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  • BMW M40 Engine (1987-1995)
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History

BMW M40 Straight-4 engine 

 
BMW M40 Straight-4 engine  From  1987 to 1995
Production period: 1987-1994
Manufacturer: BMW
How it works: Otto
Engine Type: R4
Valve control: OHC
displacement: 1596-1795 cm 3
Fuel supply: manifold injection
Engine charging: none
Power: 73-85 kW
Previous model: M10
Successor: M43

 

The BMW M40 is an inline-four SOHC piston engine which replaced the M10 and was produced from 1987–1995.

The M40 is a water-cooled four-cylinder gasoline engine with a crankcase made of gray cast iron . The cylinder spacing is 91 mm. 

The engine has a cast crankshaft with eight counterweights.  The cross-flow cylinder head consists of chill casting. The overhead, belt driven five bearings camshaft of the engine is made of chilled cast iron manufactured and operated per cylinder via drag levers each an inclined by 14 ° inlet and an outlet; the intake valve discs are 42 mm larger than the 36 mm exhaust valves. They have a hydraulic valve clearance compensation. Furthermore, the camshaft of the BMW M40, although made of shell-molded, is susceptible to "shrinkage", which is caused by the direct sliding of the drag levers on the camshaft. Mixture preparation is carried out by means of intake manifold injection ,  which is controlled by the Bosch Motronic M 1.3.  It contains the Lamba probe for the regulated three-way catalyst . Note: The four-valve version is the BMW M42 . 

Displacement ranges from 1.6 L (1596 cc; 97.4 cu in) to 1.8 L(1796 cc; 109.6 cu in). It began to be replaced by the M43 SOHC engine in 1991, however from 1989 the M40 was produced alongside the higher performance M42 DOHC four-cylinder engine.

Compared with its M10 predecessor, the M40 uses a belt-driven camshaft, and hydraulic tappets. Like the M10, the M40 uses an iron block and an aluminium head.

Fuel injection for the E30 versions is Bosch Motronic 1.3, and the E36 versions use Motronic 1.7.

engine type capacity Bore × stroke Valves / cyl. compression Power at 1 / min Torque at 1 / min Maximum speed catalyst fuel construction time
M40B16 1596 cm3 84 mm × 72 mm 2 9.0: 1 73 kW (100 hp) at 5500 141 Nm at 4250 6200 min-1 Yes 91 RON 1988-1994
M40B16 1596 cm3 84 mm × 72 mm 2 9.0: 1 75 kW (102 hp) at 5500 143 Nm at 4250 6200 min-1 No 91 RON 1988-1994
M40B18 1795 cm3 84 mm × 81 mm 2 8.8: 1 83 kW (113 hp) at 5500 162 Nm at 4250 6200 min-1 Yes 91 RON 1987-1994
M40B18 1795 cm3 84 mm × 81 mm 2 8.8: 1 85 kW (115 hp) at 5500 165 Nm at 4250 xxxx min-1 No 91 RON
Engine Displacement Power Torque Redline Year
M40B16
E30 version
1,596 cc (97.4 cu in) 75 kW (101 hp)
@ 5,500 rpm
143 N·m (105 lb·ft)
@ 4,250 rpm
6200 1987
M40B16
E36 version
73 kW (98 hp)
@ 5,500 rpm
141 N·m (104 lb·ft)
@ 4,250 rpm
6200 1991
M40B18
E30 version
1,796 cc (109.6 cu in) 85 kW (114 hp)
@ 5,500 rpm
165 N·m (122 lb·ft)
@ 4,250 rpm
6200 1987
M40B18
E36 version
83 kW (111 hp)
@ 5,500 rpm
162 N·m (119 lb·ft)
@ 4,250 rpm
6200 1991

M40B16

BMW M40 Straight-4 engine m40b16

The M40B16 is a 1.6 L (1,596 cc) version of the M40, which has a bore of 84 mm (3.3 in) and a stroke of 72 mm (2.8 in). It produces 102 hp (76 kW) and 105 lb·ft (142 N·m) of torque. The E30 version uses Bosch Motronic 1.3 fuel injection, while the E36 version uses Motronic 1.7.

Applications:

  • 1988–1994 E30 316i
  • 1990–1994 E36 316i
  • 1992–1993 Bertone Freeclimber 2

M40B18

BMW M40 Straight-4 engine m40b18

The M40B18 is a 1.8 L (1,796 cc) version of the M40, which has a bore of 84 mm (3.3 in) and a stroke of 81 mm (3.2 in). It produces 113 hp (84 kW) and 120 lb·ft (160 N·m) of torque. Like the M40B16, the fuel injection system is Bosch Motronic 1.3 for the E30 versions and Motronic 1.7 for the E36.

Applications:

  • 1987–1994 E30 318i
  • 1988–1994 E34 518i
  • 1992–1993 E36 318i

Technical

  • BMW M40 Engine Technical details and specifications (1987-1995)

    Engine M40B16 BMW 3 Series (E30) 1.6L 316i

    No. of cylinders /OHC
    Capacity 1596 cc
    Firing order 1-3-4-2
    Compression ratio 9.0:1
    Suitable for unleaded petrol es
    Fuel system make Bosch Motronic M1.3
    Diagnostic socket Yes
    Ignition coil Make Bosch Type 0 221 118 335
    Distributor Make Bosch
    Fuel system pressure 2.94-3.06bar
    Injector 15-17.5 Ohm
    Oil pressure 4.0-4.3 bar
    Thermostat opens 88°C

    © Motor car History

     

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Advanced Maintenance and Service Guides to download and save

Service

  • BMW M40 Engine Service Guide (1987-1995)


     
    Engine M40B16 BMW 3 Series (E30) 1.6L 316i
     
    Spark plugs Electrode gap 0.7-0.9mm
    Spark plugs Original equipment Bosch F8LCR
    Spark plugs Make Champion C9YCC
    Spark plugs Make NGK ZFR5F-11
    Valve clearance -INLET Hydraulic
    Valve clearance -EXHAUST Hydraulic
    Drive belt size - alternator 9,5x1013mm
    Drive belt size - PAS/AC 9.5x810 mm
    Drive belt tension - alternator/PAS/AC 10mm
    Engine oil grade - Normal/moderate climate 10W/40 SAE or 10W/40 SAE Synthetic
    Engine oil grade - cold climate 5W/30 SAE
    Engine oil grade - hot climate 20W/50 SAE
    Engine oil change 4.0 litres
    Tighten oil Sump drain bolt 32 Nm
    Cooling system 7.0 litres
    Brake fluid Type DOT 4

    © Motor car History

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