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BMW M40B18 Engine Specifications
The BMW M40B18 is a 1.8 liters (1,796 cc, 109.6 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. Cylinder bore and piston stroke are 84.0 mm (3.31 in) and 81.0 mm (3.19 in), respectively. Compression ratio rating is 8.8:1. 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 M40B18 engine produced 113.0 PS (83.0 kW; 111.0 HP) at 5,500 rpm of maximum output power and 162 Nm (16.5 kgm, 119.4 ft-lb) at 4,250 rpm of peak torque for BMW 318i (E30) model, or 115.6 PS (85.0 kW; 114.0 HP) at 5,500 rpm of horsepower and 165 Nm (16.8 kgm, 121.6 ft-lb) at 4,250 rpm of torque for BMW 318i (E36).
Engine code identification:
M40 - Engine Family
B - Gasoline
18 - 1.8 Liter displacement
| GENERAL TECHNICAL DATA |
Engine model ..................... M40B18
Cylinder layout ..................... Four stroke, Inline-4 (Straight-4)
Fuel type ..................... Gasoline
Year of production ..................... 1987-1994
Total displacement ..................... 1.8 L, 1,796 cc (109.6 cubic
inches)
Fuel system ..................... Multi Point Fuel Injection (MPFI)
Power adder ..................... None
Maximum power ..................... E30: 113.0 PS (83.0 kW; 111.0 HP) at
5,500 rpm
E36: 115.6 PS (85.0 kW; 114.0 HP) at 5,500 rpm
Maximum torque ..................... E30: 162 Nm (16.5 kgm, 119.4 ft-lb)
at 4,250 rpm
E36: 165 Nm (16.8 kgm, 121.6 ft-lb) at 4,250 rpm
Firing order ..................... 1-3-4-2
Dimensions (L x H x W) ..................... -
Weight ..................... -
| CYLINDER BLOCK |
Cylinder block alloy ..................... Cast-iron
Compression ratio ..................... 8.8:1
Cylinder bore ..................... 84.0 mm (3.31 in)
Piston stroke ..................... 81.0 mm (3.19 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)
| CYLINDER HEAD |
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)
| MAINTENANCE DATA |
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)
| VEHICLE APPLICATIONS |
BMW 318i (E30) ..................... 1987-1994
BMW 318i (E36) ..................... 1992-1993
BMW 518i (E34) ..................... 1989-1994
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