Showing at the Geneva Motor Show for the first time also is the Rolls-Royce 102EX Phantom Experimental Electric, a plug in version of the Rolls-Royce Phantom sedan.

Rolls-Royce-102EX-1

News of the Rolls-Royce 102EX was covered a few days ago, however we've finally been handed the tech sheets to this massive marvel.

While the brilliant V12 is a fabulously smooth engine, it had to make way for the electric drivetrain, and so the naturally aspirated 6.75-litre petrol engine and six-speed auto have been replaced by a lithium-ion battery pack and two electric motors mounted on the rear sub-frame. A single speed transmission with integrated differential is how the drive gets to the road.

Each electic motor has a power output of 145kW giving the 102EX 290kW, which is down on the 338kW from the petrol engine. But torque is up - from 720Nm to 800Nm, and over a larger range as electric motors offer full torque from zero revs.

Rolls-Royce says that pre-testing demonstrates a potential range of about 200km, and a 0-100km/h time of just under eight seconds - moving 2.6 tonnes was never going to be easy. Top speed will be limited (to conserve range) to 160km/h.

For those really up with the technology, the tech sheet tells us that "the Nickel Cobalt Manganese battery chemistry holds around 230Wh/kg,a high energy density which is important in achieving an acceptable range between re-charges." Incidentally, the battery pack is said to be the largest ever fitted to a road car, but then this is a lot of car.

The 102EX's battery pack contains five modules of cells, a 38-cell module, a 36-cell module, and three smaller modules of ten, eight and four arranged in the shape of the original engine and gearbox assembly.

Three different charging units are fitted to the battery pack, which allow both single-phase - which can recharge in 20 hours - or three-phase charging, which takes eight hours. A charger is also fitted to enable induction - or wireless charging - a technology being trialled in Phantom EE.

Rolls-Royce's CEO Torsten Müller-Ötvös commented:

“Today, Rolls-Royce Motor Cars begins an exploration into alternative drive-trains, seeking clarity on which technology may be suitable to drive Rolls-Royce motor cars of the future. The alternative drive-train we choose must deliver an authentic Rolls-Royce experience. It must be a technology that is right for our customers, our brand and which sets us on a sound footing for a sustainable future. That is why this project is so important.”

TECHNICAL SPECIFICATIONS

No of doors/seats                                 4 / 5 (optionally 4)

Vehicle length                                       5840 mm / 229.9 in

Vehicle width                                        1990 mm / 78.3 in

Vehicle height (unladen)                  1638 mm / 64.5 in

Wheelbase                                               3570 mm / 140.6 in

Turning circle                                        13.8 m / 45.3 ft

Track, front                                             1687 mm / 66.4 in

Track, rear                                               1671 mm / 65.8 in

Width at shoulder height, front      1509 mm / 59.4 in

Width at shoulder height, rear        1431 mm / 56.3 in

Leg room, front                                     1028 mm / 40.5 in

Leg room, rear                                       1109 mm / 43.7 in

Head room, front                                  1051 mm / 41.4 in

Head room, rear                                    979 mm / 38.5 in

Unladen weight (DIN)                         2,720 kg

Gross vehicle weight                           3,030 kg

Payload                                                     300 kg

Axle load limit, front                           1,473 kg

Axle load limit, rear                             1,548 kg

Maximum power output                    290 kW

Battery:

Chemistry                                                 NCM (Lithium-Nickel-Cobalt-Manganese-Oxide) li-ion

Number of cells                                      96 in pouch design

Capacity                                                    71kWh

Battery pack weight                             640 kg

Peak current                                           330 kW at 850 Amps

Charge time (est)                                  20 hours single phase / 8 hours three-phase

Transmission type                               Single speed 6:5:1 with integral differential

Steering type                                          EHPS Rack and pinion, speed-sensitive variable-rate power assistance

Brakes

Front / diameter                                   Ventilated disc / 374 mm / 14.7 in

Rear / diameter                                     Ventilated disc / 370 mm / 14.6 in

Drag  Cd                                                     0.37

Drag  Cd x A                                             1.041m2 / 11.2 ft2

Top speed                                                 160 kph (governed)

Acceleration 0-60 mph                      Under 8 seconds

CO2 emissions                                         Nil

Tyre, front                                                Goodyear EMT 255/50 R21 106W

Tyre, rear                                                 Goodyear EMT 285/45 R21 109W

Wheels (21 in alloy)

Wheel size, front                                    8 in x 21 in

Wheel size, rear                                      9.5 in x 21 in