The New Jaguar X-TYPE 2.0D | Part Seven

Jaguar X-TYPE


The Jaguar Advantage
  • Engine and installation are both specifically tailored for Jaguar’s requirements – especially for low noise, maximum refinement, fine driveability and effortless performance
  • Combustion Noise Sensor (CNS) system detects and reduces combustion noise on each piston stroke, giving petrol engine standards of smoothness and responsiveness
  • Continuous adjustment of Minimum Drive Pulse (MDP) means the Jaguar X404 diesel engine actually ‘learns’ how to be quieter the more it is driven
  • Cylinder block design offers maximum stiffness, for low mechanical noise transmission, with minimum weight
  • ‘Short-nozzle’ injectors, a unique intake system, and Jaguar calibration reduce combustion noise, improve refinement and optimise performance – especially mid-range flexibility
  • Variable geometry turbocharging and a bespoke intercooling system deliver high torque, with overboost facility
  • Jaguar-specific packaging includes numerous new sound, vibration and thermal insulation measures, under the bonnet, under the floor and in the cabin
Beyond smoothness, quiet running and mechanical refinement, the X-TYPE 2.0D produces ample power and torque. Turbocharging contributes to this by increasing the pressure of the intake air to improve cylinder filling, which allows more fuel to be burned more effectively, and so raises overall efficiency. The X404 engine uses a variable geometry turbocharger with an overboost function that allows it to deliver short periods of boost beyond the normal upper limit. Like all the other work on tailoring this engine to Jaguar’s needs, this is aimed at enhancing real world driveability.

In addition to the turbocharger, the Jaguar induction system includes an aluminium-cored charge-air cooler (intercooler) that is mounted within the cooling pack. This reduces the temperature of the air after it has been compressed by the turbocharger and before it enters the cylinders. Cooler air is denser and gives better combustion efficiency.

Weight is a key factor in performance at all levels and the X-TYPE 2.0D scores highly on this count, with a kerb weight of 1,502kg (3,311lb). That is lighter than, for example, the 2.5 and 3.0 litre V6 petrol X-TYPES. This helps the new 2.0D to a top speed of 125mph (201km/h) and gives it a 0-60mph sprint potential of just 9.5 seconds – acceleration that beats both the diesel-powered Audi A4 and the Mercedes C220 CDI. And in mid-range, flexibility and response, the Jaguar is even more impressive. At 220Nm/tonne (164 lb ft per ton), it has the highest torque-to-weight ratio of any competitor in the compact premium saloon segment.

Direct Injection Common-Rail Diesel Technology - How It Works

The advantages of common-rail direct fuel injection technology are central to achieving the levels of performance, economy and refinement necessary for the X-TYPE 2.0D. The ultra-high injection pressures and exceptional controllability of direct common-rail injection is the one technology that more than any other has made the latest generation of diesel engines so much more efficient and refined than previous generations.

In a petrol engine, fuel is mixed with air drawn in on the intake stroke, and ignited at the end of the compression stroke by an electrical spark. In a diesel engine, with its much higher compression ratios, air taken in on the intake stroke is compressed to such an extent that it becomes hot enough to ignite the diesel fuel (which is injected at high pressure at the end of the compression stroke) without any other form of ignition.

continues... | Part Eight
Published 15 June 2003 Melanie Carter

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