BMW M43B16

BMW M43B16The BMW M43B16 is a 1.6 liters (1,596 cc, 97.4 cu·in) straight-four, four-stroke cycle, natural aspirated gasoline engine from the BMW M43-family. The engine was manufactured from 1991 to 2000 at the Steyr engine plant.

The M43B16 engine features a cast-iron cylinder block, a crankshaft with four counterweights and aluminum head with a chain-driven single overhead camshaft (SOHC) and two valves per cylinder (8 in total) with hydraulic tappets. It has an 84.0 mm (3.31 in) cylinder bore and 72.0 mm (2.83 in) piston stroke. Compression ratio rating is 9.7:1.

This engine used a Multi Point Fuel Injection system (MPFI), the Bosch Motronic M 1.7 engine management system and a dual length intake manifold (BMW “DISA”) . Redline is 6,200 rpm.

The BMW M43B16 engine produced 102.0 PS (75 kW; 100.6 HP) at 5,500 rpm of maximum output power and 150 N·m (15.3 kg·m, 110.6 ft·lb) at 3,900 rpm of peak torque. There was also a natural gas-powered (Compressed natural gas, CNG) version for the BMW 316g Compact. This engien version produced 81.6 PS (60 kW; 80.5 HP) at 5,500 rpm of horsepower and 127 N·m (13 kg·m, 93.6 ft·lb) at 3,900 rpm of torque.

The breakdown of the engine code is as follows:

  • M43 – Engine Family
  • B – Gasoline
  • 16 – 1.6 Liter displacement

General information

Engine Specifications
Engine code M43B16
Layout Four stroke, Inline-4 (Straight-4)
Fuel type Gasoline
Production 1991-2000
Displacement 1.6 L, 1,596 cc (97.4 cu in)
Fuel system Multi Point Fuel Injection (MPFI)
Power adder None
Max. horsepower 102.0 PS (75.0 kW; 100.6 HP) at 5,500 rpm
CNG: 81.6 PS (60.0 kW; 80.5 HP) at 5,500 rpm
Max. torque 150.0 N·m (15.3 kg·m, 110.6 ft·lb) at 3,900 rpm
CNG: 127.0 N·m (13 kg·m, 93.6 ft·lb) at 3,900 rpm
Firing order 1-3-4-2
Dimensions (L x H x W):

Cylinder block

Cylinder block
Cylinder block alloy Cast-iron
Compression ratio: 9.7:1
Cylinder bore: 84.0 mm (3.31 in)
Piston stroke: 72.0 mm (2.83 in)
Number of piston rings (compression / oil): 2 / 1
Number of main bearings: 5
Cylinder inner diameter (standard): 84.000-84.014 mm (3.3071-3.3076 in)
Piston skirt diameter (standard): 83.985 mm (3.3065 in)
Piston ring side clearance: Top 0.020-0.200 mm (0.0008-0.0079 in)
Second 0.020-0.100 mm (0.0008-0.0039 in)
Piston ring end gap: Top 0.200-1.000 mm (0.0079-0.0394 in)
Second 0.200-1.000 mm (0.0079-0.0394 in)
Oil 0.400-1.400 mm (0.0157-0.0551 in)
Crankshaft journal diameter: 60.000 mm (2.3622 in)
Crankpin journal diameter: 45.000 mm (1.7717 in)

Cylinder head

Cylinder head
Valve Arrangement: SOHC, chain-driven
Valves: 8 (2 valves per cylinder)
Intake/Exhaust duration:
Valve head diameter: INTAKE 42.000 mm (1.6535 in)
EXHAUST 36.000 mm (1.4173 in)
Valve steam diameter: INTAKE 6.975-7.000 mm (0.2746-0.2756 in)
EXHAUST 6.960-7.000 mm (0.274-0.2756 in)

Maintenance data

Oil system
Recommended engine oil SAE 0W-40, 5W-30, 5W-40
Oil type API SG or SF and better
Engine oil capacity (Refill capacity) 4.0 L (4.23 US. qt, 3.52 Imp. qt.)
Ignition system
Spark plug Bosch FGR7DQP, NGK BKR6EQUP
Spark plug gap: 0.5 mm (0.0197 in)

Vehicle applications

Model Years Produced
BMW 316i (E36) 1993-1999
BMW 316g Compact (E36/5) 1995-2000
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