Engine BMW N45B16

The small 1.6-liter BMW N45B16 engine was developed in 2004 based on the predecessor N42B18. The new engine has a different crankshaft with a shorter piston stroke (it was 81, now 72 mm), different connecting rods and a modified piston. In addition, the Valvetronic valve lift system is not used on the N45B16.

The cylinder head is covered with another cover, a new generator and candles are used. Engine management system Bosch ME 9.2. Since 2007, the engine has been updated, received a new Bosch ME17.4.5 control unit, and the letter N has been added to the name – N45NB16.

This engine was used on BMW cars with an index of 16i. Along with this engine in the limited edition N45 series, a 2-liter sports version was also produced – the N45B20S.


Production years 2004-2011
Displacement, cc 1596
Fuel system injector
Power output, hp 116 /6000 rpm
Torque output, Nm 150 /4300 rpm
Cylinder block aluminum R4
Block head aluminum 16v
Cylinder bore, mm 84
Piston stroke, mm 72
Compression ratio 10.5
Features Bosch ME 9.2 (N45B16)
Bosch ME 17.4.5 (N45NB16)
Hydraulic lifters yes
Timing drive chain
Phase regulator double VANOS
Turbocharging no
Recommended engine oil 5W-30
Engine oil capacity, liter 4.5
Fuel type petrol
Euro standards EURO 4/5
Fuel consumption, L/100 km (for 116i E87)
— city
— highway
— combined
Engine lifespan, km ~320 000

Disadvantages of the N45B16 engine

  1. Knocking in the motor. Most often, problems are hidden in a faulty timing chain tensioner. At the same time, the chains, in principle, have a low service life and after the car has passed about 100 thousand km, they can easily stretch. Replacement required.
  2. Vibration at idle speed. The breakdown may be in the malfunction of the Vanos system. Therefore, it will need to be checked and cleaned. Complete replacement possible.

It should also be added that the power unit of this series can exhibit a detonation of the fuel mixture. The reason is the poor quality of fuel or oil. The latter should only be of the brand and series that the manufacturer himself advises to use – the BMW plant. Otherwise, the likelihood of developing big troubles is high – even a major overhaul is possible.

4 thoughts on “Engine BMW N45B16”

  1. Njama Selemani

    i want to know more about BMW N45.
    my BMW N45 fuel consumption is 7.3km per 1 petrol litre . is that normal according to you experience. advice what to do if it is not normal place assist me on this.
    sorry it N45B16 bmw.

    1. I’d say it’s high fuel consumption, but it could be due to your driving style or operating conditions.
      Even if this is a consequence of a malfunctioning engine, there can be many reasons for this.

    2. My 116i (85kw) used to consume 8.8l-100km and i changed the spark plugs (after 40’000 km) and now it consumes 7.8l-100km

    3. FSHenrique

      I have an N45B16 that does 9.5km/l or 10.5L/100km… I think the consumption is normal, but it is having a problem with the MAF reading voltage, which increases consumption. It will be repaired soon.
      Another problem is the engine operating at high temperature, which causes premature wear of the valve guide seals and PPF protectors. They should be replaced as soon as they show higher oil consumption with seals from the Febi Blistein brand, which are more resistant to high temperatures.

Leave a Comment

Your email address will not be published. Required fields are marked *

Scroll to Top