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M20B25 to replace '87 M20B27

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    M20B25 to replace '87 M20B27

    I know somewhere there is a writeup on in "e" to "i" swap, but I lost the link. Anyone have it? I am trying to get an idea of what needs to be replaced to make this work.
    Current Cars
    2014 M235i
    2009 R56 Cooper S
    1998 M3
    1997 M3

    #2
    someone - anyone????? in particular, it is an '89 M20B25 from an auto cat to go into an '87 es 5 speed.

    I know the engine, motronic and perhaps wioring harness need to be switched. What about the flywheel?
    Current Cars
    2014 M235i
    2009 R56 Cooper S
    1998 M3
    1997 M3

    Comment


      #3
      You'll need the new wiring harness.

      The flywheel - you can use the one off the B27 - but it'll be dual-mass. SInce you're in there, you might as well convert to single mass and put in a new clutch and everything.

      I'm not sure if the reference sensors are in different spots, but your tranny should mate right up - if there's a hole in the tranny for a sensor, just plug it up. The sensor on the new 89 is on the front of the engine on the crankshaft balancer.
      - Sean Hayes

      Comment


        #4
        Originally posted by Sean
        You'll need the new wiring harness.

        The flywheel - you can use the one off the B27 - but it'll be dual-mass. SInce you're in there, you might as well convert to single mass and put in a new clutch and everything.

        I'm not sure if the reference sensors are in different spots, but your tranny should mate right up - if there's a hole in the tranny for a sensor, just plug it up. The sensor on the new 89 is on the front of the engine on the crankshaft balancer.
        So the flywheel off of the i auto won't work? I was going to do the clutch. As for the sensor - thanks for that info. My 87 i has it on the front as well. I would not have though of that.
        Current Cars
        2014 M235i
        2009 R56 Cooper S
        1998 M3
        1997 M3

        Comment


          #5
          josh anderson did it

          use a i flywheel. the dually would suck a fat one at the track.

          Comment


            #6
            Originally posted by rwh11385
            josh anderson did it

            use a i flywheel. the dually would suck a fat one at the track.
            but is the i flywheel the same on the auto as the stick?????
            Current Cars
            2014 M235i
            2009 R56 Cooper S
            1998 M3
            1997 M3

            Comment


              #7
              :?

              :?: i dunno g

              Comment


                #8
                No, the auto doesn't have a flywheel, it's an auto... :ohsnap: (it has somethin else, but i'm having a brain fart, so I can't remember what's it called specifically)

                lol

                Get a single mass I flywheel off ebay, take it to a shop, have it lightened, and get a new OEM Sach's clutch kit. Wear the clutch in for like 500 miles. I did it for mine, and it grabs SOO well. hehe

                If you're reference sensor is up front, then no worries for your 5spd tranny - it'll work perfect.

                Robert's not kiddin about the dual-mass gayfer flywheel. It's LAME. 27 lbs of GAYNESS lol What you want is 12 lbs of GOODNESS!

                Lightweight flywheels are HEAVAN! :)
                - Sean Hayes

                Comment


                  #9
                  Originally posted by Sean
                  No, the auto doesn't have a flywheel, it's an auto... :ohsnap: (it has somethin else, but i'm having a brain fart, so I can't remember)

                  lol

                  :)
                  the etk calls what the auto has a flywheel - but . . .


                  I can get an I flywheel pretty cheap locally. Thanks for the advice.
                  Current Cars
                  2014 M235i
                  2009 R56 Cooper S
                  1998 M3
                  1997 M3

                  Comment


                    #10
                    Well, it doesn't have a flywheel. If it did, why would people doing a tranny swap need to buy one? ;)
                    - Sean Hayes

                    Comment


                      #11
                      its still called a flywheel. a flywhell is what the starter turns. the autos have a flywheel with a flexplate on it for the torque converter. the manuals have a flywheel with a wear surface for the clutch :idea:

                      Comment


                        #12
                        and no i cnat type worth a damn

                        Comment


                          #13
                          strictlyeta.net has a write-up.


                          http://www.cardomain.com/ride/657387

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