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Old 05-11-2008   #31
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Re: Dual Mass Flywheel???

I read an interesting article in a Trade mag recently, covering aspects of DMF testing. Its quite a complex procedure to do correctly with the right tools, with backlash measurements and torque requirements etc. Creeping along in heavy traffic is stated as a possible risk as the constant on / off of high torque on a hevily laden vehicle is quite stressful to it. But as Hellcat has stated above they are not an achilles heel, thay have brought the smooth diesel motoring experience we now have to over 90% of all manufacturers diesel vehicles.

DMF's are very commonplace.
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Old 05-11-2008   #32
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Re: Dual Mass Flywheel???

Quote Originally Posted by johnson550 View Post
Youve missed out the two rather large springs
What springs?



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Old 05-11-2008   #33
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Re: Dual Mass Flywheel???

Quote Originally Posted by Hellcat View Post
What springs?



If you were to take it apart you would find two springs inside. They are round the edges you can actually move the two halves of the flywheel I hope this link works it explains exactly
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Old 05-11-2008   #34
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Re: Dual Mass Flywheel???

Nice link - never taken one of these apart before. So I take it the spring takes the majority of the power hit with the rubber just dialing out the small shocks?
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Old 05-11-2008   #35
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Re: Dual Mass Flywheel???

Quote Originally Posted by Ffoxy View Post
Creeping along in heavy traffic is stated as a possible risk as the constant on / off of high torque on a hevily laden vehicle is quite stressful to it.
I mentioned this eariler in the thread but didn't get a reply

Quote Originally Posted by RichDoblo120 View Post
I've heard recently somewhere (can't remember where) that dual mass flywheels can be damaged by doing alot of creeping along in 1st gear in traffic.

does anyone know if this is true?
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Old 05-11-2008   #36
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Re: Dual Mass Flywheel???

Interesting animation. I wonder how much energy is lost compressing the springs? Obviously you get most of it back when the spring returns to its original length but there must be some lost as heat/noise.
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Old 01-09-2009   #37
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Re: Dual Mass Flywheel???

This is an old post, I know, but I found the following description of the DMF. Most interesting was that it suggests that the design is mainly for the 200 - 400 rpm range:

if you paste:-

moodle.student.cnwl.ac.uk/moodledata_shared/cdx%20etextbook/dswmedia/trans/clutchMan/clutches/dualmassflywheels.html

you can see what they say.

This suggests to me that stop/start motoring is one contributor to failure. Doesn't bode well for the stop/start technology we are seeing more frequently.

Mike

(I did post it as a link, but it seems forum rules say I can't do that until I am a little older).
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Old 01-09-2009   #38
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Re: Dual Mass Flywheel???

There you go

Thanks for the info, very interesting.
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Old 01-09-2009   #39
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Re: Dual Mass Flywheel???

54,000 miles on my DMF now ater a Red Dot remap to 194 Bhp at 32,000 miles.

Still smooth as a babys soft bits and no judder or slip....

There are non DMF replacements available now, cheaper but transmits the engine and gearbox vibes a bit more so not such a "cultured" ride.
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Old 01-09-2009   #40
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Re: Dual Mass Flywheel???

Start/Stop shouldn't be confused with the 'start/stop' traffic. Switching the engine off will save the clutch compared to people often sitting with the engine idling, clutch pressed and the car in 1st gear.
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Old 01-09-2009   #41
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Re: Dual Mass Flywheel???

Really interesting and glad I read this prior to taking my car in next week - I suspect I have the same problem - hopefully they'll replace at least the DMF (if that's what it is) under warranty which runs out in December.

It's a 2006 120bhp that's done only 14,900 miles and the clutch is terrible. Has gradually got worse - originaly just bad after long runs in traffic. Now very hit and miss whether the clutch will be very stiff and constant juddering on take off.

Was a bit worried the garage would just say "new clutch mate" but now I'm not so sure. We had a gearbox leak repaired under warranty but assume that was external not something that's contaminated the clutch plate. Can't see why that would make the pedal so stiff?

Taking it in next so will let you know how we get on.
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Old 02-09-2009   #42
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Re: Dual Mass Flywheel???

Quote Quote:
Start/Stop shouldn't be confused with the 'start/stop' traffic
I'm not confusing it, the article states that the real problem area for the dual mass flywheel is 200 to 400 rpm, i.e. every time you start/stop the engine.

Maybe the problem is short runs rather than giving it some welly. Long motorway runs look good.

Mike
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Old 01-01-2010   #43
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Re: Dual Mass Flywheel???

Hi all & happy ney year.
Can anyone help?I'm thinking of buying a 2000 multipla jtd,with suspect dual mass flywheel problem.I have been offered one from a 52 punto jtd,is this the same,or should I avoid at all costs?
any help will be much appreciated.Adee.
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Old 01-01-2010   #44
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Re: Dual Mass Flywheel???

Hi again,just had another thought,is there any reason why the dual mass jobbie can't be junked,and a solid flywheel put in it's place?is there any reason why one can't be made to the same spec/weight etc?
I am a recently redundant precision engineer,with lathes,mills etc,so making one wouldn't be too much of a problem.would there be any demand for these????????
any feedback would be gratefully recieved.
Adee.
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Old 01-01-2010   #45
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Re: Dual Mass Flywheel???

DMF to solid flywheel conversion kits are available from several sources but I believe you have to have the complete kit. i.e. flywheel and clutch.

I've not seen one for the Doblo but there's one for the Scudo/Ulysse on eBay.

http://cgi.ebay.co.uk/FIAT-SCUDO-ULYSSE-2-0-JTD-SOLID-FLYWHEEL-CONVERSION-KIT_W0QQitemZ220403427087QQcmdZViewItemQQptZUK_Car sParts_Vehicles_CarParts_SM?hash=item335111670f

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