M20 Single Mass Flywheel

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  • Mike B.
    E30 Modder
    • Jan 2006
    • 987

    #1

    M20 Single Mass Flywheel

    Can the M20 single mass flywheel be machined (and lightened) to work with the M50 and E36 transmission? I guess I'm just being cheap as I don't want to drop big bucks on a new lightweight flywheel.
  • Jason89i
    E30 Modder
    • Sep 2004
    • 875

    #2
    Originally posted by Mike B.
    Can the M20 single mass flywheel be machined (and lightened) to work with the M50 and E36 transmission? I guess I'm just being cheap as I don't want to drop big bucks on a new lightweight flywheel.
    mike -
    i did the m50, lightened flywheel and e30 trans.....but i ran into some difficulties. never did the "i" flywheel with the e36 trans though. if you get a chance, measure the thickness of your proposed clutch assembly......(the distance from the crank mating surface to pressure plate teeth.) I have a few m3 flywheels/clutchs sitting around and can verify that the overall thicknesses of the assemblies are the same. cheers, jason

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    • raimo
      Noobie
      • Nov 2005
      • 36

      #3
      will the 325i flywheel work with getrag 260 and m50 or not ?
      some guys say it works, some say it doesnt. im in the opinion that i have to use the dual mass flywheel instead.

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      • 325Projectz
        E30 Mastermind
        • Jan 2005
        • 1956

        #4
        It will work. If you go with a m20 flywheel, then you just need to use m20 starter, clutch, trans, and driveshaft.

        And you need to shave either the flywheel or the oil pan.
        91 m3

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        • erik325i
          No R3VLimiter
          • Jan 2005
          • 3567

          #5
          Yes, the m20 flywheel will work.

          We just finished an m50 swap at work and we used:
          m50tu with e36 tranny, and machined down m20 flywheel. Works great.

          -Erik

          Comment

          • Mike B.
            E30 Modder
            • Jan 2006
            • 987

            #6
            Erik,

            A few more questions...

            Did you use the M20 starter? How much material did you remove from the flywheel? What type of clutch are you running?

            Comment

            • DanThe
              Member
              • Mar 2006
              • 98

              #7
              I used M20 flywheel/clutch and starter with my M50 engine/E36 325 trans. An M20 325 propshaft fits perfect.
              6mm is all that needs to be removed from the back of the flywheel as it will contact the bolts on the back of the block, see here \/ before and after.


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