The BMW N43B16 is a 1.6 L (1,599 cc, 97.6 cu·in) straight-four natural aspirated four-stroke liquid-cooled internal combustion gasoline engine, manufactured by Bayerische Motoren Werke AG on the BMW Plant Hams Hall (Coleshill, Birmingham, United Kingdom) 2007 to 2011.
A 82.0 mm (3.23 in) cylinder bore and 75.7 mm (2.98 in) piston stroke give the N43B16 engine a total of 1,599 cc of displacement. The compression ratio rating is 11.7:1.
The BMW N43B16 engine produced 122.5 PS (90.0 KW; 121.0 HP) at 6,000 rpm of maximum output power and 160 Nm (16.3 kg·m; 118.1 ft·lb) at 4,250 rpm of peak torque.
The BMW N43B16 features:
- Chain-driven dual overhead camshaft (DOHC)
- 16 valves (2 per cylinder)
- Aluminum cylinder block
- Aluminum cylinder head
- Direct injection fuel system
- Siemens MSD 81.2 engine management system
- Fully electronic throttle
- VANOS (Variable Valve Timing System from BMW) for both inlet and exhaust camshafts
- Pressurized lubrication system
- Liquid-cooled cooling system
General information
| Engine Specifications | |
| Engine model | N43B16 |
| Engine type | 4-stroke, DOHC, inline-4 |
| Displacement | 1.6 L, 1,599 cm3, (97.6 cu·in) |
| Max. horsepower | 122.5 PS (90.0 KW; 121.0 HP) at 6,000 rpm |
| Max. torque | 160 Nm (16.3 kg·m; 118.1 ft·lb) at 4,250 rpm |
| Cooling system | Liquid-cooled |
| Lubricating system | Pressurized lubrication |
| Fuel system | Direct injection |
| Engine management system | Siemens MSD 81.2 |
| Starting system | Electric starter 12V |
| Firing order: | 1-3-4-2 |
| Dimensions (L x W X H) | – |
| Dry weight | – |
Cylinder Block and Head
| Cylinder block | |
| Cylinder block alloy: | Aluminum |
| Compression ratio: | 11.7:1 |
| Cylinder bore: | 82.0 mm (3.23 in) |
| Piston stroke: | 75.7 mm (2.98 in) |
| Cylinder internal diameter (standard): | 82.000 mm (3.2283 in) |
| Piston skirt outer diameter (standard): | 81.980-82.020 mm (3.2275-3.2287 in)) |
| Number of piston rings (compression / oil): | 2/1 |
| Side clearance (Top): | 0.020-0.060 mm (0.0008-0.0024 in)) |
| Side clearance (Second): | 0.015-0.060 mm (0.0006-0.0024 in) |
| Ring end gap (Top): | 0.150-0.300 mm (0.0059-0.0118 in) |
| Ring end gap (Second): | 0.200-0.400 mm (0.0079-0.0157 in |
| Number of main bearings: | 5 |
| Crankshaft main journal diameter: | No. 1-4: 56.000 mm (2.2047 in) No. 5: 65.000 mm (2.5590 in) |
| Crankpin journal diameter: | 50.000 mm (2.5590 in) |
| Cylinder head | |
| Cylinder head alloy: | Aluminium |
| Valve arrangement: | DOHC, chain-driven |
| Valves: | 4,(16 valves in total) |
| Valve head diameter (INTAKE): | 29.300 mm (1.1535 in) |
| Valve head diameter (EXHAUST): | 26.300 mm (1.0354 in) |
| Valve seat angle (INTAKE): | 45° |
| Valve seat angle (EXHAUST): | 45° |
| Valve margin (INTAKE): | 1.120 mm (in) |
| Valve margin (EXHAUST): | 1.650 mm (in) |
| Valve steam diameter (INTAKE): | 6.000 mm (0.2362 in) |
| Valve steam diameter (EXHAUST): | 6.000 mm (0.2362 in) |
Tightening torque specs
| Tightening torque specs | Main bearing cap | Step 1: 20 Nm (2.0 kgf·m; 14.8 ft·lb) Step 2: Turn all bolts 70° |
| Connecting rod bearing cap | Step 1: 20 Nm (2.0 kgf·m; 14.8 ft·lb) Step 2: Turn all bolts 120° |
| Lower part of the crankcase block | M8x40: 22 Nm (2.2 kgf·m; 16.2 ft·lb) M8x26: 22 Nm (2.2 kgf·m; 16.2 ft·lb) |
| Oil injectors to cylinder block | 12 Nm (1.2 kgf·m; 8.9 ft·lb) |
| Head tightening procedure and torque specs | M10x170 Step 1: 30 Nm (3.1 kgf·m; 22.1 ft·lb) Step 2: Turn all bolts 90° Step 3: Turn all bolts 90° Step 4: Turn all bolts 45° M9x95, M9x125 |
Service Data
| Compression pressure | |
| Standard: | 10-11 bar (10.1-11.2 kg/cm2; 145-160 psi) |
| Oil system | |
| Lubrication system: | Pressurized lubrication |
| Oil type: | BMW Lognlife-04 |
| Recommended oil: | SAE 5W-30, 5W-40 |
| Oil capacity: | 4.25 liters (4.49 US.qts, 3.74 Imp. qts) |
| Oil consumption , : | Up to 0.7 L/1,000 km (1 qt. per 850 miles) |
| Ignition system | |
| Spark plug | NGK ZKBR7A-HTU |
| Spark plug gap: | 0.5 mm (0.0197 in) |
Applications
| Model | Years Produced |
| BMW 116i (E87) | 2007-2009 |
| BMW 316i (E90) | 2008 |
References
1. BMW TIS (Technical Information System)
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