Shown at the recent Busworld Europe event, in Brussels, the X12 delivers up to 474bhp and is certified to Euro VI Phase D regulations.
The 11.8-litre engine weighs less than 920kg, thanks to a new lightweight sculptured engine block and use of high-strength composite materials for the oil pan and valve cover.
A new in-cylinder combustion formula eliminates the need for exhaust gas recirculation. The EGR-free X12 lowers heat rejection by around 40% compared with that of similar engines using cooled EGR, says Cummins, allowing the full power potential of the X12 to be realised while meeting Euro VI D standards.
Another key design objective, says Cummins, was to minimise friction losses throughout the engine, including the water pump, gear train, lube system and power cylinder.
The X12’s fuel system is derived from the more powerful X15 engine, with Cummins injection technology enabling smooth and rapid engine response to increasing vehicle demands, while minimising fuel consumption.
“The X12 will set a new benchmark in its class by providing unprecedented levels of performance for coaches in Europe and markets around the world as they transition to meet Euro VI equivalent emission standards,” says Brian Wilson, Cummins’ executive director for global bus business.