The BMW M40B16 is a 1.6 L (1,596 cc, 97.4 cu·in) straight-four natural aspirated four-stroke liquid-cooled internal combustion gasoline engine, manufactured by Bayerische Motoren Werke AG from 1987 to 1994.
A 84.0 mm (3.31 in) cylinder bore and 72.0 mm (2.83 in) piston stroke give the M40B16 engine a total of 1,596 cc of displacement. The compression ratio rating is 9.0:1.
The BMW M40B16 engine produced 99.3 PS (73.0 kW; 98.0 HP) at 5,500 rpm of maximum output power and 141 N·m (14.4 kg·m, 103.9 ft·lb) at 4,250 rpm of peak torque for E30 model, or 102.0 PS (75.0 kW; 101.0 HP) at 5,500 rpm of horsepower and 143 N·m (14.6 kg·m, 105.4 ft·lb) at 4,250 rpm of torque for E36 model.
The BMW M40B16 features:
- Belt-driven single overhead camshaft (SOHC)
- 8 valves with hydraulic tappets
- Cast-iron cylinder block
- Crankshaft with eight counterweights
- Multi Point Fuel Injection (MPFI)
- Bosch Motronic M 1.3 or Bosch Motronic M 1.7 engine management system
- Pressurized lubrication system
- Liquid-cooled cooling system
General information
| Engine Specifications | |
| Engine model | M40B16 |
| Engine type | 4-stroke, SOHC, inline-4 |
| Displacement | 1.6 L, 1,596 cm3, (97.4 cu·in) |
| Max. horsepower | E30: 99.3 PS (73.0 kW; 98.0 HP) at 5,500 rpm E36: 102.0 PS (75.0 kW; 101.0 HP) at 5,500 rpm |
| Max. torque | E30: 141 N·m (14.4 kg·m, 103.9 ft·lb) at 4,250 rpm E36: 143 N·m (14.6 kg·m, 105.4 ft·lb) at 4,250 rpm |
| Cooling system | Liquid-cooled |
| Lubricating system | Pressurized lubrication |
| Fuel system | Multi Point Fuel Injection (MPFI) |
| Engine management system | E30: Bosch Motronic M 1.3 E36: Bosch Motronic M 1.7 |
| 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: | 9.0:1 |
| Cylinder bore: | 84.0 mm (3.31 in) |
| Piston stroke: | 72.0 mm (2.83 in) |
| Cylinder internal diameter (standard): | 84.000-84.014 mm (3.3071-3.3076 in) |
| Piston skirt outer diameter (standard): | 83.985 mm (3.3065 in) |
| Number of piston rings (compression / oil): | 2/1 |
| Connecting rod small end diameter (standard): | 22.005-22.012 mm (0.8663-0.8666 in) |
| Piston pin diameter: | 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) |
| Cylinder head | |
| Cylinder head alloy: | Aluminium |
| Valve arrangement: | SOHC, belt driven |
| Valves: | 2 ,(8 valves in total) |
| Head height: | 141.000 mm (5.5512 in) |
| Intake valve duration: | 244° |
| Exhaust valve duration: | 244° |
| Valve head diameter (INTAKE): | 42.000 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) |
| Valve lift (INTAKE): | 10.6 mm (0.4173 in) |
| Valve lift (EXHAUST): | 10.6 mm (0.4173 in) |
Service Data
| 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.) |
| Ignition system | |
| Spark plug: | Bosch F8LCR, Champion C9YCC, NGK ZFR5F-11 |
| Spark plug gap: | 0.7-0.9 mm (0.0276-0.0354 in) |
Applications
| Model | Years Produced |
| BMW 316i (E30) | 1988–1994 |
| BMW 316i (E36) | 1990–1994 |
| Bertone Freeclimber 2 | 1992–1993 |
References
1. BMW TIS (Technical Information System)
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