Powertrain Systems

Delphi Diesel Injectors are precision-engineered for both mechanically and electronically controlled pump line nozzle systems. This range of conventional diesel fuel injectors includes a variety of holder and nozzle combinations for all major engine configurations.

Two major components of the injectors are:

• Nozzle holders for either axial or side fuel feed and available in various ISO outlines, including: 17 mm, 19 mm, and 21 mm outside diameters. They are supplied in traditional high spring configuration or the more modern low spring arrangement. They include:
• Valve spring
• Spindle and⁄or spring seat
• Shim or adjusting cap for spring load adjustment
• Fuel inlet and backleak connections
• Nozzle cap nut
• Mounting hardware
• Nozzle assembly incorporating body and needle valve

Nozzle Options

Multi-Hole Nozzles

• For Direct Injection (DI) engines
• Inject fuel directly into cylinder, with a combustion chamber formed in the top of the piston
• Long Stem Nozzles include:
• Various spray cone angles with injection hole configurations specifically tailored to individual engine requirements
• Outline to ISO standards more commonly with 7 mm or 9 mm diameter shank
• Variety of seat profiles available to suit application requirements
• Sac-Type Nozzles, available with mini-sac or conical sac
• Valve Covered Orifice (VCO) Nozzles that provide low hydrocarbon emissions
• Nozzle hole pre-conditioning and K factor variants
• Long Stem Nozzles are available in two types:
• Standard guide configuration
• Advanced extended guide configuration important where space is limited or extreme injection pressures encountered

Samples of Delphi Direct Injection (DI) Injectors for Diesel Engines

Pintle Nozzles

• For Indirect Injection (IDI) Engines
• Produce a single spray plume that is tailored to match pre-combustion chamber or swirl chamber characteristics
• Long and short stem types available
• Long stem pintle nozzle offers reduced coking and better dynamic performance
• Optional pintaux (pintle⁄auxiliary) hole produces high-velocity spray at a low injection rate for improved cold starting and reduced engine knock at idling

Samples of Delphi Indirect Injection (IDI) Injectors

Benefits

• Extensive portfolio of proven nozzles produced through aggressive technology development efforts and intended to meet virtually any major engine application
• Complete selection of product features that can meet most customer requirements
• Precision-engineered for robust performance and durability
• Responsive, experienced sales and engineering support to help achieve customer satisfaction

Low Spring Injector Features

• Valve spring positioned low in injector body for reduced moving mass
• Holder body types: bar stock or forged construction
• Compact profiles
• Direct Injection (DI) engine and Indirect Injection (IDI) engine versions available
• Range of inlet and backleak configurations
• Outside diameters of more popular holders: range from 17 mm to 25 mm

Low Spring Injector Options

• Designed to help combat engine noise by reducing combustion pressure rise and peak cylinder pressure—without loss of power
• Restricts opening during first stage of operation; injector opens fully during second stage
  
• Injection during second stage occurs at higher pressure and injection rate
• Additional spring and thrust component used to achieve second stage
• Adjustable opening pressures and lifts for custom applications
• Typically used in small, high-speed DI engines (passenger cars, light trucks and vans)

Start-of-Injection Sensor Injectors

• Sensor integrated with control system
• Part of the injection timing feedback loop
• Helps maintain accurate injection timing over the life of the engine by compensating for engine wear

Unit Pump Injectors

• An extension to the low spring injector family
• Specifically tailored for use with electronic unit pump (EUP) at high injection pressures
• Typically installed within cylinder head, connecting to the EUP with a purpose-made high-pressure line⁄connecting tube
• Injectors withstand operating pressures up to 2,000 bar
  

Performance Advantages

Delphi offers a wide range of cost competitive diesel fuel injectors to meet almost any customer requirement. Delphi Diesel Injectors are designed to provide excellent performance and durability while helping manufacturers meet stringent emissions standards and helping optimize fuel economy.

Delphi's flexible engineering approach encourages collaboration. Delphi works with the customer to meet specific design objectives and can provide solutions even for relatively low volume programs.

Delphi Advantage

Delphi offers a wide portfolio of diesel engine management systems and components. Delphi can integrate injection systems, air and fuel management systems, exhaust aftertreatment, and associated electronic controls and sensors to provide complete end-to-end diesel engine control systems that can help manufacturers meet emissions and fuel economy requirements around the world.

Delphi designs and manufactures complete diesel engine management systems for light duty, medium duty and heavy duty applications. Delphi has 15 diesel design and engineering centers located in Europe, Asia, North America and South America, and 21 diesel manufacturing facilities in 13 countries enabling exceptional on-time delivery.