Jaguar’s new 2.2-liter 190hp engine image

Jaguar unveiled today its most efficient engine yet in the form of a new 2.2-liter diesel unit. The new engine will be installed on the upcoming XF facelift.

Developing 190 PS and 332 lbs. ft of torque, the new engine is capable of returning 52.3 mpg on the combined cycle while emitting 149 g/km of CO2 the British automaker said on Wednesday.

The new four-cylinder engine features a water-cooled turbocharger with low-friction pistons, new injectors and a new crankshaft. The new configuration allowed Jaguar engineers to add a new oil pan and new electronic systems affecting the crankshaft to allow the new intelligent Stop-Start system to operate more efficiently.

The start Stop technology is expected to improve fuel efficiency by up to 7%. Jaguar took special care so that the new 2.2 diesel of the facelifted XF will make less noise than current models. They used active engine mounts to reduce vibration and took various sound deadening measures around the engine and bulkhead.

At the moment the XF comes with a 3.0-litre V6 diesel (shared with the Land Rover Discovery 4 and Range Rover Sport). It’s available with 240bhp or 275bhp giving it tremendous performance but emissions aren’t a strong point – both models post figures of 42mpg and 179g/km of CO2.