E30 Zone Wiki - User contributions [en]

M20

2008-07-16T05:20:47Z

Blitz:

{{stub}}

M20B25 2.5 litre 12 Valve Engine

[[Image:M30b25_engine.jpg]]

The M20 is an straight-6 piston engine of BMW.

The 12-valve, belt driven SOHC design was introduced in the 1977 BMW 520/6 and 320/6. With displacements ranging from 2.0 to 2.7 liters, it was the "little brother" to the larger BMW M30 engine. It was intended to replace the larger displacement 4-cylinder motors and was born out of BMW's conviction that a small six had more development potential than a large four (i.e. 2 liters+)

Powering the E21 and E30 3-Series, as well as E12, E28 and E34 5 Series cars, it was produced for nearly two decades, with the last examples powering the E30 325i touring built until sometime in 1993. By that time, the newer twin-cam M50 engines with 4 valves per cylinder had already been used in the E36 and E34 for a couple of years.

Three different head castings were used over the engine's production run. The earliest was #1264200 aka the "200". These were used in all e21 320/6 and 323i and e12 520/6 engines and later in the e28 and e30 eta engines (eta = "Power With Economy"). The next version was #1277731 aka the "731". This head was the same as the 200 but featured larger intake ports. The final version was #1705885 or "885" introduced in the 325i. Ports were further enlarged, valves were larger and the combustion chamber was redesigned to improve flow and thermodynamic efficiency.

As the BMW M21, it became a diesel engine that was also available with a turbocharger.

Engine Specs

{| class=wikitable
|+'''Models'''
|-
!Engine!!Displacement!!Power!!Torque!!Redline!!Year
|-
|rowspan=4| [[#M20B20|M20B20]]||rowspan=4|2.0 L (1990 cc/121 in³)||92 kW (123 hp) @ 5800||165 N·m (121 ft·lbf) @ 4000|| ||1981
|-
|92 kW (123 hp) @ 5800||170 N·m (125 ft·lbf) @ 4000|| ||1981
|-
|95 kW (127 hp) @ 6000||174 N·m (128 ft·lbf) @ 4000||6200||1985
|-
|95 kW (129 hp) @ 6000||164 N·m (120 ft·lbf) @ 4300||6200||1986
|-
|rowspan=2|[[#M20B23|M20B23]]||rowspan=2|2.3 L (2316 cc/141 in³)||102 kW (143 hp) @ 5300||205 N·m (151 ft·lbf) @ 4000||6500||1982
|-
|110 kW (139-150 hp) @ 6000||205 N·m (151 ft·lbf) @ 4000||6500||1983
|-
|rowspan=3|[[#M20B25|M20B25]]||rowspan=3|2.5 L (2494 cc/152 in³)||126 kW (168 hp) @ 5800||226 N·m (166 ft·lbf) @ 4000||6700||1985
|-
|120 kW (170 hp) @ 5800||215 N·m (158 ft·lbf) @ 4000||6700||1985
|-
|125 kW (168 hp) @ 5800||222 N·m (163 ft·lbf) @ 4300||6700||1987
|-
|rowspan=4|[[#M20B27|M20B27]]||rowspan=4|2.7 L (2693 cc/164 in³)||92 kW (121 hp) @ 4250||240 N·m (177 ft·lbf) @ 3250||4500||1983
|-
|95 kW (127 hp) @ 4250||240 N·m (177 ft·lbf) @ 3250||4500||1986
|-
|90 kW (120 hp) @ 4250||230 N·m (169 ft·lbf) @ 3250||4500||1985
|-
|95 kW (127 hp) @ 4800||230 N·m (169 ft·lbf) @ 3200||4500||1986
|}

'''Other variations'''
*M20b20
*M20b23

[[Category: E30 Engines]]

M20

2008-07-16T05:17:33Z

Blitz:

{{stub}}

M20B25 2.5 litre 12 Valve Engine

[[Image:M30b25_engine.jpg]]

The M20 is an straight-6 piston engine of BMW.

The 12-valve, belt driven SOHC design was introduced in the 1977 BMW 520/6 and 320/6. With displacements ranging from 2.0 to 2.7 liters, it was the "little brother" to the larger BMW M30 engine. It was intended to replace the larger displacement 4-cylinder motors and was born out of BMW's conviction that a small six had more development potential than a large four (i.e. 2 liters+)

Powering the E21 and E30 3-Series, as well as E12, E28 and E34 5 Series cars, it was produced for nearly two decades, with the last examples powering the E30 325i touring built until sometime in 1993. By that time, the newer twin-cam M50 engines with 4 valves per cylinder had already been used in the E36 and E34 for a couple of years.

Three different head castings were used over the engine's production run. The earliest was #1264200 aka the "200". These were used in all e21 320/6 and 323i and e12 520/6 engines and later in the e28 and e30 eta engines (eta = "Power With Economy"). The next version was #1277731 aka the "731". This head was the same as the 200 but featured larger intake ports. The final version was #1705885 or "885" introduced in the 325i. Ports were further enlarged, valves were larger and the combustion chamber was redesigned to improve flow and thermodynamic efficiency.

As the BMW M21, it became a diesel engine that was also available with a turbocharger.

Engine Specs

Engine Displacement Power Torque Redline Year
M20B20 2.0 L (1990 cc/121 in³) 92 kW (123 hp) @ 5800 165 N·m (121 ft·lbf) @ 4000 1981
92 kW (123 hp) @ 5800 170 N·m (125 ft·lbf) @ 4000 1981
95 kW (127 hp) @ 6000 174 N·m (128 ft·lbf) @ 4000 6200 1985
95 kW (129 hp) @ 6000 164 N·m (120 ft·lbf) @ 4300 6200 1986
M20B23 2.3 L (2316 cc/141 in³) 102 kW (143 hp) @ 5300 205 N·m (151 ft·lbf) @ 4000 6500 1982
110 kW (139-150 hp) @ 6000 205 N·m (151 ft·lbf) @ 4000 6500 1983
M20B25 2.5 L (2494 cc/152 in³) 126 kW (168 hp) @ 5800 226 N·m (166 ft·lbf) @ 4000 6700 1985
120 kW (170 hp) @ 5800 215 N·m (158 ft·lbf) @ 4000 6700 1985
125 kW (168 hp) @ 5800 222 N·m (163 ft·lbf) @ 4300 6700 1987
M20B27 2.7 L (2693 cc/164 in³) 92 kW (121 hp) @ 4250 240 N·m (177 ft·lbf) @ 3250 4500 1983
95 kW (127 hp) @ 4250 240 N·m (177 ft·lbf) @ 3250 4500 1986
90 kW (120 hp) @ 4250 230 N·m (169 ft·lbf) @ 3250 4500 1985
95 kW (127 hp) @ 4800 230 N·m (169 ft·lbf) @ 3200 4500 1986

'''Other variations'''
*M20b20
*M20b23

[[Category: E30 Engines]]

M20

2008-07-16T05:16:27Z

Blitz:

M20

2008-07-16T05:14:30Z

Blitz:

{{stub}}

M20B25 2.5 litre 12 Valve Engine

[[Image:M30b25_engine.jpg]]

The Euro version of the M20B25 produced 170 hp with a catalytic converter and 171 without. It featured "885" head with larger ports and valves, 84 mm (3.3 in) bore, and 75 mm (3 in) stroke. Most significantly it had redesigned pistons and combustion chambers for better power, more resistance to detonation and higher thermodynamic efficiency. It was equipped with Bosch Motronic 1.1/1.3 Adaptive fuel injection. With a minor modification that adjusts the idle speed of a cold engine, the 325i fulfills Euro 2 emission requirements in Germany, resulting in a lower tax compared to Euro 1 (as of 2005).

Applications:

* 1986–1994 E30 3 Series
* 1989–1990 E34 5 Series
* 1988–1991 E30 Z1

'''Other variations'''
*M20b20
*M20b23

[[Category: E30 Engines]]