BMW N43B16 Engine

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

N43B16 Specs

Manufacturer BMW Plant Hams Hall
Also called BMW N43
Production 2007-2011
Cylinder block alloy Aluminum
Configuration Straight-4
Valvetrain DOHC
4 valves per cylinder
Piston stroke, mm (inch) 75.7 (2.98)
Cylinder bore, mm (inch) 82 (3.23)
Compression ratio 12
Displacement 1599 cc (97.6 cu in)
Power output 90 kW (122 HP) at 6,000 rpm
Torque output 160 Nm (118 lb·ft) at 4,250 rpm
Redline 7,300 rpm
HP per liter 76.3
Fuel type Gasoline
Fuel system Siemens MSD 81.2
Weight, kg (lbs)
Fuel consumption, L/100 km (mpg)

for E87 116i
7.5 (31.4)
4.8 (49)

5.8 (40.6)
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.) 4.25 (4.5)
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 N43B16 engine reliability, problems and repair

BMW N43B16 engines were produced to replace N42B18. However they showed up a bit late and were constructed on base of N43B20. This motor had cylinders with smaller diameter which was 82 mm in comparison with 2-liter N43B16 engine. It has shorter crankshaft which is 75.7 mm stroke. Displacement was decreased to 1.6 liters.
If compared with its predecessor N42B18 new engine has pistons with higher compression ratio (12). At the same time direct injection system was installed while Valvetronic was removed.
Siemens MSD 81.2 engine control unit is used in new motor.
This engine was produced for BMW 16i models.
N45B16 and N46B18 versions were also produced along with new engine for cheaper BMW modifications.
1.6-liter turbocharged 4-cylinder N13B16 engine turned out to be a new gen motor which replaced N43 in 2011.

BMW N43B16 disadvantages and problems

This engine is nothing but a smaller version of N43B20. It means that it has actually the same problems. HERE you can find out detailed information on possible BMW N43 malfunctions.

BMW N43B16 engine tuning

N43B16 Chiptuning

You will hardly find any performance parts and details to complete your upgrading ideas. This is due to the fact that N43 is designed for a city driving but not for racing. If you want to get additional 10-15 HP, you need to buy cold air intake, performance exhaust and complete engine management tuning
However the best solution is to buy more powerful BMW model.