BMW M10

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BMW M10/M12
Manufacturer	BMW
Production	1961–1987
Successor	BMW M40
Class	SOHC Straight-4
Engine	1.5 L (1499 cc/91 in³) 1.6 L (1573 cc/95 in³) 1.8 L (1766 cc/107 in³) 1.8 L (1773 cc/108 in³) 2.0 L (1990 cc/121 in³)
Related	BMW S14
Similar	Mercedes-Benz M115

The BMW M10/M12 was an I4 piston engine produced from 1961 to 1987. Displacement ranged from 1499 cm³ to 1990 cm³.

The engine was designed by Baron Alex von Falkenhausen, noted engineer and race driver. 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 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.

The M10 engine is also one of the most successful engines in racing. Starting with the European Touring Car Championship, it was also used in Formula 2, then the Deutsche Rennsport Meisterschaft, were it was turbocharged by Paul Rosche according to FIA Group 5 rules.

The M10 block went on to Formula 1, winning the 1983 championship for Nelson Piquet and Brabham - something which very few 20 year old road car engine designs accomplish. The same applies for the rise in power, twenty-fold from 75 hp to about 1500 hp.

The BMW S14 engine for the first BMW M3 was based upon the M10 block. In the M3, the M10 is still winning races today.

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

[edit] Formula One history

Brabham had tested a BMW turbocharged engine in the summer of 1981, and 1982's new BT50 was designed around it. Brabham thus became only the third team after Renault and Ferrari to employ a turbo engine.

Initially the turbo engine electronics had issues that made it hard to drive and unreliable. The relationship came close to ending, with BMW insisting that Brabham stop using the Cosworth powered BT49Ds, while Ecclestone maintained that the BMW powered cars were not reliable enough. Together with Bosch, the BMW engineers solved the problem. The partnership took its first win at the 1982 Canadian Grand Prix. In 1983 Nelson Piquet became the first driver to win the world championship in a turbo-engined car.

Murray's radical long and low BT55, was fitted with a revised BMW engine tilted over to allow clean airflow to the rear wing. The design was not a success, scoring only two points in the 1986 Formula One season; the engine did not perform well in this orientation and the gearbox from Weissman was unreliable.

From 1986 BMW were winding down their Formula One involvement. In 1987 Brabham continued to use the 'tilted' units, as the upright versions had been sold to other teams under the Megatron title - they were used by Arrows and Ligier with moderate success. BMW, whose programme was based around turbocharged versions of their road engines, withdrew from Formula One after the 1987 season. The Megatron badged units were used until the end of 1988.

**Models**
Engine	Displacement	Power	Torque	Year
M10B18	1.7 L (1766 cc/107 in³)	77 kW (103 hp) @ 5800	145 N·m (106 ft·lbf) @ 4500	1980
M10B18	1.7 L (1766 cc/107 in³)	75 kW (100 hp) @ 5800	140 N·m (103 ft·lbf) @ 4500	1985
M10B18	1.7 L (1766 cc/107 in³)	77 kW (103 hp) @ 5800	145 N·m (106 ft·lbf) @ 4500	1980
M10B18	1.7 L (1766 cc/107 in³)	75 kW (100 hp) @ 5800	140 N·m (103 ft·lbf) @ 4500	1985
M10B18V	1.7 L (1766 cc/107 in³)	66 kW (88 hp) @ 5500	140 N·m (103 ft·lbf) @ 4000	1981
M10B18V	1.7 L (1766 cc/107 in³)	66 kW (88 hp) @ 5500	140 N·m (103 ft·lbf) @ 4000	1981

[edit] M115

The 1.5 L (1499 cc/91 in³) M115 produced 75 hp or 80 hp (56 kW or 60 kW) (depending on carburetor) and 118 ft·lbf (160 N·m).

Applications:

1962-1964 BMW 1500
1975-1977 BMW 1500

[edit] M118

The 1.8 L (1773 cc/108 in³) M118 produced 90 hp to 130 hp (67 kW to 97 kW) and 143 to 150 ft·lbf (194 to 203 N·m).

Applications:

1963-1974 BMW 1800
1974 E12 518

[edit] M116

The 1.6 L (1573 cc/95 in³) M116 produced 75 hp to 105 hp (56 kW to 78 kW). Bore was 84 mm and stroke was 71 mm.

Applications:

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

[edit] M05

The 2.0 L (1990 cc/121 in³) M05 produced 100 hp to 120 hp (75 to 90 kW) and 157 ft·lbf to 167 ft·lbf (213 to 226 N·m). Bore was 89 mm and stroke was 80 mm.

Applications: