Powertrain Systems

Delphi Multec^® Gasoline Direct Injection Fuel Rails are integrated, pre-assembled conduits that transfer fuel from a vehicle's high pressure fuel pump and distribute it to each fuel injector location on the engine.

Constructed of stainless steel for superior durability and corrosion protection, Delphi Multec GDi Fuel Rails offer a number of design advantages. Delphi offers configuration alternatives to enable efficient packaging and optimal program integration for the manufacturer.  Delphi's damping technology and orifice designs reduce port-to-port fueling variation and fuel line noise.  Delphi Multec GDi Fuel Rails deliver superior performance simultaneously with low cost.

Delphi Multec GDi Fuel Rails are supplied preassembled with Delphi Multec^® Fuel Injectors and a high pressure sensor.  They are leak tested prior to delivery to reduce the need for engine-level leak testing by the manufacturer.

Benefits

• Stainless steel construction provides superior durability and prevents corrosion with all approved market fuels.
• Stainless steel construction and the use of an O-ring only at the injector interface contribute to reduced evaporative emissions.
• Available with either an overhead conduit or an offset conduit for flexible program integration.  In the overhead conduit design, the main conduit is positioned directly above the injector sockets.  In the offset conduit design, the injector sockets are positioned to the side of the main conduit. 
• Robust to ethanol fuel blends (0 to E100) and methanol fuel blends (including M15) for 15 years/150,000 miles based on severe temperature and vibration test schedules.
• Each rail design is unique and optimized to meet the customer's specific application requirements.
  

Typical Applications

Delphi Gasoline Direct Injection Fuel Rails are suitable for use with homogeneous and stratified mode direct injection gasoline and flexible fuel engines, ranging from one- to 12-cylinders.

Performance Advantages

Delphi Gasoline Direct Injection Fuel Rails are designed to reduce fuel system-generated noise.  For example, the rails can be isolated from the head.  This reduces energy transfer from the rail to the head through the connection point.

Delphi engineers use math modeling to determine the proper size of the orifice for each application.  Inputs include the fuel rail, high pressure pump, spill valve, system control and fuel lines.  Delphi's engineering process is capable of predicting fuel pressure and flow rate at any point in the system and response time of the valves.

Delphi has manufactured stainless steel fuel rails for more than 25 years and we have provided our customers with excellent warranty performance.  In addition, Delphi's fuel rails have provided excellent first-time quality.

Delphi's high volume business and global presence provides manufacturers with the benefits of a varied customer base and diverse operating environments.  With its extensive experience in fuel rail design and manufacturing, Delphi understands the fuel rail environment and validation requirements.  Delphi conducts all testing in-house using its own laboratories and state-of the-art tools for fuel rail design, testing and validation.  Delphi investigates fuels worldwide and has developed aggressive formulations for ethanol and methanol blends and worst-case scenarios as required for validation testing.

Pressure Pulsation Simulations
 

 

This chart demonstrates Delphi's capability for simulating pressure pulsation to choose the proper fuel rail orifice for individual GDi program applications.  (Note: Pressure values obtained from time-resolved rail pressure simulation data.) 

The Delphi Advantage

With extensive experience in engine management systems development, Delphi provides vehicle manufacturers with unique systems-level knowledge and analysis capabilities.  Delphi has a thorough understanding of automotive markets around the world and a long history of supplying gasoline engine management products throughout the world.  Delphi has a global network of resources and is positioned to respond quickly and efficiently with localized component manufacturing facilities and local market calibration expertise.

Delphi offers a complete engine management systems product portfolio, including: fuel injection systems, ignition systems, air and fuel management, electronics, sensors and actuators, valve train systems, fuel handling systems and evaporative emissions systems.