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  #1  
Old 12-15-2010, 02:12 PM
GGR GGR is offline
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Reinforced flexdisc with concave metal plates

Hi all,

Someone posted a link some time ago showing two concave metal plates put on each side of a flex disc. This was for Alfa Romeos but it may fit on MBs. I don't remember in which thread this was posted and couldn't find it. Could anyone re-direct me there?

Thanks!

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Old 12-15-2010, 03:57 PM
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190E 3.0-12v Turbo
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Old 12-15-2010, 09:12 PM
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Thanks!
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Old 12-16-2010, 09:22 AM
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So what are those wild and crazy guys doing for this when they put together the green wagon and those other MB diesel monsters?
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  #5  
Old 12-16-2010, 09:30 AM
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That's my concern. In my project the flex disk can reach 7000 rpm when it never was meant to go over 5500. It may well hold but I wouldn't like to have my legs whiped and cut at 250 km/h.
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Old 12-16-2010, 02:24 PM
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Some have machined them from aluminum, removed them, or upgrade to the 4-puck flange.
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  #7  
Old 12-19-2010, 12:01 PM
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would using an alloy spacer actually work?
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Old 12-19-2010, 01:59 PM
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Quote:
Originally Posted by nick.ged View Post
would using an alloy spacer actually work?
a solid spacer to replace the rubber bits?


no, unfortunately. it would essentially be a solid drive train and the vibration would be disastrous. for rigidity, u joints are the only way to go, but they'll increase wear on trans (5 speed i think you have) and differential.. having steel plates on either side of the rubber flex plate seems like the only alternative for rigidity without a lot of work
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  #9  
Old 12-19-2010, 02:26 PM
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Here are a couple examples. The first, a GTO. The second, a BMW, addressing the excessive rigidity with polyurethane inserts.
What you may also notice is that none of these innovative ideas are ever made for Mercedes'. I think it's safe to say the problem with the aftermarket for Benzes isn't that the necessary parts are too hard or complex to make, since, here they are in different dimensions. The problem is us. I wouldn't want to deal with most MB owners.

http://www.lethalperformance.com/04-06-pontiac-gto-driveline-driveshafts-and-loops-c-20_191_193/driveshaft-shop-04-05-gto-1000rwhp-aluminum-driveshaft-p-11987

http://www.revshift.com/shop/index.php?_a=viewProd&productId=76
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  #10  
Old 12-19-2010, 04:06 PM
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I've re-thought this whole 'flex disc' pita topic big time after reading the members' comments/suggestions on Joreto's thread again (link above by MagnumPI). I can't see the metal outer plates that are fitted via 3 of the bolt holes allowing much needed flex to take pressure off the trans.

nick.ged's suggestion of getting a nolethane disc custom made would be a great idea imo. I can't see more rigidity needed than that would provide?

That E30 BMW Flex Disc, listed in the 2nd link of magnum's post would appear to be a viable alternative. But, as with a solid nylon disc & metal inserts, that nick.ged suggested, would it be too rigid for longevity reasons/higher mileage-daily driver use (racing applications aside)

Also. Is higher revving the cause of flex discs failure? (worn/old discs aside, as I'm referring to newer, viable discs)
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Old 12-19-2010, 06:37 PM
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i think its the way the merc one is made, and the movement in the trans/engine assy that causes the disc to fail. my drive line shakes the most in reverse, and then slightly less in first (the two lowest gears) i am replacing three front do-nuts to every rear one.

don't think its a revs situation, am set for 7000 rpm, but often change around 6000, which is the same speed as a std power car.

fitting uprated gearbox and engine mounts should reduce the ware rate imho, by stopping the movement of the drive line.

really want to copy magnumpi's system with the spicer parts (pref in alloy) but am struggling to fine a supplier/ manufacturer in UK/Europe.
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"some mods improve your car and make it into something it never was, other mods, however, although essentially the same, are not, and make that car a ricer"

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Dont forget to polish it often
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Old 12-19-2010, 08:25 PM
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Really giving this some HD thought now as car sits in shop @ moment. Not overly thrilled reading about the power-soak effect you get from the rubber discs

I'm still concerned that nolethane discs, or inserts, will add undue stress to the trans & diff? The 300E introduced me to the flex disc/tailshaft design used by manufacturers. I'd never seen this set up prior. So I guess they aren't absolutely necessary but perhaps simply another "comfort" feature designed by manufacturer?

I know here down under, for a price you can have nolethane engine mounts made up from scratch. A mob down here in OZ (Brisbane) years ago would make an engine mount mould up for import cars that couldn't get parts here & had to pay through nose for them shipped from OS. They did need the old broken mount as a template, jigging it up from orig' part & "bob's your uncle"

I'm going to see whether a similar mob perhaps in VIC where I live can do the same with the orig' flex disc? Worth a try

For now I am just replacing all mounts in car with new ones except the rear flex disc. There is a rear one right? I can't remember as I haven't looked underneath car for a while lol.....

Anyone have an update on success with sourcing a nolethane disc from where ever they can?
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Last edited by BAD300; 12-20-2010 at 10:25 PM.
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  #13  
Old 12-20-2010, 10:02 PM
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Engine Steady-Vs-Driveline wind-up

Merc flex discs are much more robust than the Alfa Romeo flex discs those encasement plates are designed to reinforce. ALFA flex discs are very soft and tear up easily.

We have not had problems with Merc flex discs. They do their job and last as long as they are fresh, IE treated as regular replacement items.

More annoying is driveline wind-up due to soft or semi-collapsed factory engine mounts. The engine flopping around on acceleration & deceleration dullens sharpness and probably contributes to the deterioration of the flex discs.

Here is a write-up we did on reducing engine torque reaction and driveline wind-up.



Regards,
bobf
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Old 03-03-2011, 10:08 PM
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Can someone post the doc as an attachment ?

Thanks,
:-) neil
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  #15  
Old 03-08-2011, 07:17 AM
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Engine steady

Here is a fresh link to the write-up.

Some one got into my files and deleted a few. Not nice.



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bobf

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