The BMW M10/M12 was an I4 piston engine produced from 1961 to 1983. Displacement ranged from 1499cc to 1990cc.

The engine was designed by Baron Alex von Falkenhausen , noted engineer and race driver. von Falkenhausen was asked to design a small-displacement (1.3 L) engine, but he felt that this would be insufficient for the company's future needs. Therefore, he designed a block that could be expanded to 2.0 L and delivered it at 1.5 L. The design was very successful, with over 3.5 million produced, and it served the company for over 20 years.

M115

The 1.5 L (1499 cc) M115 produced 75 or 80 hp (56 or 60 kW) (depending on carburetor) and 118 ft.lbf (160 Nm).

Applications:

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

M118

The 1.8 L (1773 cc) M118 produced 90 to 130 hp (67 to 97 kW) and 143 to 150 ft.lbf (194 to 203 Nm).

Applications:

• 1963-1974 BMW 1800
• 1974 E12 518

M116

The 1.6 L (1573 cc) M116 produced 75 to 105 hp (56 to 78 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) M05 produced 100 to 120 hp (75 to 90 kW) and 157 to 167 ft.lbf (213 to 226 Nm). Bore was 89 mm and stroke was 80 mm.

Applications:

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

M15

The 2.0 L (1990 cc) M15 produced 130 hp (97 kW) and 177 ft.lbf (240 Nm). It was the famed tii engine.

Applications:

• 1968-1976 BMW 2002tii

M17

The 2.0 L (1990 cc) M17 produced 115 hp (86 kW) and 162 ft.lbf (220 Nm).

Applications:

• 1972 E12 520

M31

The 2.0 L (1990 cc) M31 was turbocharged and produced 170 hp (127 kW) and 240 ft.lbf (325 Nm).

Applications:

• 1974 E20 2002 turbo

M41

The 1.6 L (1573 cc) M41 produced 90 hp (67 kW) and 123 ft.lbf (167 Nm).

Applications:

• 1975 E21 316

M64

The 2.0 L (1990 cc) M41 produced 125 hp (93 kW) and 172 ft.lbf (233 Nm).

Applications:

• 1975 E21 320i
• 1975 E12 520i

M43/1

The 2.0 L (1990 cc) M43/1 produced 109 hp (81 kW) and 157 ft.lbf (213 Nm).

Applications:

• 1975 E21 320

M42

The 1.8 L (1766 cc) M41 produced 98 hp (73 kW) and 142 ft.lbf (193 Nm).

Applications:

• 1975 E21 318
• 1976 E12 518

M98

The 1.6 L (1573 cc) M41 produced 75 hp (56 kW) and 110 ft.lbf (149 Nm).

Applications:

• 1981 E21 315

M10B18

The 1.8 L (1766 cc) M41 (also known as the M98) produced 90 hp (67 kW) and 137 ft.lbf (186 Nm).

Applications:

• 1980 E12 518
• 1980 E21 316
• 1980 E28 518
• 1980 E21 318i
• 1980 E30 318i
• 1980 E28 518i
• 1983 E30 316
• 1983 E28 518

See also

• BMW World