1986 M20b25 into 1990 325ix

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  • rtkelly32
    Noobie
    • Nov 2025
    • 1

    #1

    1986 M20b25 into 1990 325ix

    Hi guys, I have a 1990 325ix with a blown motor. currently looking at a good deal on a 1986 m20b25 out of a 325ix. I’m seeing most of everything is adaptable onto the head and block, but wondering if there are any issues I’ll run into with the drivetrain and ecu.
  • TobyB
    R3V Elite
    • Oct 2011
    • 5178

    #2
    As long as it's not an eta and you change things such as sensors, oil pan and the thermostat housing, it ought to work just fine...
    www.realoem.com has part numbers broken out, if you want to go through it carefully.

    t
    now, sometimes I just mess with people. It's more entertaining that way. george graves

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    • litu
      E30 Modder
      • Jan 2012
      • 818

      #3
      That info what you are giving, it is bolt on job...When you have old engine out and you have "new" engine by side you can see what need to take your current engine to that "new" engine...
      It looks like that your current engine is Motronic 1.3 ECU system and "new" engine is -86 so it should be Motronic 1 ECU system, so i would take from your current engine, water pump/belt pulley, harmonic balancer, crank shaft position sensor/holder, oil level sensor, engine wire harness.
      https://www.facebook.com/Cry_77_IX-110483784967661
      https://www.instagram.com/cry_77_ix/

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