OUJIAXIN 6 Cylinders N55B30 3.0T complete engine for bmw X5 X3 X6 Z4 X4 535 640 335

Description

The main differences between the N55 and its N54 predecessor are the use of a single turbocharger, the addition of Valvetronic and the type of fuel injectors. Whilst the N54 used a twin-turbo arrangement, the newer N55 uses only a single twin scroll turbocharger.[3][4] Valvetronic (variable valve lift)[5] is claimed to improve throttle response, low-rev torque, exhaust emissions and to reduce fuel consumption by 15%.[6][5][7] The direct injection system uses solenoid-type injectors, instead of the piezo-type fuel injectors used by its N54 predecessor. The piezo injectors were more expensive and BMW decided they were not worthwhile outside of Europe, because the potential benefits of lean-burn operation could not be fully realised.[5]

Applications:
2011–2018 F06/F12/F13 640i[12]
2012–2013 E82/E88 135is[13]
2012–2015 F20/F21 M135i[14][15]
2012–2015 F01/F02 740i/Li