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The BMW M10 is an SOHC four-cylinder petrol engine which was produced from 1962-1988. It BMW's first four-cylinder engine since the BMW 309 ended production in 1936 and was introduced in the New Class sedans.

BMW M10 engine
BMW Engine M10.JPG
Overview
Production1962–1988
Layout
ConfigurationInline-4
Displacement1.5–2.0 L (92–122 cu in)
Block materialCast iron
Head materialAluminium
ValvetrainSOHC
Combustion
Fuel typePetrol
Chronology
PredecessorNone
SuccessorBMW M40

Over 3.5 million M10 engines were produced during the M10's 26 year production run, and it was used in many BMW models.[1]

The turbocharged BMW M12 engine— used in the Formula One racing— was based on the M10 engine block and produced up to 1,044 kW (1,400 bhp) in qualifying trim.

Following the introduction of the BMW M40 engine in 1987, the M10 began to be phased out.

Contents

DevelopmentEdit

Baron Alex von Falkenhausen— an engineer and racing driver— designed the M10 .[1] In the late 1950s, he was asked to design an engine with a displacement of 1.3 L (79 cu in), however he felt that this would be insufficient for the company's future needs. Therefore, he convinced BMW that the capacity should be 1.5 L (92 cu in) instead and he designed a block that could be expanded to 2.0 L (122 cu in) in the future.

DesignEdit

The M10 has a forged crankshaft, counterbalance weights, five main bearings and a chain-driven camshaft.[2] The block is made from cast iron and the head is made from aluminium.[3] The initial version of the M10 had a bore of 82 mm (3.2 in) and a stroke of 71 mm (2.8 in), resulting in a displacement of 1,499 cc (91.5 cu in). It had hemispherical combustion chambers, an aluminum alloy head and two valves per cylinder. The peak power rating was 80 bhp (60 kW).[4]

Naming conventionsEdit

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, B represents petrol (Benzin in German) and the "18" represents the 1.8–litre capacity).

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

VersionsEdit

Version Displacement Power Torque Year
M115 1,499 cc (91.5 cu in) 56 kW (75 bhp)
at 5,800 rpm
118 N⋅m (87 lb⋅ft)
at 3,700 rpm
1974–1977
60 kW (80 bhp)
at 5,700 rpm
118 N⋅m (87 lb⋅ft)
at 3,000 rpm
1962-1964
M116 1,573 cc (96.0 cu in) 63 kW (84 bhp)
at 5,800 rpm
130 N⋅m (96 lb⋅ft)
at 3,500 rpm
1964–1975
78 kW (105 bhp)
at 6,000 rpm
141 N⋅m (104 lb⋅ft)
at 4,500 rpm
1967–1968
M41 66 kW (89 bhp)
at 6,000 rpm
167 N⋅m (123 lb⋅ft)
at 4,000 rpm
1975-1980
M98 55 kW (74 bhp)
at 5,800 rpm
110 N⋅m (81 lb⋅ft)
at 3,200 rpm
1981-1983
M118 1,766 cc (107.8 cu in) 67 kW (90 bhp)
at 5,250 rpm
144 N⋅m (106 lb⋅ft)
at 3,000 rpm
1963–1974
81 kW (109 bhp)
at 5,800 rpm
148 N⋅m (109 lb⋅ft)
at 4,000 rpm
1964–1976
97 kW (130 bhp)
at 6,100 rpm
157 N⋅m (116 lb⋅ft)
at 5,100 rpm
1964-1965
M10B18 74 kW (99 bhp)
at 5,800 rpm
135 N⋅m (100 lb⋅ft)
at 3,500 rpm
1980-1983
77 kW (103 bhp)
at 5,800 rpm
145 N⋅m (107 lb⋅ft)
at 4,500 rpm
1980–1988
M05 1,990 cc (121.4 cu in) 75 kW (101 bhp)
at 5,500 rpm
157 N⋅m (116 lb⋅ft)
at 3,000 rpm
1968–1976
89 kW (119 bhp)
at 5,600 rpm
167 N⋅m (123 lb⋅ft)
at 3,500 rpm
1965–1971
M17 84 kW (113 bhp)
at 5,800 rpm
165 N⋅m (122 lb⋅ft)
at 3,700 rpm
1972-1977
M15 97 kW (130 bhp)
at 5,800 rpm
177 N⋅m (131 lb⋅ft)
at 4,500 rpm
1970–1974
M43 80 kW (107 bhp)
at 5,800 rpm
160 N⋅m (118 lb⋅ft)
at 3,700 rpm
1975-1983
M64 92 kW (123 bhp)
at 5,700 rpm
175 N⋅m (129 lb⋅ft)
at 4,350 rpm
1975-1979
M10B20 81 kW (109 bhp)
at 5,700 rpm
152 N⋅m (112 lb⋅ft)
at 4,350 rpm
1977-1979
M31 1,990 cc (121.4 cu in)
turbo
125 kW (168 bhp)
at 5,800 rpm
245 N⋅m (181 lb⋅ft)
at 4,000 rpm
1973-1975

1,499 cc enginesEdit

The M115 version has a displacement of 1,499 cc (91.5 cu in) and produces 56–60 kW (75–80 bhp). It has a bore of 82 mm (3.2 in) and a stroke of 71 mm (2.8 in). Lower power models have a compression ratio of 8.0:1, while higher power models have a compressions ratio of 8.8:1. Fuel is supplied via a Solex 38 PDSI carburettor.

Applications:[5][6]

1,573 cc enginesEdit

The M116 version has a displacement of 1,573 cc (96.0 cu in) and produces 63–78 kW (84–105 bhp). It has a bore of 84 mm (3.3 in) and a stroke of 71 mm (2.8 in). The standard specification has a compression ratio of 8.6:1 and uses a Solex 38 PDSI carburettor. The 1600 ti version has a compression ratio of 9.5:1 and uses twin Solex 40 PHH carburettors.

Applications:

The M41 version produces 66 kW (89 bhp), has an 8.3:1 compression ratio and fuel is supplied by a Solex 32 DIDTA carburettor.

Applications:

The M98 version produces 55 kW (74 bhp), has a compression ratio of 9.5:1 and uses a Pierburg 1B2 carburettor.

Applications:[7]

  • 1981-1983 E21 315

1,766 cc enginesEdit

The M118 version has a displacement of 1,766 cc (107.8 cu in) and produces 66–97 kW (89–130 bhp),[8] depending on specification. The bore is 84 mm (3.3 in) and the stroke is 80 mm (3.1 in).

Applications:[9]

  • 1963-1968 1800— 67 kW (90 bhp), 8.6:1 compression, Solex 36-40 PDSI carburettor
  • 1963-1966 1800ti— 81 kW (109 bhp), 9.5:1 compression, twin Solex 40 PHH carburettors
  • 1964-1965 1800tiSA— 95 kW (127 bhp), 10.5:1 compression, twin Weber DCOE-45 carburettors
  • 1974-1981 E12 518— 66 kW (89 bhp), 8.6:1 compression, Solex 38 PDSI carburettor

The M10B18 version produces 74–77 kW (99–103 bhp), depending on specification. The bore is 89 mm (3.5 in) and the stroke is 71 mm (2.8 in).

Applications:

  • 1969-1972 1800— 67 kW (90 bhp), 8.6:1 compression, Solex 36-40 PDSI carburettor
  • 1971-1975 1802— 67 kW (90 bhp), 8.6:1 compression, Solex 38 PDSI carburettor
  • 1980-1983 E21 320i/320is— U.S. only, 74 kW (99 bhp), 8.8:1 compression, Bosch K-Jetronic mechanical fuel injection
  • 1980-1983 E12 518— South Africa only, 77 kW (103 bhp), 10.0:1 compression, Bosch K-Jetronic mechanical fuel injection
  • 1982-1988 E30 318i— 77 kW (103 bhp), 10.0:1 compression, Bosch L-Jetronic electronic fuel injection
  • 1981-1988 E28 518i— 77 kW (103 bhp), 9.5:1 compression, Bosch LE-Jetronic mechanical fuel injection.

1,990 cc enginesEdit

The M05 version has a displacement of 1,990 cc (121.4 cu in) and produces 75–89 kW (101–119 bhp), depending on specification. It has a bore of 89 mm (3.5 in) and a stroke of 80 mm (3.1 in).

Applications:

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

The M15 version used the Kugelfischer mechanical fuel injection and produced 97 kW (130 bhp). It was also known as the tii engine.

Applications:

The M17 version produces 85 kW (114 bhp). It has compression ratio of 9.0:1 and uses either a Stromberg 175 CDET or a Solex 4A1 carburettor.[citation needed]

Applications:

  • 1972-1977 E12 520

The M43/1 version has a compression ratio of 8.1:1 and produces 80 kW (107 bhp).

Applications:

  • 1975-1979 E21 320— Solex 32-32 DIDTA carburettor
  • 1975-1979 E21 320i— USA only, Bosch K-Jetronic mechanical fuel injection

The M64 version produces 93 kW (125 bhp). It has a compression ratio of 9.3:1 and uses Bosch K-Jetronic mechanical fuel injection.

Applications:

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

The M31 version uses a KKK turbocharger and produces 125 kW (168 bhp). It has a compression ratio of 6.9:1 and uses Kugelfischer P04 mechanical fuel injection with a sliding throttle plate.

Applications:

Related enginesEdit

The highly successful M12 turbocharged motorsport engine was based on the M10 engine block.

The S14 engine used in the E30 M3 was based on the M10 block.[10]

See alsoEdit

ReferencesEdit

  1. ^ a b "BMW World - M10 Engine". www.usautoparts.net. Archived from the original on 21 April 2012.
  2. ^ "BMW M10 Four Cylinder Engines". www.unixnerd.demon.co.uk. Retrieved 25 January 2017.
  3. ^ "M10 - E30 Zone Wiki". www.e30zone.net. Retrieved 28 January 2017.
  4. ^ [1]
  5. ^ "1975 BMW Type 114 1502 Specs". www.ultimatespecs.com. Retrieved 23 January 2017.
  6. ^ "1961 BMW New Class 1500 Specs". www.ultimatespecs.com. Retrieved 23 January 2017.
  7. ^ "1981 BMW E21 3 Series 315 Specs". www.ultimatespecs.com. Retrieved 23 January 2017.
  8. ^ "1962 BMW 1800 specifications, information, data, photos". www.carfolio.com. Retrieved 24 January 2017.
  9. ^ "BMW M99 Automobilmotor". BMW Group Archiv (in German). Retrieved 30 November 2018.
  10. ^ "3 Series – E30". BMW History. Archived from the original on 2012-03-07. Retrieved 2012-11-07.