Common Rail

Peugeot HDi Common Rail

Common Rail Injection System

Peugeot HDi (High-pressure Direct Injection) engines are designed around the revolutionary common rail high pressure injection system. They benefit from the very latest precision engineering and technology to offer outstanding refinement.

The common rail has two functions. First, it generates pressure and stores the fuel under high pressure in a central accumulator rail. Second, injecting the fuel into individual electronically controlled fuel injectors (one per cylinder).

In the injection phase, the common rail uses a ‘pilot injection’ system, which injects a small amount of extremely fine diesel fuel into the combustion chamber before the main quantity of fuel is delivered each cycle. With this steady, regulated delivery of the fuel, mechanical vibration and chassis shudder is reduced, meaning less noise. At the same time, the fuel is burned more effectively, thus reducing emissions and improving economy.