Td5 was a massive step forward from Tdi, but the wholly different TDV6 system brought petrol engine standard 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 a common rail to injector which is energized by integral piezo actuators which react thirty times faster than solenoid injectors. Pizeo crystal beform when an electrical current is applied, and this movement operates the injector.
Injector is in two stages a pilot does, followed by a main injection which helps control the burn and thereby reduce combustion noise diesel rattle. A lower 17.3 compression ratio future reduces noise and heat, and improves the burn to give lower fuel consumption and emissions. Fuel is injected at up to 1650bar. To future improve combustion; each cylinder has two inlet ports, a swirl port for low load efficiency, and high volume port.
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