All-New Jaguar XJ

DIRECT INJECTION

One of the key features of the new petrol engines is an industry-first, centrally-mounted, six-hole, spray-guided fuel injection system, delivering fuel in a fine, high quality spray at a pressure of up to 150bar directly to the cylinder (see video, right). This substantially improves low-speed, dynamic response and improves torque throughout the rev range.

The positioning of the injectors ensures fuel is precisely delivered to the centre of the combustion chamber, maximising air-fuel mixing and improving combustion control. Fuel is delivered via twin, high-pressure fuel pumps that are driven via auxiliary shaft in the all-new engine block.

The charge cooling effects of the direct-injection fuel system have allowed the compression ratio of the naturally aspirated engine to be raised to 11.5:1, further optimising the engine economy. The supercharged engine also benefits from a compression ratio increase to 9.5:1 from 9.1:1 in the
previous 4.2-litre.

During the engine warm-up phase, the combustion system employs multiple injection mode strategies to deliver 50 percent more heat for fast catalyst warm-up and emissions reduction.

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