Rolls Royce RR4 is powered by 6.6 litre of turbo charge V12 engine with 8-speed automatic ZF gearbox. The Roll Royce RR4 series will be ready in 2010. But this car has been scheduled to show off at Geneva this March. Based on the information Roll Royce made the RR4 by adopting the Panthom fuel and CO2 efficiency like the Panthom series but little bit smaller. Wait till Roll Royce officially announce the RR4 at Geneva.