Engine Mini N12B14A

The 1.4-liter Mini One N12B14A engine was produced at a factory in England from 2007 to 2010 and installed on the simplest versions of the Mini in the back of the R56 and the Clubman station wagon in the back of the R55. A similar power unit was installed on some Peugeot-Citroen models under the EP3 index.

Prince-series engines: N12B14A, N12B16A, N16B16A, N14B16A, N14B16C, N18B16A, N18B16C.


Production years 2007-2010
Displacement, cc 1397
Fuel system distributed injection
Power output, hp 75 (One 75)
95 (One 95)
Torque output, Nm 120 (One 75)
140 (One 95)
Cylinder block aluminum R4
Block head aluminum 16v
Cylinder bore, mm 77
Piston stroke, mm 75
Compression ratio 11.0
Features DOHC, Valvetronic
Hydraulic lifters yes
Timing drive chain
Phase regulator on both shafts
Turbocharging no
Recommended engine oil 5W-30
Engine oil capacity, liter 4.2
Fuel type petrol
Euro standards EURO 4
Fuel consumption, L/100 km (for Mini One 2009)
— city
— highway
— combined
Engine lifespan, km ~250 000

The engine was installed on:

  • Mini Clubman R55 in 2009 – 2010;
  • Mini Hatch R56 in 2007 – 2010.

Disadvantages of the Mini N12B14A engine

  • The most famous problem with these engines is oil burn and intake coking;
  • The components of the timing chain and especially the tensioner are distinguished by a low resource;
  • Vanos-type phase regulators and the Valvetronic system also serve relatively little;
  • The engines of this family are also famous for regular leaks of lubricant and antifreeze;
  • The weak points of the unit include a water pump, a thermostat and a second lambda probe.

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