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Dual mass flywheel in an M50..it's not what you think.

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    #1

    Dual mass flywheel in an M50..it's not what you think.

    So I was actually searched for an answer and found mixed ideas but mostly that the dual mass flywheel (from an E) just wont work. So I have a couple of questions.
    Per http://www.r3vlimited.com/board/show...light=flywheel
    this thread Jason says the Dual mass flywheel is about +/- 3/16ths of an inch too thick let alone needing the back side machined 6mm.

    Is there some reason the dual mass flywheel can't be machined 6mm on the back and 3/16ths on the front? The bolt threads are plenty long for the bolts to still go fully tight. That would make the E dual mass flywheel the same size wouldn't it?
    Thanks in advance!
    Your signature picture has been removed since it contained the Photobucket "upgrade your account" image.

    "I cannot undertake to lay my finger on that article of the Constitution which granted a right to Congress of expending, on objects of benevolence, the money of their constituents. Charity is no part of the legislative duty of the [federal] government." ~ James Madison

    ‎"If you've got a business, you didn't build that. Somebody else made that happen" Barack Obama
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    #2
    So I measured the mounting surface of the flywheel to both the M50 block and the E block, they are exactly the same. The E flywheel should work perfectly. From an 86 E.
    Last edited by joshh; 12-08-2006, 03:24 PM.
    Your signature picture has been removed since it contained the Photobucket "upgrade your account" image.

    "I cannot undertake to lay my finger on that article of the Constitution which granted a right to Congress of expending, on objects of benevolence, the money of their constituents. Charity is no part of the legislative duty of the [federal] government." ~ James Madison

    ‎"If you've got a business, you didn't build that. Somebody else made that happen" Barack Obama

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      #3
      yeah , but why not just use the singlemass from an i? its lighter and definately works. better clutch options too.

      Comment

        #4
        Because I don't want to spend the extra cash on the I flywheel and clutch kit. Plus I already have an E flywheel that is practicly brand new and the clutch disk has tons left on it.
        Looks like it will work.
        Your signature picture has been removed since it contained the Photobucket "upgrade your account" image.

        "I cannot undertake to lay my finger on that article of the Constitution which granted a right to Congress of expending, on objects of benevolence, the money of their constituents. Charity is no part of the legislative duty of the [federal] government." ~ James Madison

        ‎"If you've got a business, you didn't build that. Somebody else made that happen" Barack Obama

        Comment

          #5
          Any decent machine shop will charge you twice the cost of a used flywheel to machine that one.

          Comment

            #6
            Originally posted by matt View Post
            Any decent machine shop will charge you twice the cost of a used flywheel to machine that one.
            Where do you get that idea? And the I flywheel still needs to be machined on the back anyways. You think a used I flywheel and machining is going to cost less than $45.00?

            The question isn't "should I use the E flywheel"...the question is why wont it work?
            Your signature picture has been removed since it contained the Photobucket "upgrade your account" image.

            "I cannot undertake to lay my finger on that article of the Constitution which granted a right to Congress of expending, on objects of benevolence, the money of their constituents. Charity is no part of the legislative duty of the [federal] government." ~ James Madison

            ‎"If you've got a business, you didn't build that. Somebody else made that happen" Barack Obama

            Comment

              #7
              suggest you look at the designs of both flywheels

              i'm not sure of the E ones as we don't get them here that much, but on my pal's m20 'i' flywheel the rears had to be machined 6mm to clear the m50 engine block

              my mech swears that he previously fitted a single mass flywheel on another m50 block without doing any skimming of any sorts but he can't recall what or which model he used, as he got it from a junkyard but then again, we do get cars and junkyard cars from HK,Japan,UK,Singapore and occasionally Australia

              Comment

                #8
                i just dremeled the oilpan a bit and my i flywheel went right on.

                Comment

                  #9
                  We know the I flywheel works with either grinding the back side of the oil pan or machining down the back side of the flywheel 6mm.

                  But per my measurements the E flywheel should work with the same exact modification. I measured from the mounting surface of the flywheel to the mounting surface of the block on both motors and they are exactly the same. And that is the same as where the tranny will bolt up on both motors.Nothing else changes so it should work. Unless someone can think of something I missed.
                  I don't see why any shimming is needed!?? I'll be fitting it today and testing it as well.
                  Keep in mined I'm using an E pressure plate as well. If that matters.
                  Your signature picture has been removed since it contained the Photobucket "upgrade your account" image.

                  "I cannot undertake to lay my finger on that article of the Constitution which granted a right to Congress of expending, on objects of benevolence, the money of their constituents. Charity is no part of the legislative duty of the [federal] government." ~ James Madison

                  ‎"If you've got a business, you didn't build that. Somebody else made that happen" Barack Obama

                  Comment

                    #10
                    The dual mas flywheel is a piece of shit, and really hinders clutch feel and performance with its "slipping" dual plate setup. Replacing the dual-mass flywheel on said equipped cars with an aluminium single mass is one of the best mods, not only due to the lighter weight of the flywheel, but mainly due to not having the "slippage" of the dual mass.

                    Comment

                      #11
                      Dual plate set up?? It works exactly the same as the I flywheel but it's thicker. That's the only difference. The I flywheel can't be more than 8-9lbs lighter than the E flywheel. Theres only a 3/16" difference in thickness.
                      Even on my Acura Integra a 10 lb difference in the flywheel didn't make much of a change. And that car is torque needy. Unlike the M50.

                      All I want to know is, is there some reason the E flywheel wont work? I'll be finding that out today anyways and will post up my findings.
                      Your signature picture has been removed since it contained the Photobucket "upgrade your account" image.

                      "I cannot undertake to lay my finger on that article of the Constitution which granted a right to Congress of expending, on objects of benevolence, the money of their constituents. Charity is no part of the legislative duty of the [federal] government." ~ James Madison

                      ‎"If you've got a business, you didn't build that. Somebody else made that happen" Barack Obama

                      Comment

                        #12
                        Most dual mass flywheels are actually two seperate pieces that move back and forth. I don't have access to an "E" dualmass, but this is how it is on the E36 dual mass flywheels (I have 6 of them). You can move the upper and lower plates back and forth.

                        Comment

                          #13
                          Ah, I can see how that would make the clutch feel weird. The E flywheel doesn't have any moving parts. It is a two piece, one being the ring gear and the other the "mass" or main body of the flywheel. It's just thicker than the I flywheel, from what I've gathered.
                          Your signature picture has been removed since it contained the Photobucket "upgrade your account" image.

                          "I cannot undertake to lay my finger on that article of the Constitution which granted a right to Congress of expending, on objects of benevolence, the money of their constituents. Charity is no part of the legislative duty of the [federal] government." ~ James Madison

                          ‎"If you've got a business, you didn't build that. Somebody else made that happen" Barack Obama

                          Comment

                            #14
                            I have the tranny on the block. I measured the distance the pushrod in the clutch slave has left to travel. A full 1.4375". That's with the release bearing touching the splines of the pressure plate. I'd say it looks like it will work.
                            The tranny, flywheel and clutch assembly was all out of an 86 325E.
                            Your signature picture has been removed since it contained the Photobucket "upgrade your account" image.

                            "I cannot undertake to lay my finger on that article of the Constitution which granted a right to Congress of expending, on objects of benevolence, the money of their constituents. Charity is no part of the legislative duty of the [federal] government." ~ James Madison

                            ‎"If you've got a business, you didn't build that. Somebody else made that happen" Barack Obama

                            Comment

                              #15
                              Originally posted by joshh View Post
                              I have the tranny on the block. I measured the distance the pushrod in the clutch slave has left to travel. A full 1.4375". That's with the release bearing touching the splines of the pressure plate. I'd say it looks like it will work.
                              The tranny, flywheel and clutch assembly was all out of an 86 325E.
                              you should theoretically be using the the clutch slave from the E, but do have the m50 gearbox slave in hand, just incase the E pushrod is too short

                              check if the flywheel clears the oilpan too, i have heard those with e36 engines that fitted the e34 oilpan had to grind part of the flywheel especially those who used the m20 single mass.

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