N20B20 Engine

14 February 2017 Writer Home » Engines » BMW engine Views: 37

Table of contents

1 BMW 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+ –

The engine is installed in

115 kW version:

2013-present BMW E89 Z4 sDrive18i

135 kW version:

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:

BMW N20 engine problems

Rough idling – possible reason: the throttle is fixed wekly or contamination of control valve Idle;
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.
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.