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make way for the electric drivetrain, and so the naturally aspirated 6.75-litre petrol engine and six-speed auto have been replaced by a lithium-ion battery pack and two electric motors mounted on the rear sub-frame.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.”
No of doors/seats 4 / 5 (optionally 4)Vehicle length 5840 mm / 229.9 inVehicle width 1990 mm / 78.3 inVehicle height (unladen) 1638 mm / 64.5 inWheelbase 3570 mm / 140.6 inTurning circle 13.8 m / 45.3 ftTrack, front 1687 mm / 66.4 inTrack, rear 1671 mm / 65.8 inWidth at shoulder height, front 1509 mm / 59.4 inWidth at shoulder height, rear 1431 mm / 56.3 inLeg room, front 1028 mm / 40.5 inLeg room, rear 1109 mm / 43.7 inHead room, front 1051 mm / 41.4 inHead room, rear 979 mm / 38.5 inBoot volume (DIN) 460 ltr / 16.2 cu ft
Unladen weight (DIN) 2,720 kgGross vehicle weight 3,030 kgPayload 300 kgAxle load limit, front 1,473 kgAxle load limit, rear 1,548 kgMaximum power output 290 kWTorque 800 Nm
Battery:Chemistry NCM (Lithium-Nickel-Cobalt-Manganese-Oxide) li-ionNumber of cells 96 in pouch designCapacity 71kWhBattery pack weight 640 kgPeak current 330 kW at 850 AmpsCharge time (est) 20 hours single phase / 8 hours three-phaseTransmission type Single speed 6:5:1 with integral differentialSteering type EHPS Rack and pinion, speed-sensitive variable-rate power assistanceBrakesFront / diameter Ventilated disc / 374 mm / 14.7 inRear / diameter Ventilated disc / 370 mm / 14.6 inDrag Cd 0.37Drag Cd x A 1.041m2 / 11.2 ft2Top speed 160 kph (governed)Acceleration 0-60 mph Under 8 secondsCO2 emissions NilTyre, front Goodyear EMT 255/50 R21 106WTyre, rear Goodyear EMT 285/45 R21 109WWheels (21 in alloy)Wheel size, front 8 in x 21 inWheel size, rear 9.5 in x 21 in12V Battery capacity / installed position 90+70 Ah / boot