The BMW M43TU or M43B19 is a 1.9 L (1,895 cc, 115.6 cu·in) straight-four natural aspirated four-stroke liquid-cooled internal combustion gasoline engine, manufactured by Bayerische Motoren Werke AG from 1998 to 2002.
It has an 85.0 mm (3.35 in) cylinder bore and 83.5 mm (3.29 in) piston stroke. The compression ratio rating is 9.7:1.
The BMW M43TU engine produced 105.0 PS (77.0 kW; 103.0 HP) at 5,300 rpm of maximum output power and 165.0 N·m (16.8 kg·m, 121.6 ft·lb) at 2,500 rpm of peak torque for the M43TUB19 UL engine version, or 118.0 PS (87.0 kW; 117.0 HP) at 5,500 rpm of horsepower and 180.0 N·m (18.4 kg·m, 132.7 ft·lb) at 3,900 rpm of torque for the M43TUB19 OL engine version.
The BMW M43BTU features:
- Chain-driven single overhead camshaft (SOHC)
- 8 valves with hydraulic tappets
- Cast-iron cylinder block
- Crankshaft with four counterweights
- Multi Point Fuel Injection (MPFI)
- Bosch BMS 46 engine management system
- Dual length intake manifold (BMW “DISA”)
- Camshaft position sensor and a knock sensor
- Pressurized lubrication system
- Liquid-cooled cooling system
General information
| Engine Specifications | |
| Engine model | M43TU or M43B19 |
| Engine type | 4-stroke, SOHC, inline-4 |
| Displacement | 1.9 L, 1,895 cm3, (115.6 cu·in) |
| Max. horsepower | M43TUB19 UL: 105.0 PS (77.0 kW; 103.0 HP) at 5,300 rpm M43TUB19 OL: 118.0 PS (87.0 kW; 117.0 HP) at 5,500 rpm |
| Max. torque | M43TUB19 UL: 165.0 N·m (16.8 kg·m, 121.6 ft·lb) at 2,500 rpm M43TUB19 OL: 180.0 N·m (18.4 kg·m, 132.7 ft·lb) at 3,900 rpm |
| Cooling system | Liquid-cooled |
| Lubricating system | Pressurized lubrication |
| Fuel system | Multi Point Fuel Injection (MPFI) |
| Engine management system | Bosch BMS 46 |
| 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: | Cast-iron |
| Compression ratio: | 9.7:1 |
| Cylinder bore: | 85.0 mm (3.35 in) |
| Piston stroke: | 83.5 mm (3.29 in) |
| Cylinder internal diameter (standard): | 85.000-85.014 mm (3.3465-3.347 in) |
| Piston skirt outer diameter (standard): | 84.985 mm (3.3459 in) |
| Number of piston rings (compression / oil): | 2/1 |
| Connecting rod big end diameter (standard): | 48.000-48.016 mm (1.8898-1.8904 in) |
| Connecting rod small end diameter (standard): | 22.005-22.012 mm (0.8663-0.8666 in) |
| Connecting rod center distance: | 22.000 mm (0.8661 in) |
| Side clearance (Top): | 0.020-0.200 mm (0.0008-0.0079 in) |
| Side clearance (Second): | 0.020-0.100 mm (0.0008-0.0039 in) |
| Ring end gap (Top): | 0.200-1.000 mm (0.0079-0.0394 in) |
| Ring end gap (Second): | 0.200-1.000 mm (0.0079-0.0394 in) |
| Number of main bearings: | 5 |
| Crankshaft main journal diameter: | 60.000 mm (2.3622 in) |
| Crankpin journal diameter: | 45.000 mm (1.7717 in) |
| Crankshaft center distance: | 36 mm (1.415 in) |
| Cylinder head | |
| Cylinder head alloy: | Aluminium |
| Valve arrangement: | SOHC, chain-driven |
| Valves: | 2,(8 valves in total) |
| Head height: | 140.550-141.000 mm (5.5335-5.5512 in) |
| Valve head diameter (INTAKE): | 42.00 mm (1.6535 in) |
| Valve head diameter (EXHAUST): | 36.000 mm (1.4173 in) |
| Valve steam diameter (INTAKE): | 6.975-7.000 mm (0.2746-0.2756 in) |
| Valve steam diameter (EXHAUST): | 6.960-7.000 mm (0.274-0.2756 in) |
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: | API SG or SF and better |
| Recommended oil: | SAE 10W-40, 5W-30 |
| Oil capacity: | 4.0 L (4.23 US. qt, 3.52 Imp. qt.) |
| Oil pressure: | 0.5 bar (0.51 kg/cm3; 7.25 psi) at Idle speed 4.3 bar (4.3 kg/cm3; 64.4 psi) at Rated speed |
| Ignition system | |
| Spark plug | Bosch FGR7DQP, NGK BKR6EQUP |
| Spark plug gap: | 0.5 mm (0.0197 in) |
Applications
| Model | Years Produced |
| M43TUB19 UL | |
| BMW 316i Compact (E36) | 1999-2001 |
| BMW 316i (E46) | 1999-2002 |
| M43TUB19 OL | |
| BMW 318i/318Ci (E46) | 1998-2001 |
| BMW Z3 1.9 | 1999-2002 |
References
1. BMW TIS (Technical Information System)
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