Components of a Direct Injection gasoline System

Components of a Direct Injection gasoline System

Common Rail System -- A long metal cylinder called a fuel rail distributes fuel to the injectors under extremely high pressure.

Distributor and Inline Pump System -- Either a rotary wheel distributor or plunger-style pump is used to push pressurized fuel to the injectors.

Unit Direct System -- In this setup, the injector and a fuel pump just for that injector are integrated into a single unit and positioned over each cylinder

Advantages over indirect injection:

Better MPG

Leaner fuel mixtures

High power output

Accurately controlled emissions levels

More aggressive ignition timing curves

Precise control over amount of fuel and injection timings

No throttling losses in engines without a throttle plate

Disadvantages:

Dramatic efficiency losses due to deposits on the piston surface.

More deposits on the intake ports and valves.

Low mileage misfire codes.

Gasoline Direct Ignition Engine

•      First, the fuel travels via pump from the fuel tank, through the fuel line and into fuel injectors that are mounted into the engine.

•      The injectors spray gasoline into the air intake manifold, where fuel and air mix together into a fine mist. At precisely timed intervals, intake valves open, corresponding to the different cylinders of the engine.