Announcement

Collapse
No announcement yet.

Twin Mass vs Single Mass Flywheel

Collapse
X
Collapse
 
  • Page of 1
  • Filter
  • Time
  • Show
Clear All
new posts
Previous template Next
    #1

    Twin Mass vs Single Mass Flywheel

    Could someone explain to my a little bit about the differences between single and twin mass flywheels? I know that twin mass flywheels look like two pieces stuck together but what are the performance differences? What cars came with the different flywheels? How much different is their in their weight? Is twin mass really double the mass of single mass?

    Here is the information I got when I asked bavauto:

    Single Mass were on cars produced june 86 and earlier.

    Twin Mass Flywheels are more stable and more forgiving and give a smoother ride. They said that twin mass flywheels can't be shaved down, only single mass can be lightened.

    I have both flywheels, but I don't know which one I should put in my 87 eta. I think it has dual mass right now but I want to put single mass in and have it lightened!

    I'm need to do the engine swap before thanksgiving!

    Any Info would be greatly appreciated!
    West German BMWs, they just don't make the same as they did before the wall fell.
    ^Case in point: Auto-Repair Technology. Everytime my car isn't starting or acting up I let it sit, sometimes for an hour, sometimes for days. But it eventually fixes itself.
    Tags: None
    #2
    Not sure dual mass are double the weight of a single but they are heavier. When I did my 24v swap, my 85 eta had a dual so I found a single mass and had it shaved down.
    sigpic

    Comment

      #3
      dual mass is like 25lbs, single mass is about 17lbs and can be shaved to 12-13.
      Build thread

      Bimmerlabs

      Comment

        #4
        So single mass is the way to go eh? How much difference does the lightening make?

        Is it more or less noticable than a performance chip?
        West German BMWs, they just don't make the same as they did before the wall fell.
        ^Case in point: Auto-Repair Technology. Everytime my car isn't starting or acting up I let it sit, sometimes for an hour, sometimes for days. But it eventually fixes itself.

        Comment

          #5
          i did the M20 single mass on my M50 i had it lightened down about 5 lbs or so(its all the shop would do) and rebalanced. paired with a 6 puck ceramic disk unsprung hub. in the M20 it would hold no matter what i did and it r3v'd like none other, and from what i hear it makes the M50 r3v like a beast. also i have a RD chip with a k&n intake and "SS" reps on the way so i can imagine that it makes a great difference on a 24v, cuz for the short life it had the M20 was amazing
          "God created turbo lag to give V8's a chance" Taylor D.

          Comment

            #6
            Originally posted by NeoMishMoo View Post
            So single mass is the way to go eh? How much difference does the lightening make?

            Is it more or less noticable than a performance chip?
            It's a different kind of upgrade than a chip. You'll notice the chip whenever you get on it. You'll notice the flywheel in first and second and maybe a bit in third gear, and the car will rev (more) effortlessly.

            The M50 came stock with a heavy dual-mass flywheel, so an "i" single-mass shaved down will do wonders for it comparatively.
            paint sucks

            Comment

              #7
              The mechanic refused to shave my flywheel he said that it wouldn't make any difference. I told him that I wanted it done anyway but he just told me that if I wanted to notice a difference then he would put a nitrous system in my car....

              So I'm riding stock flywheel still, but at least I got rid of my twin mass and I have the single mass, I would still like to get it shaved though :(
              West German BMWs, they just don't make the same as they did before the wall fell.
              ^Case in point: Auto-Repair Technology. Everytime my car isn't starting or acting up I let it sit, sometimes for an hour, sometimes for days. But it eventually fixes itself.

              Comment

                #8
                The dual mass flywheels are not serviceable and can be problematic if the springs between the two halves fail. The single mass is more reliable and the lower weight can allow the engine to rev a bit easier.

                I converted my 87 325e from dual to single mass (stock weight) and to be honest I didn't notice much difference, but it's a race car so the extra degree of simplicity appeals to me.

                Either way you go, I would HIGHLY recommend you get the crank position reference pin welded onto the flywheel.
                The Homer: Powerful like a gorilla, yet soft and yielding like a Nerf ball.

                Comment

                  #9
                  Originally posted by LTDScott View Post
                  Either way you go, I would HIGHLY recommend you get the crank position reference pin welded onto the flywheel.

                  ? Damn just put my transmission back together, why do you suggest this? What does it do, or what does it prevent from happening (sorry I know little about flywheels).
                  West German BMWs, they just don't make the same as they did before the wall fell.
                  ^Case in point: Auto-Repair Technology. Everytime my car isn't starting or acting up I let it sit, sometimes for an hour, sometimes for days. But it eventually fixes itself.

                  Comment

                    #10
                    It's a little bit off topic but don't want to open a new thread... Can someone tell me could I combine m20 single mass flywheel with m20 pressure plate, with m50 clutch disc??? If answer is no, why? I want to have lightened flywhell but i also want to keep an ZF tranny... Engine will probably be turboed and getrag is not so strong as ZF... I hope that problem is not in release bearing....

                    Comment

                      #11
                      Srry to resurrect ths thread but this caught my eye... I have a single mass flywheel from a 87e with reference pins, I want to put it into a later model and was wondering if there's anything needs to be done with the reference pin or any other issue that I need addressed, any info is necessary so chime in...



                      Originally posted by LTDScott View Post
                      The dual mass flywheels are not serviceable and can be problematic if the springs between the two halves fail. The single mass is more reliable and the lower weight can allow the engine to rev a bit easier.

                      I converted my 87 325e from dual to single mass (stock weight) and to be honest I didn't notice much difference, but it's a race car so the extra degree of simplicity appeals to me.

                      Either way you go, I would HIGHLY recommend you get the crank position reference pin welded onto the flywheel.

                      Comment

                        #12
                        you only need the reference pin if you have an eta, if it's a 325i or a seta then you can remove it.
                        Build thread

                        Bimmerlabs

                        Comment

                          #13
                          Thnx 4 tha info. Any good shop U knw to machine a flywheel in Tacoma...


                          Originally posted by nando View Post
                          you only need the reference pin if you have an eta, if it's a 325i or a seta then you can remove it.

                          Comment

                          Previous template Next
                          Working...
                          X