BMW M10

BMW M10
BMW M10 engine inside
Overview
Manufacturer	BMW
Production	1962–1988
Combustion chamber
Configuration	SOHC Straight-4
Chronology
Successor	BMW M40

The BMW M10 was a straight-4 SOHC piston engine produced from 1962 to 1988 with displacements ranging from 1499 cc to 1990 cc. The engine was a commercial success for the Bavarian carmaker, with over 3.5 million produced in almost three decades across many BMW models. It was also used as the basis for the turbocharged BMW M12 motorsport engine, which for instance was used by Brabham-BMW in the Formula One racing series.

History

The engine was designed by engineer and race driver Baron Alex von Falkenhausen. In the late 1950s, he was asked to design a small-displacement (1.3 L) engine, but felt that this would be insufficient for the company's future needs. Therefore, he convinced BMW that the capacity should be 1.5 L instead and he designed a block that could be expanded to 2.0 L in the future.

The BMW M40 series of engines replaced the M10 in the late 1980s.

Models

Model	Displacement	Power	Torque	Redline	Year
M115	1,499 cc (91.5 cu in)	56–60 kW (76–82 PS; 75–80 hp)			1962–1977
M98	1,573 cc (96.0 cu in)	56 kW (76 PS; 75 hp)	149 N⋅m (110 lb⋅ft)		1981
M118	1,766 cc (107.8 cu in)	67 kW (91 PS; 90 hp)	150 N⋅m (111 lb⋅ft)		1963–1973
M41	1,573 cc (96.0 cu in)	67 kW (91 PS; 90 hp)	167 N⋅m (123 lb⋅ft)		1975
M10	1,766 cc (107.8 cu in)	73 kW (99 PS; 98 hp)			1964–1975
M10B18	1,766 cc (107.8 cu in)	75 kW (102 PS; 101 hp) @ 5,800 rpm	140 N⋅m (103 lb⋅ft) @ 4,500 rpm		1985–1988
M10B18	1,766 cc (107.8 cu in)	77 kW (105 PS; 103 hp) @ 5,800 rpm	145 N⋅m (107 lb⋅ft) @ 4,500 rpm		1980
M116	1,573 cc (96.0 cu in)	78 kW (106 PS; 105 hp)			1964–1975
M43/1	1,990 cc (121.4 cu in)	81 kW (110 PS; 109 hp)			1975
M17	1,990 cc (121.4 cu in)	86 kW (117 PS; 115 hp)			1972
M05	1,990 cc (121.4 cu in)	90 kW (122 PS; 121 hp)	167 N⋅m (123 lb⋅ft)		1965–1976
M64	1,990 cc (121.4 cu in)	93 kW (126 PS; 125 hp)			1964–1975
M15	1,990 cc (121.4 cu in)	96 kW (131 PS; 129 hp)	177 N⋅m (131 lb⋅ft)		1972–1974
M31	1,990 cc (121.4 cu in) turbocharged	125 kW (170 PS; 168 hp)	240 N⋅m (177 lb⋅ft)		1974

Naming conventions

The engine was initially known as the "M115" (the last two digits representing the 1.5 litre capacity). Over the years, variants of the engine were given various codes (most of them starting with "M1..." and the remaining digits relating to the capacity). In 1975, the engine became known as then "M10", then in 1980 it was given the standardised BMW engine code of M10B18 (where "M10" represents the series and the "18" represents the 1.8 litre capacity).

The M115 and all related engines have become retrospectively known as the "M10" family.

M115

The 1.5 L (1499 cc/91 in³) M115 produced 75 hp or 80 hp (56 kW or 60 kW) (depending on carburetor).

Applications:

• 1962-1964 BMW 1500
• 1975-1977 BMW 1502

M118

The 1.8 L (1773 cc/108 in³) M118 produced 90 hp (67 kW) and 143 to 150 Nm of torque.

Applications:

• 1963-1974 BMW 1800
• 1974 E12 518

M116

The 1.6 L (1573 cc/95 in³) M116 produced 75 hp (56 kW). Bore was 84 mm and stroke was 71 mm.

Applications:

• 1964-1966 BMW 1600
• 1966-1975 BMW 1600-2/1602

M05

The 2.0 L (1990 cc/121 in³) M05 produced 100 hp to 120 hp (75 to 90 kW) and 157 to 167NM of torque . Bore was 89 mm and stroke was 80 mm.

Applications:

• 1965-1969 BMW 2000C
• 1966-1972 BMW 2000
• 1968-1976 BMW 2002

M15

The 2.0 L (1990 cc/121 in³) M15 produced 130 hp (96 kW) and 131 lb·ft (177 N·m). It was the famed tii engine.

Applications:

• 1972-1974 BMW 2002tii

M17

The 2.0 L (1990 cc/121 in³) M17 produced 115 hp (86 kW).

Applications:

• 1972 E12 520

M31

The 2.0 L (1990 cc/121 in³) M31 was turbocharged and produced 170 hp (125 kW) and 177 lb·ft (250 N·m).

Applications:

• 1974 E20 2002 turbo

M41

The 1.6 L (1573 cc/95 in³) M41 produced 90 hp (67 kW) and 123 lb·ft (167 N·m).

Applications:

• 1975 E21 316

M64

The 2.0 L (1990 cc/121 in³) M64 produced 125 hp (93 kW).

Applications:

• 1975 E21 320i
• 1975 E12 520i

M43/1

The 2.0 L (1990 cc/121 in³) M43/1 produced 109 hp (81 kW).

Applications:

• 1975 E21 320

M10

The 1.8 L (1766 cc/107 in³) M10 produced 98 hp (73 kW).

Applications:

• 1975 E21 318
• 1976 E12 518

M98

The 1.6 L (1573 cc/95 in³) M98 produced 75 hp (56 kW) and 110 lb·ft (149 N·m).

Applications:

• 1981 E21 316

M10B18

• L-Jetronic Fuel Injection
• Displacement 107.8 CI 1,766 cc
• 101 hp (75 kW) @5,800 rpm
• 103 lb·ft (140 Nm) @4,500 rpm
• Compression: 9.0:1
• Stroke 2.79 in (71 mm)
• Bore 3.50 in (89 mm)
• Firing order 1, 3, 4, 2

Applications:

• 1980 E12 518
• 1980 E21 316
• 1980 E28 518
• 1981 E12/8 518i (South Africa Only)
• 1980 E21 318i
• 1983 E30 318i
• 1980 E28 518i
• 1983 E30 316
• 1983 E28 518
• 1987/1988 E30 316i

M10B18 had an 89 mm bore and 71 mm stroke. Also, in E30 as 318i, very unusual for that time, it could stretch the 2nd gear all the way to 100 km/h.

Performance variants

M12 turbocharged motorsport version

Main article: BMW M12

The M10 was used as the basis for the highly successful M12 turbocharged motorsport engine.

S14 version

Main article: BMW S14

The S14 engine for the E30 BMW M3 was based upon the M10 block.

External links

• The UnixNerd's BMW M10 engine page with photos, history and common problems.