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    Flywheel question...

    325i flywheel and 325e flywheel, are they the same?

    Help is appreciated.
    - Trey

    E90 325i/6 (ZSP, ZPP, ZCW)
    E36 325i sedan
    E30 325i sedan
    Volvo 945T

    #2
    Depends. Some were dual mass and some were singal mass.

    Comment


      #3
      Simple answer. No.

      Comment


        #4
        Semi in-depth answer--

        Early eta's had a heavy single mass flywheel that was essentially the same as the later B25 flywheel, although it weighed about 4-5 lbs. more. The early eta flywheel is 23 lbs iirc. The B25 flywheel weighs about 19 lbs.

        The late eta had a dual mass flywheel, that weighs a ton and just sucks. It weighs around 27 lbs.

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          #5
          Ah, okay. Thanks for the information.
          - Trey

          E90 325i/6 (ZSP, ZPP, ZCW)
          E36 325i sedan
          E30 325i sedan
          Volvo 945T

          Comment


            #6
            Ryan, so a supereta would have the heavy dual mass? Meaning even a stock 'i' fly would be an upgrade...

            good info!
            BEERTECH

            Comment


              #7
              The I flywheel wont have a TDC ref mark for the old 25 pin DME sensor.

              Comment


                #8
                The early 528e flywheels were 13 pounds AND had a TDC pin!
                You can duplicate that by shaving the engine side of the flywheel down to the level of the ring gear but then leave about .010 of a lip, no TDC pin however unless you put one on.

                Comment


                  #9
                  Originally posted by Flash View Post
                  The early 528e flywheels were 13 pounds AND had a TDC pin!
                  I've got one of these in the command center.

                  Yeah Rob, all 9/85 and later etas have the giant flywheel. Even the earlier eta single mass flywheel is an upgrade (that's what I had in my eS). Mine was used with a B25i clutch and pressure plate. Worked good.

                  I weighed all of the flywheels one night at Mitch M's shop on a postal scale. The early 528e/320i/323i flywheel weighs 13lbs., the early eta flywheel weighs 23lbs., the late eta weighs 27lbs., and the B25i flywheel weighs 17 or 19lbs (pretty sure it was 19lbs).

                  Comment


                    #10
                    Will a late eta clutch bolt up to a early 528e flywheel?
                    Byron
                    Leichtbau

                    Comment


                      #11
                      All the bolt patterns are the same for the m20 flywheels, the question is will the stack height be the same.
                      The pressure plate is a lot thicker for the 325i to make up for the shorter flywheel, realoem would tell you if the part numbers are the same anyhow. Dual mass does not use a sprung hub since the flywheel is spring, and single mass....vice versa.

                      Comment


                        #12
                        interesting, how about those 323 ones?
                        Supatek -noun - your basic know it all

                        Comment


                          #13
                          Uh, can someone help me out on this? I am getting ready to install a 325i engine in my 86 325e and dont fully understand the flywheel issue.

                          Assistance is needed.
                          Randall Racing and Engineering
                          Acworth, Georgia, 30101
                          http://www.facebook.com/RandallRacingandEngineering

                          Comment


                            #14
                            Here is my VIN if this helps WBAAB5407G9634771.
                            Randall Racing and Engineering
                            Acworth, Georgia, 30101
                            http://www.facebook.com/RandallRacingandEngineering

                            Comment


                              #15
                              You need a single mass flywheel from a 325i/is, matching clutch, pilot bearing and throw out bearing.
                              The car makes it possible, but the driver makes it happen.
                              Jim Levie, Huntsville, AL

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