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BMW M40B16 Engine Specifications

The BMW M40B16 is a 1.6 liters (1,596 cc, 97.4 cubic inches) straight-four, four-stroke cycle, naturally aspirated gasoline engine from the BMW M40-family. The engine was manufactured from 1987 to 1994. The engine features a cast-iron cylinder block, a cast crankshaft with eight counterweights and cross-flow aluminum head with a belt-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. The compression ratio rating is 9.0:1. This engine used a Multi Point Fuel Injection system (MPFI) and the Bosch Motronic M 1.3 engine management system for BMW E30 or Bosch Motronic M 1.7 for BMW E36 model. Redline is 6,200 rpm. The BMW M40B16 engine produced 99.3 PS (73.0 kW; 98.0 HP) at 5,500 rpm of maximum output power and 141 Nm (14.4 kgm, 103.9 ft-lb) at 4,250 rpm of peak torque for BMW 316i (E30) model, or 102.0 PS (75.0 kW; 101.0 HP) at 5,500 rpm of horsepower and 143 Nm (14.6 kgm, 105.4 ft-lb) at 4,250 rpm of torque for BMW 316i (E36).

The breakdown of the engine code is as follows:

M40 - Engine Family
B - Gasoline
16 - 1.6 Liter displacement

• BMW M40B16 Engine Specifications
• BMW M40B16 Engine Troubleshooting

Engine model ..................... M40B16
Cylinder layout ..................... Four stroke, Inline-4 (Straight-4)
Fuel type ..................... Gasoline
Year of production ..................... 1987-1994
Total displacement ..................... 1.6 L, 1,596 cc (97.4 cubic inches)
Fuel system ..................... Multi Point Fuel Injection (MPFI)
Power adder ..................... None
Maximum power ..................... 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
Maximum torque ..................... E30: 141 Nm (14.4 kgm, 103.9 ft-lb) at 4,250 rpm
E36: 143 Nm (14.6 kgm, 105.4 ft-lb) at 4,250 rpm
Firing order ..................... 1-3-4-2
Dimensions (L x H x W) ..................... -
Weight ..................... -

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)
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)
Crankshaft journal diameter ..................... 60.000 mm (2.3622 in)
Crankpin journal diameter ..................... 45.000 mm (1.7717 in)

Valve Arrangement ..................... SOHC, belt-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)

Oil system
Recommended engine oil ..................... SAE 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 F8LCR, Champion C9YCC, NGK ZFR5F-11
Spark plug gap ..................... 0.7-0.9 mm (0.0276-0.0354 in)

BMW 316i (E30) ..................... 1988-1994
BMW 316i (E36) ..................... 1990-1994
Bertone Freeclimber 2 ..................... 1992-1993

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Gasoline and Diesel Engines Technical Data