Contour Enthusiasts Group Archives Forums Modifications Duratec Performance Crank Whip

The 2.5 Duratec is still in production...in Europe only...built now in Wales....and has a DMD as 'standard'.........

Without being a jerk.


I still dont understand why the jaguar x and s would not come with it if the dmd is such a needed thing. there are cars out there running 3.0 dura's with no DMD, only mondeo. why is that? if ford realizes this prb why arent they correcting it on other cars besides the mondeo? Just seeing that the Jag doesnt have it makes me wonder if it is needed. If there is one car that I could think of that would have it on, it would be the jag. I mean you are paying 30-40k on a car and they would know about the probs but yet not have a fix for it?


I also dont understand how the dmd can fix internal vibrations. I understand how it can calm down external vibrations, but no internal. There still has to be vibration in the crank and on the flywheel side of the engine.

I am not saying the Dmd doesnt stop vibrations. I just think it doesnt fix the prob everyone is talking about.



This has nothing to do with the water pump, they are on the same belt. water pump is ran on the cam not the crank.



Micah

Originally posted by Micah:

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Without being a jerk.


I still dont understand why the jaguar x and s would not come with it if the dmd is such a needed thing. there are cars out there running 3.0 dura's with no DMD, only mondeo. why is that? if ford realizes this prb why arent they correcting it on other cars besides the mondeo? Just seeing that the Jag doesnt have it makes me wonder if it is needed. If there is one car that I could think of that would have it on, it would be the jag. I mean you are paying 30-40k on a car and they would know about the probs but yet not have a fix for it?


Micah

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Why some Duratecs have it and some do not...this is my conjecture, not fact..

first see my above post on high RPMs = more crank whip = more problems
Now, with the ATX you rev much less than MTX cars...SVT>MTX>ATX

Mondeo, MTX -DMD
MPV, ATX - no DMD
Taurus, ATX - no DMD
Mazda 6, MTX - DMD
Now the Jag and LS I am not sure if NEW versions have DMD or not. Are you SURE the 2002 Jag lacks DMD??

And, to reverse the arguement if it were present mostly for improved NVH, what car deserves it more than Jag??

Again, this is my speculation.

Originally posted by Dan Nixon:

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Are you SURE the 2002 Jag lacks DMD??

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Yes

Well, thats interesting...you would think the jag would have the DMD for BOTH NVH and whip UNLESS.....it had another solution. For example, the Duratec derived SHO V8 had trimetal bearings to tolerate crank whip better. DMD is not ness the only solution, it may just be the cheaperst...

We now build/rebuild all our engines with Clevite 77 bearings!!!!

In reply to:

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Now, with the ATX you rev much less than MTX cars

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Mine gets up to 5k-6k just about everyday. I really should start thinking abotu getting a DMD. I have nearly 90k now anything to look for before getting it. I'd hate to spend a couple of hundred bucks only to have the engine go a couple of days/weeks later.

Originally posted by jlanger:

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In reply to:

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Now, with the ATX you rev much less than MTX cars

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Mine gets up to 5k-6k just about everyday.

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5-6k eh... That would be taking it easy for me.

Originally posted by Terry Haines:

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We now build/rebuild all our engines with Clevite 77 bearings!!!!

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ok, thats good, but back on the topic do you have any reason or thought of why it wasnt on the jags? or Ls? how does the dmd change crank whip on the flywheel side of the crank?

not trying to be a jerk just want to get on the subject again.




Micah

ATX's have torque converter, not solid flywheel. That might change the natural frequency of the crank enough that it isn't the problem it is on MTX's.