuit must be designed to support the selected injector resistance. A resistance mismatch can cause incorrect current control, injector operation problems or ECU faults.
For system configuration, review the CNG/LPG ECU User Manual and Calibration Guide.
Key Selection Factors
1. Injector Resistance and ECU Compatibility
Confirm that the ECU supports 3 Ohm injectors before installation. Do not select an injector rail based only on its connector or coil color. The injector resistance and ECU driver requirements should match.
2. Working Pressure
The specified working pressure is 0.5–2.5 bar, with a maximum pressure of 4.5 bar. The actual system pressure should remain within the applicable operating range and be configured according to the complete conversion system.
3. Cylinder Configuration
This product is described as a 3-cylinder injector rail. Confirm that the engine and conversion system require a three-cylinder injector configuration before ordering.
4. Injection Timing and Calibration
Injector opening and closing times affect the ECU calibration process. The supplied specifications list an opening time of 2.4 ms and closing time of 0.9 ms. Actual system performance also depends on gas pressure, injector flow characteristics, engine requirements and ECU settings.
Common Questions About 3 Ohm CNG/LPG Injectors
Can I use a 3 Ohm injector rail with a 2 Ohm ECU?
Not automatically. Check the ECU's injector driver specifications first. A 3 Ohm injector should be used with a control system that supports its electrical characteristics. If you are replacing an injector rail, check the original injector resistance and ECU model before ordering.
Why does my engine run rough after switching to gas?
Could be a few things, not necessarily the injector rail itself. Check the gas pressure, injector wiring, ECU calibration and ignition system first. If the problem only happens on gas, compare the petrol and gas fuel trims and check whether the injectors are being controlled correctly.
Can I use this injector rail for both CNG and LPG?
The product is specified for CNG/LPG applications, but the actual installation depends on the gas system pressure, injector flow requirement and ECU compatibility. Confirm the complete system configuration before using it with either fuel.
Is 4.5 bar the normal working pressure?
No. The listed working pressure is 0.5–2.5 bar. The 4.5 bar figure is the maximum pressure specification, not the recommended pressure for everyday operation. Check the system's specified operating pressure before installation.
What should I check if an injector does not open?
Start with the basics: check the connector, wiring, ECU output and coil resistance. Then confirm that the injector is receiving the correct control signal and that the system pressure is within range. Don't keep driving on a suspected faulty gas injector without having the system checked.
Will this injector rail fit every 3-cylinder engine?
No. The cylinder count alone does not guarantee compatibility. You still need to confirm the injector flow requirement, mounting arrangement, gas connections, ECU driver type and operating pressure.
Installation and System Matching
Injector rail selection should be carried out together with the ECU, pressure reducer, gas filter, hoses and other related components. The installation and calibration should be performed by a qualified gas conversion technician.
For practical setup information, refer to the CNG/LPG Injector Rail Installation and Maintenance Guide.
If you are comparing injector rail options for a conversion project, the injector rail selection FAQ explains the information needed to identify a suitable configuration.
Related CNG/LPG Conversion Products
Depending on the vehicle and conversion requirements, the injector rail may be selected together with a compatible ECU kit, pressure reducer and other gas system components.
Explore the available CNG/LPG conversion kits and components to review related product categories.
Product Inquiry
For product selection, please provide the intended fuel type, engine cylinder count, ECU model, required working pressure and target application. These details help determine whether the injector rail matches the proposed CNG/LPG conversion system.
