The BMW M10 is an SOHC four-cylinder petrol engine which was produced from 1962-1988. It was BMW's first four-cylinder engine since the BMW 309 ended production in 1936 and was introduced in the New Class sedans. Over 3.5 million M10 engines were produced during the M10's 26 year production run, and it was used in many BMW models. The turbocharged

BMW M12 The BMW M12/13 turbo was a 1499.8 cc 4-cylinder turbocharged Formula One engine, based on the standard BMW M10 engine introduced in 1961, powered the F1 cars of Brabham, Arrows and Benetton. Nelson Piquet won the FIA Formula One Drivers' ...

engine— used in the Formula One racing— was based on the M10 engine block and produced up to in qualifying trim. Following the introduction of the BMW M40 engine in 1987, the M10 began to be phased out.

Development

Baron Alex von Falkenhausen— an engineer and racing driver— designed the M10 . In the late 1950s, he was asked to design an engine with a displacement of , however he felt that this would be insufficient for the company's future needs. Therefore, he convinced BMW that the capacity should be instead and he designed a block that could be expanded to in the future.

Design

The M10 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. The initial version of the M10 had a bore of and a

stroke A stroke is a medical condition in which poor blood flow to the brain causes cell death. There are two main types of stroke: ischemic, due to lack of blood flow, and hemorrhagic, due to bleeding. Both cause parts of the brain to stop functionin ...

of , resulting in a displacement of . It had

hemispherical combustion chamber A hemispherical combustion chamber is a type of combustion chamber in a reciprocating internal combustion engine with a domed cylinder head notionally in the approximate shape of a hemisphere (in reality usually a spheric section thereof). An en ...

s, an aluminum alloy head and two valves per cylinder. The peak power rating was .

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, 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.

Versions

1499 cc engines

The M115 version has a displacement of and produces . It has a bore of and a stroke of . Lower power models have a

compression ratio The compression ratio is the ratio between the volume of the cylinder and combustion chamber in an internal combustion engine at their maximum and minimum values. A fundamental specification for such engines, it is measured two ways: the stati ...

of 8.0:1, while higher power models have a compressions ratio of 8.8:1. Fuel is supplied via a

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38 PDSI carburettor. Applications: * 1962-1964

BMW 1500 Year 1500 ( MD) was a leap year starting on Wednesday of the Julian calendar. The year 1500 was not a leap year in the Proleptic Gregorian calendar. The year was seen as being especially important by many Christians in Europe, who thought it ...

* 1975-1977 BMW 1502

1573 cc engines

The M116 version has a displacement of and produces . It has a bore of and a stroke of . 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: * 1964-1966 BMW 1600— * 1966-1975 BMW 1600-2/1602— * 1967-1968 BMW 1600 ti— The M41 version produces , has an 8.3:1 compression ratio and fuel is supplied by a Solex 32 DIDTA carburettor. Applications: * 1975-1980 E21 316 The M98 version produces , has a compression ratio of 9.5:1 and uses a Pierburg 1B2 carburettor. Applications: * 1981-1983 E21 315

1766 cc engines

The M10B18 version produces , depending on specification. The bore is and the stroke is . Applications: * 1969-1972 1800— , 8.6:1 compression, Solex 36-40 PDSI carburettor * 1971-1975 1802— , 8.6:1 compression, Solex 38 PDSI carburettor * 1980-1983 E21 320i/320is— U.S. only, , 8.8:1 compression, Bosch K-Jetronic

mechanical fuel injection Fuel injection is the introduction of fuel in an internal combustion engine, most commonly automotive engines, by the means of an injector. This article focuses on fuel injection in reciprocating piston and Wankel rotary engines. All comp ...

* 1980-1983 E12 518— South Africa only, , 10.0:1 compression, Bosch K-Jetronic mechanical fuel injection *1982-1987 E30 316 — , 9.5:1 compression, Pierburg 2BE carburettor, Ecotronic. * 1982-1988 E30 318i— , 10.0:1 compression, Bosch L-Jetronic electronic fuel injection * 1981-1988 E28 518i— , 9.5:1 compression, Bosch LE-Jetronic mechanical fuel injection.

1773 cc engines

The M118 version has a displacement of and produces , depending on specification. The bore is and the stroke is . Applications: * 1963-1968 1800— , 8.6:1 compression, Solex 36-40 PDSI carburettor * 1963-1966 1800ti— , 9.5:1 compression, twin Solex 40 PHH carburettors * 1964-1965 1800tiSA— , 10.5:1 compression, twin Weber DCOE-45 carburettors * 1974-1981 E12 518— , 8.6:1 compression, Solex 38 PDSI carburettor

1990 cc engines

The M05 version has a displacement of and produces , depending on specification. It has a bore of and a stroke of . Applications: * 1965-1970 BMW 2000CS— , 9.3:1 compression, 2x Solex 40 PHH carburettors * 1966-1970 BMW 2000C— , 8.5:1 compression, Solex 40 PDSI carburettor * 1966-1972

BMW 2000 2000 was designated as the International Year for the Culture of Peace and the World Mathematical Year. Popular culture holds the year 2000 as the first year of the 21st century and the 3rd millennium, because of a tendency to group the y ...

— , 8.5:1 compression, Solex 40 PDSI carburettor * 1966-1971 BMW 2000ti— , 9.3:1 compression, 2x Solex 40 PHH carburettors * 1968-1976

BMW 2002 File:2002 Events Collage.png, From left, clockwise: The 2002 Winter Olympics are held in Salt Lake City; Queen Elizabeth The Queen Mother and her daughter Princess Margaret, Countess of Snowdon die; East Timor gains independence from Indonesia and ...

— , 8.5:1 compression, Solex 40 PDSI carburettor The M15 version used the

Kugelfischer Kugelfischer injection (also called ''System Kugelfischer'') is the name for a mechanical fuel injection (MFI) pump. It was produced by FAG Kugelfischer and later by Robert Bosch GmbH Derived from diesel pumps from the early 1960s, the Kugelfisch ...

mechanical fuel injection and produced . It was also known as the ''tii'' engine. Applications: * 1970-1973 2000tii * 1972-1974 2002tii * 1972-1974 E12 520i The M17 version produces . It has compression ratio of 9.0:1 and uses either a Stromberg 175 CDET or a Solex 4A1 carburettor. Applications: * 1972-1977 E12 520 The M43/1 version has a compression ratio of 8.1:1 and produces . 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 . 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 BLD turbocharger operating @ 7psi and produces . It has a compression ratio of 6.9:1 and uses Schafer PL 04 mechanical fuel injection. Applications: * 1973-1975 2002 turbo

Related engines

The highly successful M12 turbocharged motorsport engine was based on the M10 engine block. The S14 engine used in the

E30 M3 The BMW M3 is a high-performance version of the BMW 3 Series, developed by BMW's in-house motorsport division, BMW M GmbH. M3 models have been produced for every generation of 3 Series since the E30 M3 was introduced in 1986. The initial model ...

was based on the M10 block.

References

{{DEFAULTSORT:Bmw M10 M10 Straight-four engines Gasoline engines by model