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  1. #1
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    jack hammer!!, post solid mass conversion effect??

    Hello alll.


    i have recently converted my DM flywheel to a solid variety. mainly because it is susggested that this is the best ting to do when the DM breaks down. since i have had it back it had been making a jack hammer kind of noise, my mechanic says he is unsure as what it can be. had the usual parts replaced with the solid mass (clutch plate, bearing etc.) the noise is only there when the car is ideling, at lights etc but also when not in gear at slow speeds. it does go away when i apply the clutch though.

    has this happened to any of you and what could be the cause??

    cheers guys, Dave

    55/a3/1.9tdisport

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  3. #2
    akash_sky1's Avatar
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    Brave move fitting a SMF to a 1.9TDI! Your mechanic should have warned you of the vastly increased NVH that comes with an SMF. The single piece nature and lower mass means the new flywheel is transmitting a lot more vibration to the rest of the drivetrain/ car, and this is at its most noticeable when idling. This is probably what your hearing as you say mainly at idle and coasting at low speeds unless the clutch is not engaged, ie not touching the new flywheel
    Last edited by akash_sky1; 23rd July 2011 at 17:35.
    A3 2.0TFSI quattro Sportback Lava Grey | | GIAC K03 Extreme Map | Autotech HPFP | RS4 Fuel Regulator | Neuspeed P-Flo | BSH PCV Fix | MV Sport DP | S3 Intake Cam | 285 BHP & 320 lb Ft Torque
    Votex Kit | TD Pro race 1.2 | Schwarze Audi Rings | Alu Rails | Sachs Clutch | H & R Now gone. Current- A5 Cab 2012


  4. #3
    Adam.'s Avatar
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    I had a smf on my old golf 110 tdi.

    You do get a bit of clutch chatter but it waas so much better to drive.

    Sounds normal to me!

  5. #4
    S3Alex's Avatar
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    Quote Originally Posted by davidashaigh View Post
    Hello alll.


    i have recently converted my DM flywheel to a solid variety. mainly because it is susggested that this is the best ting to do when the DM breaks down. since i have had it back it had been making a jack hammer kind of noise, my mechanic says he is unsure as what it can be. had the usual parts replaced with the solid mass (clutch plate, bearing etc.) the noise is only there when the car is ideling, at lights etc but also when not in gear at slow speeds. it does go away when i apply the clutch though.

    has this happened to any of you and what could be the cause??

    cheers guys, Dave

    55/a3/1.9tdisport
    I'm surprised your mechanic has no idea why it's doing this.

    It's simple mechanics,even to a mechanical moron like myself.....the purpose of a DMF is to damp and reduce vibrations of this sort,and it's a tuned mass damping system.

    Remove it,and all of the NVH it was damping out is free to pass through.

  6. #5
    devonmikeyboy's Avatar
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    Sounds like your "mechanic" don`t know ****e about mechanics to me. He obviously doesn`t have a clue how a DMF works or fitted to modern diesel cars. Fitting a SMF to anything other then a highly tuned diesel car is NOT the best thing to do when the DMF dies.
    06 Audi 2.0 PD140 Sport TDI Quattro S-LINE.
    Old engine 330 bhp @ flywheel 263 bhp @ wheel 490 lb torque. Audidriver write up HERE
    Now stripped and playing with an uprated Cryo treated engine fitted with bigger turbo,water/methanol,uprated injectors etc etc.Wanting 400 bhp and 500 lb torque.

    Other car 500+ bhp MK4 Golf R32 turbo.

 

 

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