Dual Mass flywheels

[HDi fun]

How about a dedicated thread for dual-mass-f***in-flywheels?

[waynne]

Done the new thread. (You can start a new thread whenever you want - if you can't then I've set the board up wrong!)

What is a dual mass Flywheel? How do they work and is this a diesel only thing?

[HDi fun]

No - they're becoming common on petrols as well. Diesel engines do create more vibration than petrols so they tend to benefit more.

I'll have a look around for a good description of one of these -I sort of understand wat they do but can't really explain it very well.

[waynne]

I know what you mean. You get the theory but want to understand the mechanics of it. I'll wait with baited breath!

[pgarner]

waynne the a3 should have a DMF i know the bora does ?

from what i understand the flywheel is split in 2 the inside and outside of it are joined by springs. vibrations are lost through the springs.
they are common on most larger saloons and prestige makes are the drivers want a more smoother drive

[waynne]

I never realised that! WOW! I had one all along. So there are 2 flywheels connected by springs, this sounds clever.

[HDi fun]

PG's done a nice job of that - that's exactly what it does. I think tuned diesels are a DMF's nemesis. There's just too much torque. I'm advised not to replace with a solid f/w as this can cause massive crankshaft torsional stresses.

[HDi fun]

Got a call today to say that warranty will cover DMF replacement parts and labour. All I've have to fork out is £20 for transmission oil and same again for new driveshaft seals.

So, get a new clutch dropped in at the same time and I think Paul's just acquitted himself quite nicely!!

Once in a while things go my way.

[waynne]

That is pretty lucky. If it was me the clutch would go the week after this work was carried out.

[HDi fun]

I have been nursing it for four months, so I've kind of paid already.