Jaguar has a new lump on the cards, a new 2.2 litre diesel unit. The new powertrain – which made its debut fitted to a prototype development mule – will feature in a future XF production car, with specifications and an estimated on-sale date to be announced at the New York Auto Show in April.

The new four-cylinder, 16-valve commonrail block develops 187 hp and 450 Nm of torque, and features a water-cooled turbocharger with low-friction pistons, new injectors and a new crankshaft. Performance specs include a 0-100 kph time of of 8.5 seconds and a 225 kph top speed.

It’s installed in a north-south configuration for the first time, and the new configuration allows the addition of a new oil pan and new electronic systems affecting the crankshaft, which allows a new intelligent Stop-Start system to operate more efficiently.

The last aims to reduce the prolonged time spent in the shutdown and start-up phase usually experienced in such systems – the Jag 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.

For example, in a busy roundabout, a driver may only briefly bring the vehicle to a stop, only to move off again quickly. In a conventional system, the engine needs to shutdown completely before restarting again; the system here is able to restart the engine while it’s shifting down from as little as 400 rpm, meaning it doesn’t need to come to a stop, translating to a more efficient restoration of drive capability.

Along with the new engine, the development vehicle also debuted an eight-speed ZF automatic gearbox, which will be paired to the block in production.