BMW N45B16 Engine

  1. Specifications
  2. Overview, problems
  3. Performance tuning

N45B16 Specs

Manufacturer BMW Plant Hams Hall
Also called BMW N45
Production 2004-2011
Cylinder block alloy Aluminum
Configuration Straight-4
Valvetrain DOHC
4 valves per cylinder
Piston stroke, mm (inch) 72 (2.83)
Cylinder bore, mm (inch) 84 (3.3)
Compression ratio 10.2
Displacement 1596 cc (97.4 cu in)
Power output 85 kW (116 HP) at 6,000 rpm
Torque output 150 Nm (111 lb·ft) at 4,300 rpm
Redline 6,500 rpm
HP per liter 72.7
Fuel type Gasoline
Fuel system Bosch ME 9.2
Bosch ME17.4.5
Weight, kg (lbs)
Fuel consumption, L/100 km (mpg)

for E87 116i
8.8 (26.7)
4.9 (48)

6.2 (37.9)
Turbocharger Naturally aspirated
Oil consumption , L/1000 km
(qt. per miles)
up to 0.7
(1 qt. per 850 miles)
Recommended engine oil 5W-30
Engine oil capacity, L (qt.) 4.5 (4.75)
Oil change interval, km (miles) 7,000-10,000
Normal engine operating temperature, °C (F)
Engine lifespan, km (miles)
-Official information

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


The engine is installed in BMW 116i E87
BMW 316i E90

BMW N45B16 engine reliability, problems and repair

New 4-cylinder inline N45B16 engine was produced in 2004 on base of N42B18. This motor had new crankshaft with lower stroke, new pistons and modified connecting rods. At the same time Valvetronic system was removed from this version of engine.
N45 cylinder head differs from N42 with absence of valve lift system Valvetronic and new cap. At the same time other generator and spark plugs are used.
Engine is equipped by Bosch ME 9.2 control unit. But in 2007 it was replaced by Bosch ME17.4.5. Such engines are called N45NB16.
They were used in BMW 16i models.
N45B20S 2-liter sports version was produced along with N45B16.
At the same time N43B16 and N46B18 engines were constructed for basic BMW modifications available in cheap segment.
In 2011 this engine was replaced by turbocharged 1.6-liter N13B16 motor.

BMW N45B16 disadvantages and problems

1. Engine knocking. This problem is mainly connected with timing chain tensioner which should be checked. At the same time timing chains are not as reliable as you can expect. They also need replacement every 60,000 miles (100,000 km) of mileage due to the fact that they stretch. It can result in timing chain jumping.
2. Vibration. In the majority of cases this problem is connected with Vanos system. If you want to get rid of this problem you must have your Vanos cleaned.
At the same time BMW N45 engine is prone to pinking. That is why you are supposed to use gasoline and motor oil of high quality only. You should take it rather seriously and buy only recommended by BMW brand oil.

BMW N45B16 engine tuning

N45B16 Chip tuning

N45B16 was developed only for easy and comfortable city driving. That is why you will hardly find any high-performance racing parts for it. That is why the only thing left is to buy performance exhaust system and cold air intake. It will add extra 10 HP in combination with engine management tuning. If you still want to gain more power from your engine, you need to sell your BMW 116i/316i and buy better BMW model.