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BMW M50 Engine For Sale

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    This engine family was born to replace the now dated M20 family, which by now was inadequate to the new models, due to poor performance in relation to the increased mass of the models themselves. The M20 family was however the starting point for creating this new family, whose salient features were:

    6- cylinder in-line architecture ;
    electronic injection power supply ;
    DOHC type distribution with 4 valves per cylinder;
    displacements between 2 and 2.5 liters.

    M50 engine on a 1993 BMW 525i Touring E34
    The M50 family was divided into five versions, up to 1995, and was then replaced by the M52 family. The S50 engines are also derived from this family, with displacements between 3 and 3.2 liters.

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    M50B20

    Directly derived from the 2-liter M20B20LE, it retains its natural bore and stroke measurements (80×66 mm ), and therefore the overall displacement of 1991 cm³.

    However, those described above are added to these features, plus a new electronic control unit for injection, a Bosch DME 3.1.

    The maximum power deliverable by this engine was 150 hp at 5900 rpm, while the maximum torque was 190 Nm at 4700 rpm. This engine, completed in 1989, however, has been used since 1990.

    It was mounted on:

    BMW 320i E36 ( 1991 -95);
    BMW 520i E34 ( 1990 -92).

    M50TUB20

    An M50 engine exhibited at the BMW Museum in Munich
    This abbreviation indicates an evolution of the 2 liters described above. Compared to the latter, the substantial difference was in the adoption of the VANOS variable valve timing system. The maximum power delivery is identical, as is the peak torque, but available at 4200 rpm.

    This engine was used between 1992 and 1995 on BMW 320i E36 and 520i E34.

    M50B24

    This engine is a particular version of the M50B25 unit described below. Compared to the latter, it has a slightly reduced stroke and is relatively weakened compared to the 2-liter, since it delivers the same power of 150 hp at 5900 rpm, but with a better starting point thanks to the better torque delivery.

    This engine was used between 1993 and 1997 only and exclusively on some Series 3 and Series 5 models reserved for the Thai market.

    M50B25

    The M50 engine under the hood of a 1993 BMW 325is E36
    It is the best performing version among those belonging to the M50 family. Like the 2-liter unit, it too derives from the corresponding 2.5-liter unit of the M20 family, of which it maintains the bore and stroke (84×75 mm) and displacement (2494 cm³) measurements. Thanks to the twin camshaft distribution and the 4 valves per cylinder, maximum power increased from 170 to 192 hp at 5900 rpm, with a peak torque of 246 N · m at 4700 rpm.

    This engine was introduced at the same time as the 2-liter M50 and went to equip:

    BMW 325i E36 (1990-92);
    BMW 525i E34 (1990-92).

    M50B25TU

    This engine was introduced in September 1992 and is almost identical to the M50B25, from which it differs in the VANOS variable valve timing system. The maximum power and torque values ​​remain unchanged, but the latter is available at 4200 rpm instead of 4700.

    The same were also the models on which this engine was used until 1995.

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