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| − | M20B25 2.5 litre 12 Valve Engine
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| − | [[Image:M30b25_engine.jpg]]
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| − | The M20 is an straight-6 piston engine of BMW.
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| − | 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+)
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| − | 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.
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| − | 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.
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| − | As the BMW M21, it became a diesel engine that was also available with a turbocharger.
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| − | Engine Specs
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| − | {| class=wikitable
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| − | |+'''Models'''
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| − | !Engine!!Displacement!!Power!!Torque!!Redline!!Year
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| − | |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
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| − | |92 kW (123 hp) @ 5800||170 N·m (125 ft·lbf) @ 4000|| ||1981
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| − | |95 kW (127 hp) @ 6000||174 N·m (128 ft·lbf) @ 4000||6200||1985
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| − | |95 kW (129 hp) @ 6000||164 N·m (120 ft·lbf) @ 4300||6200||1986
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| − | |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
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| − | |110 kW (139-150 hp) @ 6000||205 N·m (151 ft·lbf) @ 4000||6500||1983
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| − | |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
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| − | |120 kW (170 hp) @ 5800||215 N·m (158 ft·lbf) @ 4000||6700||1985
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| − | |125 kW (168 hp) @ 5800||222 N·m (163 ft·lbf) @ 4300||6700||1987
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| − | |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
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| − | |95 kW (127 hp) @ 4250||240 N·m (177 ft·lbf) @ 3250||4500||1986
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| − | |90 kW (120 hp) @ 4250||230 N·m (169 ft·lbf) @ 3250||4500||1985
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| − | |95 kW (127 hp) @ 4800||230 N·m (169 ft·lbf) @ 3200||4500||1986
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| − | |}
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| − | '''Other variations'''
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| − | *M20b20
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| − | *M20b23
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| − | [[Category: E30 Engines]]
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