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Car related - Dual Mass Flywheels

Discussion in 'General chit chat' started by Whistler, Dec 22, 2016.

  1. Whistler

    Whistler Donator

    Messages:
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    Location:
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    Dual mass flywheels (DMF) make what should be a relatively inexpensive clutch change into a major financial event as they generally have to be changed at the same time, and cost 2 or 3 times more than the clutch itself. Most popular makes now seem to have a "traditional" single mass flywheel (SMF) replacement option with all sorts of benefits claimed - but has anyone on here actually had one fitted and lived with it for a while ? I don't mean a track day car or a dedicated offroader, I mean a daily driver, 10k plus miles a year on it ? I'm about to do a clutch change and am considering the options :rolleyes:
     
  2. Darren Petts

    Darren Petts Temporarily Alive

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    Location:
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    Many DMF cars have SMF options now. The DMF is an answer to a problem nobody knew existed in that it is designed to reduce vibration and harshness. My last car, a Kia Rio diesel, had a SMF from the factory and was neither a jackhammer nor an air chisel. It was perfectly fine without one. Any car with a DMF can be swapped to a SMF with almost no downside. You'll probably need a measuring instrument to spot the miniscule extra vibration transmitted, if any. It's worth saying that a knackered DMF will transmit more issues to the driver than a SMF ever will. The chances of a SMF ever failing are remote in the extreme and cars have used them for over a century until someone dreamed the DMF up. If you can get a SMF replacement for a similar price to a DMF I'd regard it as a no brainer.
     
  3. surrey shooter

    surrey shooter Donator

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    Location:
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    My friends van has a SMF fitted and its like a tractor to drive. Had new clutch and DMF fitted couple months back in my transit nearly £1500 fords robbed me of :(
     
  4. RichieRich

    RichieRich Ping!

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    Location:
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    DMFs are fine until you start to hear a rattle coming from the transmission area of the engine bay.

    Most clutch plates have a set of damping springs in them, which effectively does what the DMF is designed to do, and those types of clutch plates have been around for decades for use with SMF's.

    DMF's are the work of the devil, along with EGR's and DPF's!!
     
  5. Conrad

    Conrad Member

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    Location:
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    Dual mass flywheels were developed to counter the vibrations from modern high performance diesel engines. If a DMF has worn out its because its done its job of absorbing vibrations. If you then replace it with a conventional flywheel, which you can in many cases the vibrations are still there but wont be absorbed by the flywheel, but by something else, there are cases of broken crankshafts. In the case of the Ford Transit if a DMF is replaced with a conventional flywheel then the front crankshaft pulley should be replaced with a torsional vibration damper.
     
  6. cloverleaf

    cloverleaf Super Moderator Staff Member Mod/Admin

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    Location:
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    To add to what's already been mentioned, DMF's came into being predominantly to protect the drivetrains of high-output three and four cylinder turbo diesel engines, which typically give relatively few servings of very high torque per crankshaft revolution. This gives rise to oscillations which can cause driver discomfort but also fatigue and destroy cranks and gearbox components.

    While this application is arguably valid, sadly it appears that manufacturers have jumped on the bandwagon and fitted them to absolutely everything (an nice little earner when you'd be well advised to replace this component when doing the clutch - which can easily double the cost of the whole job). I was looking at E46 BMW 330Cis some time ago - which also have DMF's fitted.. on a naturally aspirated petrol six pot is just taking the p*ss IMO :down:

    Not that I'm the oracle but on NA petrol engines I'd be well inclined to swap to a SMF, while I think if you're running a forced induction diesel lump you'd be well advised to replace the DMF and just suck up the cost.

    Yet another reason to run an older vehicle IMO...
     
  7. Mortimer

    Mortimer Lord Haw Haw

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    Location:
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    Just had a DMF replaced on a VW diesel. Would've cost about £1400 at a main dealer, but £850 at a German car specialist place.
     
  8. Compo

    Compo Donator

    Messages:
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    Location:
    Bradford
    i had the same problem with my honda accord honda wanted over 2 grand to replace clutch and dmf . i used a honda independent garage in manchester £950 for the same honda clutch and dmf fitted . still too expensive but better than 2 grand
     
  9. Whistler

    Whistler Donator

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    Location:
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    My car has a 4 cyl, 2.0 turbo diesel engine. So that would tend to steer me towards putting in a new DMF then I suppose.....
     

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