Despite never bringing any diesel models to the US before, Jaguar has unveiled its most efficient engine yet in the form of a new 2.2-liter diesel that could be coming here.
Developing 190hp and 332 lb-ft of torque, the new engine is capable of returning 43.5mpg US on the combined cycle while emitting 149g/km of CO2.
Making its debut on UK roads fitted in a prototype development vehicle, the new four-cylinder 16-valve common-rail diesel engine displaces 2179 cc and is installed in a north-south longitudinal configuration for the first time.
The new engine features a water-cooled turbocharger with low-friction pistons, new injectors and new crankshaft. The configuration allowed Jaguar engineers to add a new oil pan and electronic systems affecting the crankshaft to allow a 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 partially through the inclusion of the new crank sensor as well as a 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 traffic circle - 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, often leading to frustrating delays. The Jaguar system is able to restart the engine while it's shifting down from as little as 400rpm, meaning it does not need to come to a stop - drive is therefore restored more efficiently.
Along with the new engine, the development vehicle debuts an advanced eight-speed ZF automatic transmission. With the seventh and eight ratios effectively acting as overdrive gears, the new gearbox allows the 2.2-liter engine to be optimized to deliver swift responses when required, and effortless cruising to ensure the ideal balance between efficiency and performance.
The sprint to 62mph takes 8.5 seconds before achieving a maximum speed of 140mph.
The high levels of refinement expected of modern Jaguars are retained with engineers placing particular emphasis on sound insulation 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 in its class.
The new powertrain will feature in a future XF production car, with specifications and an estimated on-sale date being announced at the New York Auto Show.