New engine coming for Jaguar XF
31st March, 2011
Jaguar has unveiled its most efficient engine yet in the
form of a new 2.2-litre diesel unit.
Developing 190 PS and 332 lbs ft of torque, the efficient new engine is capable of emitting just 149
g/km of CO2 (combined cycle).
Making its debut on UK roads fitted to a prototype development vehicle, the new four-cylinder
16-valve common rail diesel engine displaces 2,179 cc and is installed in a north-south configuration
for the first time. The new 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.
Intelligent Stop-Start aims to reduce the prolonged time spent in the shutdown and start-up phase
usually experienced in such systems. The Jaguar system overcomes this partly through the inclusion of
the new crankshaft sensor and fuel rail pressure holding system meaning the engine needs less time to
restore drive through an innovative engine restart capability. This is best demonstrated when
approaching a busy roundabout – in situations where the driver briefly brings the vehicle to a stop
only to move off again quickly. In conventional systems the engine needs to shutdown completely before
restarting again, leading to often frustrating delays. The Jaguar system is able to restart the engine
while it's shifting down from as little as 400 rpm meaning it does not need to come to a stop – drive
is therefore restored more efficiently.
The inclusion of the Stop-Start function is estimated to increase overall fuel efficiency between
five and seven per cent.
Along with a new engine, the development vehicle debuts an advanced eight-speed ZF automatic
gearbox. With the seventh and eight ratios effectively acting as overdrive gears, the new gearbox
allows the 2.2-litre engine to be optimised to deliver swift responses when required and effortless
motorway cruising ability to ensure the ideal balance between efficiency and performance. The sprint
to 100 km/h (62 mph) takes 8.5 seconds before achieving a maximum speed of 140 mph.
The high levels of refinement expected of modern Jaguars are retained with engineers putting
particular emphasis on sound deadening around the engine and bulkhead as well as active engine mounts
to reduce vibration. The result is a 3dB reduction in cabin noise to make the car one of the most
refined vehicles in its class.
The new powertrain will feature in a future XF production car with specifications and an estimated
on-sale date being announced in April at the New York Motor Show (USA).
An announcement regarding which markets will offer the new entry level engine in the Jaguar XF
will come along in due course.