Duel mass flywheels

Post by **St Jimmy** » Tue Jul 28, 2009 6:47 pm

My son's bmw blew the clutch up last night, What we want to know can you machine duel mass flywheels, as a new one is around 600.00 and we need it back on the road

Post by **Pharb** » Tue Jul 28, 2009 7:06 pm

$600 sounds cheap for a dual mass f/w.

Had a local brake and clutch specialist (now retired

) who claimed to be able to machine them and he had a developed a good enough rep with me for me to trust him.

Anyone else - I don't know!!!

Peter H

Post by **dogbreath_48** » Tue Jul 28, 2009 7:06 pm

Can someone also explain what exactly a dual mass flywheel is? The only one i've seen looked like a conventional flywheel at a glance.

Edit: Did my own research
Good video:
http://www.youtube.com/watch?v=YnaXB8q3uzQ

Post by **St Jimmy** » Wed Jul 29, 2009 8:40 am

Anyone

Post by **chimpboy** » Wed Jul 29, 2009 9:51 am

boner59 wrote:Anyone

I've heard you can't, but sheesh you hear stuff all the time so I don't know

In some vehicles people throw them away and put in a solid flywheel instead. I would be surprised if there wasn't a BMW solid flywheel that dropped straight in given how their models evolve.

Post by **MICK77** » Wed Jul 29, 2009 10:48 am

$600 is fawking cheap for a dual mass flywheel!

Subaru DMF have a RRP $1878.90 inc. GST

These flywheels cannot be machined. They are a throw away item.

Many manufacturers have used DMF in the past with varying degrees of success. Subaru & Nissan have had many issues with them.

We change the DMF for a WAD flywheel and clutch setup. This setup is then easily replaced when worn and the flywheel can be machined.

Cheers,

Micko

Post by **Kramer** » Wed Jul 29, 2009 11:08 am

I am still a little unsure what is the point of dual mass fly wheels are they there just to get rid of driveline vibrations and to stop a little backlash?

Post by **chimpboy** » Wed Jul 29, 2009 11:15 am

Kramer wrote:are they there just to get rid of driveline vibrations and to stop a little backlash?

I think so... especially in cases where the motors in front of them are a bit inherently choppy and rough, eg V6 engines, diesels, etc.

I think they maybe can be machined but that it's the stuff in the middle that fails, not the surface, so machining them is pointless..?

Post by **Guy** » Wed Jul 29, 2009 12:01 pm

I dont have sound on this poota at the moment, but the animation is easy enough to follow
http://www.youtube.com/watch?v=YnaXB8q3uzQ

Otherwise to find out go to

www.google.com
Type in
"what is a dual mass flywheel"

And look at all the info that comes up

OR as Grimbo would say

USE THE SEARCH

Post by **bogged** » Wed Jul 29, 2009 1:00 pm

MICK77 wrote:$600 is fawking cheap for a dual mass flywheel!

Subaru DMF have a RRP $1878.90 inc. GST

These flywheels cannot be machined. They are a throw away item

Grenade ones can be machined...

But $600?? I think someone fuked up there.
I'd be buying a few at that price, thats extremely cheap.. you dont wanna price the grenade one.

Looked into gettin a normal flywheel?? Most grenade owners change out the dualmass for a real one

Post by **Yom** » Wed Jul 29, 2009 1:42 pm

bogged wrote:
MICK77 wrote:$600 is fawking cheap for a dual mass flywheel!

Subaru DMF have a RRP $1878.90 inc. GST

These flywheels cannot be machined. They are a throw away item
Grenade ones can be machined...

But $600?? I think someone fuked up there.
I'd be buying a few at that price, thats extremely cheap.. you dont wanna price the grenade one.

Looked into gettin a normal flywheel?? Most grenade owners change out the dualmass for a real one

Who told you that?

99.9% they're wrong.

You can't machine a surface which is supported by gel blocks.

I have heard of people welding the DMF up so it acts like a solid flywheel but this stinks of dodgey to me.

Post by RN » Wed Jul 29, 2009 1:48 pm

Moved to Gen Tech by me.

Post by **bogged** » Wed Jul 29, 2009 2:38 pm

Yom wrote:Who told you that.

people in my old club that had it done...

Post by **PJ.zook** » Wed Jul 29, 2009 5:42 pm

They are a necessary expensive evil

Post by **IN24BZ** » Wed Jul 29, 2009 7:09 pm

they can be machined , carters clutch in maitland NSW i belive can do it. we have had one or two done before , ask them also about solid conversions as they have supplied my dealership with some of them before... but as said 660 is cheap!

Post by **PGS 4WD** » Mon Aug 03, 2009 9:22 pm

dogbreath_48 wrote:Can someone also explain what exactly a dual mass flywheel is? The only one i've seen looked like a conventional flywheel at a glance.

Edit: Did my own research
Good video:
http://www.youtube.com/watch?v=YnaXB8q3uzQ

They are two piece with a cushion joint that assists in removing harmonics form the crankshaft and allows for softer more forgiving clutch plate springs in the sprung center. Mutch like the harmonic balancer on the front.

Joel

Post by **patrol man** » Tue Aug 04, 2009 12:14 am

They can be machined they just need to be supported by the drive face to mount them when machining,

$600 is cheap, try buying one for a Nissan

Post by **croozy** » Tue Aug 04, 2009 6:54 pm

I have sold a few dual mass to standard conversions but from memory they were nissan patrol ones, it's been a while since one came through our shop. So might be worth a look, however it's not an option for all vehicles fitted with dual mass gear.

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