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Trophy Blue MG ZT
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Discussion Starter #1
Hi guys,

I have a 2004 MG ZT 120 1.8.

I ordered a clutch and slave with my reg number from eurocar at a good price.

My mechanic has discovered to his and my surprise that my zt has a DMF with 50mm of travel, so totally gone.

My question is should it have a DMF in the first place?

The clutch I got from eurocar is for a solid.

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rover_600
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Sadly our manual cars have DMFs, the reasoning in the Factory drawing room was that it made for a smoother gear change, also one young whipper snapper suggested that it would ease the strain on the crankshaft.
Duncan Was the name of the man who told me this. To explain who he was is difficult he was the chief design engineer for a company called Austin Rover. He was also the man who designed the concept car upon which our cars based. Though BMW took the car and shortened it by 10 inches as the car in its original design would have been a direct competitor for their 5 series.
The need for a DMF has been debated by many over the years.
From a pure engineering point of view none of the power units fitted to the body whither K series, V6, V8, or diesel require a dual mass flywheel all it does ? Is make for a smoother power take up upon gear change, the fact that you can get 2 inches of play in the flywheel again purely from an engineering viewpoint suggests that either the engines don’t need them or they are not up to the task for which they are being used.
I have driven 75s with DMFs and have also driven them with solid flywheels, I would anyone without prior knowledge to be able to tell the difference.
The cars had them fitted as standard.
There is no reason why, according to Duncan why the engines fitted need them, sadly as he passed away nearly ten years ago, and he can not defend his corner.
As I said many will tell you the crankshaft needs them.
In my opinion this is utter nonsense, DMFs are fitted to make the driving experience more comfortable when changing through the gear box, they also forgive those who take their foot off the third pedal too quickly.
As an old mans car we can control our left legs and if we can’t we buy automatics.
A solid flywheel is available at about half the price of DMF. The choice is yours.
Kind regards
Alan


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Trophy Blue MG ZT
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Discussion Starter #3
Thank you for your quick and concise reply.

I've been frantically trying to find either for the 1.8 na but everywhere was shutting down for the day and couldn't get a straight answer.

I found a DMF for the turbo version, but nobody could tell me if the crank timing is the same as the na version.

Do you know?

Any help would be much appreciated.

Kindest regards

Michael

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rover_600
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To the best of my knowledge the 1.8k series is the same whither turbo or naturally aspirated whither in a Rover an MG or a Lotus.
The type of flywheel should not affect the changing of the timing belt. Never did when I used to do them the locking tool I used had no preference.
Alan


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Trophy Blue MG ZT
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Discussion Starter #5
Hi Alan,

I was thinking maybe the crank sensor and the way it sensed was different, flywheel teeth or cutouts pulse or wave form?

Or am I overthinking as usual.

Kindest regards

Michael

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rover_600
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It is not A problem that I have ever come across on the K series rovers I had nor on the Elise. The lotus has a solid flywheel.
I have to confess to fitting a solid flywheel to my 1.8 at 135,000,
It was a turbo model and by that time had had a lotus head gasket fitted.
Alan


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Discussion Starter #7
Hi Alan thanks again for the info.

My ZT is currently blocking a bay at the garage I just didn't want to buy a DMF flywheel at about £400 and it turn out to be wrong.

Now the budget has already been blown out of the water.

I'm thinking just put it back together and I'll sort it on the drive myself.

Michael


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rover_600
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There are several K series specialists up and down the country. Sadly I am now long out of the game. There must be members out there who have used them over the years they specialise in sorting out the dreaded K series head gasket problems. Many of them used to carry several options of of cranks cams pistons and con rods, these guys usually carried a range of brake discs and pads also clutches and flywheels. The company I used to deal with were about 10 miles from the Silverstone track, Lotus was his game and shipped to me overnight up hear in Scotland he even had his own range of pistons cranks and cams. Sorry I can’t remember his company name.
Come on guys flywheel suppliers.
Alan


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rover_600
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Hi Alan thanks again for the info.

My ZT is currently blocking a bay at the garage I just didn't want to buy a DMF flywheel at about £400 and it turn out to be wrong.

Now the budget has already been blown out of the water.

I'm thinking just put it back together and I'll sort it on the drive myself.

Michael


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Oh to be young, I remember it well sadly even doing a service these days takes days of limbering up, and I am driving automatic oil burners these days.


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Discussion Starter #10
Hi Alan I'm a bit like that now lol.

I slipped a disc afew year ago after 3 ops still bugs the hell out of me with the shooting pain and electric shocks.

Sometimes needs must but then sometimes pay someone else.

Michael

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The K Series doesn't need a DMF other than the con rods being 2mm shorter it's the same as a standard 1.8 other than VVC pistons, it's there for a smooth idle on the ZT as it's the top spec model. I would say possibly as well to help the vibration from the transmission as the Mini's etc also use a DMF.
 

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Doesn't work when idling and does not remove vibration either. It just acts as a damper for the crankshaft on poor gear changes.
 

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Discussion Starter #15
I'm so considering just welding the thing.

357 quid for the turbo version which I've been assured is the one to fit.

I'm pretty sure I can use a clutch correctly

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Discussion Starter #17
Obviously I will have make sure to balance it and get out the dti to measure for runout.

I think between the weight of the DMF and the sprung clutch plate I probably won't notice any difference.


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As I said I have driven both solid and DMF cars. I defy anyone to tell the difference unless they are told.
The Lotus had a solid flywheel and drove beautifully both on and off track.
Alan


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Discussion Starter #19
The ZT is a little bit heavier than the lotus.

I'm only guessing about 450kg heavier.

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I can’t remember the exact weight of the Lotus but seem to Remember it being less than a Tonne with me in it on the track scales. If that is the case it would be a good 820kg + lighter.
My son in law has it now, but it’s parked down at his dads some 460 miles away. So difficult to check. Now I know why it went so well. ‘‘Twas fully tuned and only just driveable on the road. Touch the loud pedal and you were breaking the law.
Now I can just manage in it but a Crain is needed to get me out.
Don’t you just love old age?
Alan


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