N20B20 Engine

BMW N20B20 Engine

The BMW N20 engine is a four-cylinder BMW engine with turbocharging and direct fuel injection, which is mounted on various BMW models with indexes 1.8i, 2.0i and 2.8i at the end of the name after 2011.

This engine gradually replaced the 4-cylinder N46 and N43, and 6-cylinder N52 and N53.

Efficiency of modern  engines is a common question. Using less fuel without loss of capacity is necessary, but first you need to ensure there is no residual combustion it; secondly, to reduce any loss of useful energy in friction at the cylinder-piston group, the heat transfer through the cylinder walls, the hydrodynamic resistance in pumping the oil through the system and so on.

The secret lies in the use of another adjuster supplied amount of air into the cylinders. Typically, the throttle valve is used for this purpose. It is located in the inlet duct, blocking the path of the air flow, reduces the filling of cylinders, and reduces a torque motor. This meaning that at low engine loads, the damper is almost closed, in consequence of which there is a significant increase in resistance to the intake system. That is why the engine at low loads is not working efficiently.

BMW engineers abandoned the throttle, and the restriction of air supply to the cylinders, it was decided to carry out with the help of variable length intake. However, this adjustment was implemented indirectly – through a change in the height of the opening of the intake valve, the mechanism of which later got its name – Valvetronic.

The BMW N20 engine will be gradually replaced by the BMW B48 engine.

BMW N20 Specs

Manufacturer BMW Plant Hams Hall
Also called BMW N20
Production 2011-present
Cylinder block alloy Aluminum
Configuration Straight-4
Valvetrain DOHC
4 valves per cylinder
Piston stroke, mm (inch) 90.1 (3.55)
Cylinder bore, mm (inch) 84 (3.31)
Compression ratio 10
11
Displacement 1997 cc (121.9 cu in)
Power output 115 kW (156 HP) at 5,000 rpm
135 kW (184 HP) at 5,000 rpm
160 kW (218 HP) at 5,500 rpm
180 kW (245 HP) at 5,000 rpm
Torque output 240 Nm (177 lb·ft) at 1,250-4,500 rpm
270 Nm (199 lb·ft) at 1,250-4,500 rpm
310 Nm (229 lb·ft) at 1,350-4,800 rpm
350 Nm (258 lb·ft) at 1,250-4,800 rpm
Redline 7,000 rpm
HP per liter 78.1
92.1
109.2
122.7
Fuel type Gasoline
Fuel system Bosch MEVD17.2.4
Weight, kg (lbs)
Fuel consumption, L/100 km (mpg)
-City
-Highway
-Combined
for F30 328i
8.5 (27.7)
5.2 (45.2)
6.4 (36.8)
Turbocharger Mitsubishi TD04LR6-04HR.15TK31-60T
Oil consumption , L/1000 km
(qt. per miles)
up to 0.7
(1 qt. per 850 miles)
Recommended engine oil 5W-30
5W-40
Engine oil capacity, L (qt.) 5 (5.3)
Oil change interval, km (miles) 7,000-10,000
(4,500-6,000)
Normal engine operating temperature, °C (F)
Engine lifespan, km (miles)
-Official information
-Real

250+ (155)
Tuning, HP
-Max HP
-No life span loss
300+

n20-engine

The engine is installed in

115 kW version:

  • 2013-present BMW E89 Z4 sDrive18i

135 kW version:

  • 2011–present E84 X1 xDrive/sDrive20i
  • 2011–present F25 X3 xDrive20i
  • 2012–2015 F30 320i
  • 2013–present F34 320i GT
  • 2011–present F10 520i
  • 2013-present F10 520Li
  • 2011–present E89 Z4 sDrive20i
  • 2014–present F22 220i
  • 2015-present Brilliance Huasong 7 MPV

160 kW version:

  • 2012–present F20 125i
  • 2013–present F10 525Li
  • 2015-present Brilliance Huasong 7 MPV

170 kW version:

  • 2014–present F22 225i

180 kW version:

  • 2011–present E89 Z4 sDrive28i
  • 2011–2015 E84 X1 xDrive/sDrive28i
  • 2012–present F25 X3 xDrive28i
  • 2011–2016 F30 328i
  • 2011–present F10 528i
  • 2013–2016 F34 328i GT
  • 2014–2016 F22 228i
  • 2014–present F26 X4 xDrive20i

BMW N20 engine problems

  1. Rough idling – possible reason: the throttle is fixed wekly or contamination of control valve Idle;
  2. Engine vibrations – the reason is hidden in the state of the fuel injector. Time passes and the resource of  injector decreases, so the fuel-air mixture entering the engine cylinders is depleted, which inevitably leads to a violation of the dynamic characteristics of the engine.
  3. Faulty of air flow meter – the reason for the delay of the ignition system and enrichment of fuel-air mixture.

BMW N20 engine tuning

As can be easily understood from the preceding description, in fact, there are only two motors of BMW N20: one with a compression ratio of 10:1 and the other with a compression ratio of 11:1. The range of other motors provided by the wealth of different settings of the engine control unit.

Structurally, the difference between these engines is only in the form of pistons. For engines with a compression ratio of 11:1 is used with a smaller volume of the piston recess in the piston crown.

Thus, any engine with a compression ratio of 10:1 is possible to boost on 245 hp. This applies to models of BMW z4-1.8i, BMW 125i, BMW-X1 20i and BMW-X3 20i, as well as some models with the index 20i, which has the engine with low compression (available in countries with poor gasoline, S858 option).

For other models N20B20-U0 motor to achieve the identical factory settings is necessary to change the piston. However, experience has shown that engines with a compression ratio of 11 in the whole work fine on a regular firmware 245 hp.

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