Behind Bars
A high-pressure secondary fuel pump delivers fuel to the fuel rails at a pressure of up to 1650 bar (24,250psi). When the engine is stopped, the system's pressure is depleted within seconds, making the system pressureless.

Hair Trigger
Each fuel injector has six orifices, each with a diameter of 145 microns, through which fuel is injected into the combustion chamber. At 145 microns, each orifice is as thick as a human hair and able to provide an extremely fine spray of diesel fuel to ensure uniform air-fuel mixture and complete combustion process.

Same as Your Colour Printer
The Jaguar 2.7-litre V6 diesel engine uses six piezo injectors - so what's a piezo? Piezo stacks belong to the family of multi-layer ceramic components, which use the inverse piezoelectric effect discovered by Curie and Lippmann in 1881. If a voltage is applied to a piezoelectric crystal, its dimensions change. This single effect cannot be exploited.

However, when several piezoelectric elements are superimposed, the 'stack' becomes extremely useable. Therefore, made up of multiple thin ceramic layers, the length of the piezo stack increases when an electric voltage is applied to the stack. These component layers will expand within one ten thousandth of a second (0.1ms) with enormous, yet controlled force. The injector exploits this piezo force to open and close a valve.

The piezo injector is four times faster than traditional solenoid injectors. The injector technology is based on highly precise injection technology developed for ink jet printers.

Two-part Cleansing Process
Diesel engine emissions are 90 percent lower than they were in the 1980s. Located just behind the turbochargers, the oxidising catalytic converters use a 100 percent platinum coating with 400 cells per square inch. The oxidising catalytic converter utilises catalytic action to oxidize hydrocarbon and carbon monoxide emissions to carbon dioxide and water.

The next stage of the cleansing process is the reduction of particulates. A diesel particulate filter (DPF) reduces particulate emissions (the characteristic black smoke) to negligible levels. The DPF burns the particulates trapped in the filter at calculated intervals in a way that the process is unnoticed by the driver. The system knows when to burn the particulates by monitoring an increase in backpressure generated by the DPF when full of particulates.

DPF burn off generally occurs approximately every 400km or more frequently if the vehicle is driven mainly in urban traffic. Burn off (or active regeneration of the DPF) takes approximately 20 minutes in a two-phase burn process at 500 degrees C and 600 degrees C.

Nuts & Bolts

• 60 degree V6
• Compacted graphite iron - this is the first use of this material in volume production
• Block is further stiffed by an aluminium die-cast frame which includes the baffle plate
• Connecting rods are manufactured from sinter-forged steel and have fracture split bearing caps

Dry-tank Strategy
In fact, the Jaguar S-TYPE Diesel will never run its fuel tank dry. A fuel run-dry strategy has been programmed into the PCM (Powertrain Control Module) to prevent the fuel tank emptying completely. The reason is quite understandable - this strategy prevents damage to the fuel tank pump and the necessity of priming the fuel system.