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BMW M73 Engine For Sale

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    This engine replaced the previous M70 unit, also split into 12 V- cylinders.

    However, there were notable differences with the previous unit, since first of all the construction technology changed, which uses electrochemically treated alusil for the monobloc, in order to obtain silicon barrels. The two heads are in aluminum alloy.

    The bore and stroke measurements also change, 85×79 mm. The overall displacement is thus increased to 5379 cm³. The electronic control unit is also different, again a Bosch, but this time a Motronic M5.2 instead of the previous LH-Jetronic. In some versions, however, there were two control units, one per bank.

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    On the other hand, the 60 ° angle between the two banks is maintained in the previous unit. Unchanged also the two heads 2 valves per cylinder and the distribution to a camshaft in head per cylinder bank with schema SOHC.

    Performance values ​​have also undergone significant increases: maximum power has in fact increased from 299 to 326 HP at 5000 rpm, while torque has reached 490 Nm at 3900 rpm (450 Nm at 4100 rpm in the M70 engine ).

    This engine was mounted on:

    BMW 750i / 750iL E38 ( 1994 – 01 );
    BMW L7 E38 ( 1996 -01);
    BMW 850Ci E31 (1994- 99 ).
    The M73 engine won the 1999 Engine of the Year title in the over 4 liter category.


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