Historically, Rolls-Royce has somewhat smugly declined to quote horsepower numbers, utilizing amusingly evasive language like "entirely sufficient" to describe its engines' power outputs. Perhaps a sign of the times, Rolls is now being a bit more forthcoming about details for its upcoming "baby" RR4 model, including approximate horsepower numbers.

The company has disclosed that the RR4 will be powered by a new, 6.6-liter turbocharged V12 engine that gives "upwards of 500bhp." Further, it will route that prodigious output through a ZF transmission with no less than eight forward ratios. Despite its ability to generate big power figures, Rolls says that one important drivetrain figure will be smaller than any other Rolls on the market: C02 output.

The news came from CEO Tom Purves himself at a New York press event for the 200EX, where the Geneva concept car is making its first stop on a world tour designed to get prospective clients in the car and booking orders for the production RR4 version.

The BMW-owned British automaker has long been famous for its peerless interiors and isolated ride, but Purves promises that the RR4 will bring with it a new emphasis on driving entertainment: "... we have consciously engineered this car to be more involving and dynamic for those owners around the world that will wish to drive it themselves."

While we don't expect Porsche Cayman-baiting dynamics, we look forward to seeing what the company views as more involved driving dynamics when the car starts rolling out the front doors of its Goodwood production facility. Official press release after the jump.