BMW M10

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The BMW M10 is a straight-4 SOHC piston engine produced from 1962 to 1988 with displacements ranging from 1499 cc to 1990 cc. It was first released in the New Class sedans and began to be phased out following the introduction of the M40 engine in 1987.

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 has a forged crankshaft, counterbalance weights, five main bearings and a chain-driven camshaft. The block is made from cast iron and the head is made from aluminium.

It was also used as the basis for the turbocharged BMW M12 motorsport engine, which was used in the Formula One racing series by Brabham-BMW and others.

Video BMW M10

Development

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 M10 Engine that resulted had a bore and stroke of 82mm by 71mm for a displacemnt of 1499cc. It utilized hemispherical combustion chambers, had an aluminum alloy head, and two large valves per cylinder, 39mm inlets and 35mm exhausts. Power was rated at 80bhp.

BMW have even fairly recently (as of around 2007) redesigned the Banjo bolts that secure the oil feed spray bar to the cylinder head. The M30 and M10 engines became known for camshaft wear when the banjo bolts worked loose, resulting in much decreased and eventually no oil supply. BMW redesigned the Banjo bolts with a slightly different thread pitch as well as dry thread lock - used with new copper sealing washers this eliminates the problem.

Maps BMW M10

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 retroactively known as the "M10" family.

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Models

M115

The 1.5 L (1499 cc/91 in³) M115 produced 75 hp or 80 hp (56 kW or 60 kW), depending on the state of tune. Bore is 82 mm (3.2 in), stroke is 71 mm (2.8 in). Lower power models use an 8:1 compression ratio, while higher power models use a ratio of 8.8:1. Fuel is supplied via a Solex 38 PDSI carburettor.

Applications:

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

M116

The 1.6 L (1573 cc/95 in³) M116 used a Solex 38 PDSI carburettor and produced 63 kW (84 hp). Bore is 84 mm (3.3 in), stroke is 71 mm (2.8 in) and compression ratio is 8.6:1.

Applications:

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

A version using twin Solex 40 PHH carburettors and a compression ratio of 9.5:1 produced 78 kW (105 hp)

Applications:

• 1967-1968 BMW 1600 ti

M41

The 1.6 L (1573 cc/95 in³) M41 produced 67 kW (90 hp) and 123 N?m (91 lb?ft). It has a 8.3:1 compression ratio and fuel is supplied by a Solex 32 DIDTA carburettor.

Applications:

• 1975 E21 316

M98

The 1.6 L (1573 cc/95 in³) M98 produces 55 kilowatts (74 hp). Fuel is supplied by a Pierburg 1B2 carburettor and the compression ratio is 9.5:1.

Applications:

• 1981-1983 E21 315

M118

The 1.8 L (1773 cc/108 in³) M118 produces 66-95 kW (89-127 hp), depending on specification, with bore is 84 mm (3.3 in) and stroke is 80 mm (3.1 in).

Applications:

• 1963-1968 1800: 67 kW (90 hp), 8.6:1 compression, Solex 36-40 PDSI carburettor
• 1974 E12 518: 67 kW (90 hp), 8.6:1 compression, Solex 38 PDSI carburettor
• 1963-1966 1800ti: 81 kW (109 hp), 9.5:1 compression, 2x Solex 40 PHH carburettors
• 1965 1800tiSA: 95 kW (127 hp), 10.5:1 compression, 2x Weber DCOE-45 carburettors

M10B18

The 1.8 L (1766 cc/107 in³) M10B18 produces 74-77 kW (99-103 hp), depending on specification. Bore is 89 mm (3.5 in), stroke is 71 mm (2.8 in).

Applications:

• 1969-1972 1800: 67 kW (90 hp), 8.6:1 compression, Solex 36-40 PDSI carburettor
• 1971-1975 BMW 1802: 67 kW (90 hp), 8.6:1 compression, Solex 38 PDSI carburettor
• 1980-1983 E21 320i/320is (USA): 74 kW (99 hp), 8.8:1 compression, Bosch K-Jetronic MFI
• 1980-1983 E12 518 (South Africa): 77 kW (103 hp), 10:1 compression, Bosch K-Jetronic MFI
• 1982-1987 E30 318i: 77 kW (103 hp), 10:1 compression, Bosch L-Jetronic EFI
• 1981-1988 E28 518i: 77 kW (103 hp), 9.5:1 compression, Bosch LE-Jetronic MFI

M05

The 2.0 L (1990 cc/121 in³) M05 has a bore of 89 mm and a stroke of 80 mm. It produces 75-89 kW (101-119 hp), depending on specification.

Applications:

• 1965-1970 BMW 2000CS: 89 kW (119 hp), 9.3:1 compression, 2x Solex 40 PHH carburettors
• 1966-1970 BMW 2000C: 75 kW (101 hp), 8.5:1 compression, Solex 40 PDSI carburettor
• 1966-1972 BMW 2000: 75 kW (101 hp), 8.5:1 compression, Solex 40 PDSI carburettor
• 1966-1971 BMW 2000ti: 89 kW (119 hp), 9.3:1 compression, 2x Solex 40 PHH carburettors
• 1968-1976 BMW 2002: 75 kW (101 hp), 8.5:1 compression, Solex 40 PDSI carburettor

M17

The 2.0 L (1990 cc/121 in³) M17 produces 85 kW (114 hp). It has a Stromberg 175 CDET carburettor and a compression ratio of 9.0:1.

Applications:

• 1972-1977 E12 520

M15

The 2.0 L (1990 cc/121 in³) M15 used the Kugelfischer mechanical fuel injection and produced 97 kW (130 hp). It was the famed tii engine.

Applications:

• 1970-1973 2000tii
• 1972-1974 2002tii
• 1972-1974 E12 520i

M43

The 2.0 L (1990 cc/121 in³) M43/1 has a compression ratio of 8.1:1 and produces 80 kW (107 hp).

Applications:

• 1975-1979 E21 320 (Solex 32-32 DIDTA carburettor)
• 1975-1979 E21 320i (USA only, Bosch K-Jetronic MFI)

M64

The 2.0 L (1990 cc/121 in³) M64 has a compression ratio of 9.3:1, uses K-Jetronic fuel injection and produces 93 kW (125 hp).

Applications:

• 1975-1978 E21 320i
• 1975-1979 E12 520i

M31

The 2.0 L (1990 cc, 121 in³) M31 used a KKK turbocharger and Kugelfischer P04 mechanical fuel injection with a sliding throttle plate. It has a compression ratio of 6.9:1 and produces 125 kW (168 hp).

Applications:

• 1973-1975 2002 turbo

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Performance variants

M12 turbocharged motorsport version

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

S14 version

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

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References

Source of article : Wikipedia