TD5 was a massive step forward from TDI, but the wholly different TDV6 system brought petrol engine standards of smoothness, quietness and power. It reverts to an engine mounted, now belt driven, high pressure injector pump, fed by an in tank lift pump.
Pressurized fuel is supplied via common rail piezo actuators which react thirty times faster than solenoid injector. Piezo crystals deform when an electrical current is applied, and this movement operates the injector.
Injection is in two stages a pilot dose, followed by a main injection which helps control noise diesel rattles. A lower 17.3.1 compression ratio further reduces noise and heat, and improves the burn to give lower duel consumption and emissions. Fuel is injected at up to 1650bar (24,000psi).
To further improve combustion, each cylinder has two inlet ports, a swirl port for low load efficiency, and a high volume port. In place of the conventional stop solenoid to shut off the fuel supply, the TDV6 engine is stopped by the ECM cutting the electrical supply to the piezo actuators in the injectors.
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