The BMW N43B16 is a 1.6 liters (1,599 cc, 97.6 cu·in) straight-four, four-stroke cycle natural aspirated gasoline engine from the BMW N43-family. The engine was manufactured from 2007 to 2011 on the BMW Plant Hams Hall (Coleshill, Birmingham, United Kingdom).
The N43B16 engine features an aluminum cylinder block and aluminum head with a dual overhead camshaft (DOHC) and four valves per cylinder (16 in total). The cylinder bore is 82 mm (3.23 in) and the piston stroke is 75.7 mm (2.98 in)). Compression ratio rating is 11.7:1. This engine used a direct injection fuel system and the Siemens MSD 81.2 engine management system, dual VANOS (Variable Valve Timing System from BMW) for both inlet and exhaust camshafts, fully electronic throttle without mechanical backup.
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 breakdown of the engine code is as follows:
- N43 – Engine Family
- B – Gasoline
- 16 – 1.6 Liter Displacement
General information
| Engine Specifications | |
| Engine code | N43B16 |
| Layout | Four stroke, Inline-4 (Straight-4) |
| Fuel type | Gasoline |
| Production | 2007-2011 |
| Displacement | 1.6 L, 1,599 cc (97.6 cu in) |
| Fuel system | Direct injection |
| Power adder | None |
| 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 |
| Firing order | 1-3-4-2 |
| Dimensions (L x H x W): | – |
| Weight | – |
Cylinder block
| 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) | |
| Number of piston rings (compression / oil): | 2 / 1 | |
| Number of main bearings: | 5 | |
| Cylinder inner diameter (standard): | 82.000 mm (3.2283 in) | |
| Piston skirt diameter (standard): | 81.980-82.020 mm (3.2275-3.2287 in) | Piston ring side clearance: | Top | 0.020-0.060 mm (0.0008-0.0024 in) |
| Second | 0.015-0.060 mm (0.0006-0.0024 in) | |
| Piston ring end gap: | Top | 0.150-0.300 mm (0.0059-0.0118 in) |
| Second | 0.200-0.400 mm (0.0079-0.0157 in | |
| Crankshaft journal diameter: | 1-4: 56.000 mm (2.2047 in) 5: 65.000 mm (2.5590 in) | |
| Crankpin diameter: | 50.000 mm (2.5590 in) | |
Main bearing cap tightening procedure and torque specs:
- Step 1: 20 Nm (2.0 kgf·m; 14.8 ft·lb)
- Step 2: Turn all bolts 70°
After securing bearing cap bolts, make sure crankshaft turns smoothly by hand.
Connecting rod bearing
- 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)
Cylinder head
| Cylinder head | ||
| Cylinder block alloy | Aluminum | |
| Valve Arrangement: | DOHC, chain driven | |
| Valves: | 16 (4 valves per cylinder) | |
| Intake/Exhaust duration: | – | |
| Valve head diameter: | INTAKE | 29.300 mm (1.1535 in) |
| EXHAUST | 26.300 mm (1.0354 in) | |
| Valve steam diameter: | INTAKE | 6.000 mm (0.2362 in) |
| EXHAUST | 6.000 mm (0.2362 in) | |
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
- Step 1: 30 Nm (3.1 kgf·m; 22.1 ft·lb)
- Step 2: Turn all bolts 90°
- Step 3: –
- Step 4: Turn all bolts 45°
Maintenance data
| Compression pressure | |
| Standard | 10.0 bar (145 psi) or more |
| Oil system | |
| Oil consumption , L/1000 km (qt. per miles) | Up to 0.7 (1 qt. per 850 miles) |
| Recommended engine oil | SAE 5W-30, 5W-40 |
| Oil type | BMW Lognlife-04 |
| Engine oil capacity (Refill capacity) | 4.25 L (4.49 US. qt, 3.74 Imp. qt.) |
| Ignition system | |
| Spark plug | NGK ZKBR7A-HTU |
Vehicle applications
| Model | Years Produced |
| BMW 116i (E87) | 2007-2009 |
| BMW 316i (E90) | 2008 |
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