Dual Mass Resurfacing
Thread Starter
Pro
Joined: Oct 2004
Posts: 653
Likes: 10
From: Walton Kentucky
Dual Mass Resurfacing
Guys have any of you heard of www.dualmassinc.com.
They can resurface your dual mass for $200.
Have any of you used them. They are also willing to offer group discounts!
They can resurface your dual mass for $200.
Have any of you used them. They are also willing to offer group discounts!
Elite Torch Red Member
Joined: Sep 1999
Posts: 57,805
Likes: 23
From: Exit 89 GSP,Lakewood,NJ The Land Of Mojo
Cental/South NJ Events Coordinator
CI 1-2-3-4-5-6-7-8-9-10-11-12 Vet
CI-II Burnout & Drag Champ
St. Jude Donor '03-'04-'05-'06-'07
Originally Posted by tvetta
Guys have any of you heard of dualmassinc.
They can resurface your dual mass for $200.
Have any of you used them. They are also willing to offer group discounts!
They can resurface your dual mass for $200.
Have any of you used them. They are also willing to offer group discounts!
Team Owner
Joined: Aug 2000
Posts: 40,156
Likes: 45
From: San Pedro CA
Check the disclaimer at the bottom of their site:
"Warning: The resurfacing process performed by Dualmass Inc. is not recommended by the original equipment manufacturer. By using DualMass Inc. services and not buying a new flywheel from the original equipment manufacturer the customer assumes full responsibility for their own actions. DualMass Inc. WILL NOT be held responsible for any damages to persons or property up to and including death."
Emphasis added.
"Warning: The resurfacing process performed by Dualmass Inc. is not recommended by the original equipment manufacturer. By using DualMass Inc. services and not buying a new flywheel from the original equipment manufacturer the customer assumes full responsibility for their own actions. DualMass Inc. WILL NOT be held responsible for any damages to persons or property up to and including death."
Emphasis added.
Drifting
Joined: Jul 2003
Posts: 1,868
Likes: 294
From: West of Burlington, Ontario Canada
Iv'e machined three of these flywheels. One was a ZR1. The clutch and flywheel are manufactured by Luk (at least the C4's are).
http://www.lukusa.com/products/index.phtml?page=dmf
Though they don't recommend resurfacing (they also sell new ones). If it is within backlash specs and If you find a shop that will take the effort to clamp the flywheel down securely and remove small amounts at a time, this can be done easily. I don't recommend it be done more than once and no more than .040" be taken off. If I were to replace the flywheel I would not use a new Dual Mass. I would be calling Doug Rippie and get a solid flywheel. Less money and no worries. The first gear idle rattle is not nearly as bad as what it's reported to be.
Jim
http://www.lukusa.com/products/index.phtml?page=dmf
Though they don't recommend resurfacing (they also sell new ones). If it is within backlash specs and If you find a shop that will take the effort to clamp the flywheel down securely and remove small amounts at a time, this can be done easily. I don't recommend it be done more than once and no more than .040" be taken off. If I were to replace the flywheel I would not use a new Dual Mass. I would be calling Doug Rippie and get a solid flywheel. Less money and no worries. The first gear idle rattle is not nearly as bad as what it's reported to be.
Jim
Last edited by GMJim; Dec 12, 2004 at 08:19 PM.
Thread Starter
Pro
Joined: Oct 2004
Posts: 653
Likes: 10
From: Walton Kentucky
Originally Posted by GMJim
Iv'e machined three of these flywheels. One was a ZR1. The clutch and flywheel are manufactured by Luk (at least the C4's are).
http://www.lukusa.com/products/index.phtml?page=dmf
Though they don't recommend resurfacing (they also sell new ones). If it is within backlash specs and If you find a shop that will take the effort to clamp the flywheel down securely and remove small amounts at a time, this can be done easily. I don't recommend it be done more than once and no more than .040" be taken off. If I were to replace the flywheel I would not use a new Dual Mass. I would be calling Doug Rippie and get a solid flywheel. Less money and no worries. The first gear idle rattle is not nearly as bad as what it's reported to be.
Jim
http://www.lukusa.com/products/index.phtml?page=dmf
Though they don't recommend resurfacing (they also sell new ones). If it is within backlash specs and If you find a shop that will take the effort to clamp the flywheel down securely and remove small amounts at a time, this can be done easily. I don't recommend it be done more than once and no more than .040" be taken off. If I were to replace the flywheel I would not use a new Dual Mass. I would be calling Doug Rippie and get a solid flywheel. Less money and no worries. The first gear idle rattle is not nearly as bad as what it's reported to be.
Jim
Drifting
Joined: Jul 2003
Posts: 1,868
Likes: 294
From: West of Burlington, Ontario Canada
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)
Joe Kucinski
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!
Michael S. Palmer
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2
Michael S. Palmer
Team Owner
Joined: Aug 2000
Posts: 40,156
Likes: 45
From: San Pedro CA
GMJim - The flywheel and clutches are exclusively made by Valeo.
All pressure plates are Valeo... aftermarket then tweeks as needed.
The friction discs come from multiple sources - Luk, Valeo, etc.
The downside of turning one of these flywheels: If your clutch lasts a normal life, lets say 100k miles, you only have 20k miles left in the flywheel. I don't see a reason to do this. If you race and blow the clutch at 50k miles, who's to say the flywheel is structurally sound?
The last time I checked, the flywheels from DRM are unavaliable. They bought a stash of F-Body flywheels, then turned them down the required .090. I contacted them 2.5 years ago, and they were out of them, with no plans of getting more.
The bottom line, just buy an F-Body flywheel, and have it cut down .090.
What is needed is a rebuild facility. Someone who can cut the friction surface, then replace the springs and ball bearings inside.
This would effectively double the lifespan of the flywheel.
It would make sense to disassemble the flywheel, resurface the friction surface, then reassemble with new internals.
This would be worth $200.00.
All pressure plates are Valeo... aftermarket then tweeks as needed.
The friction discs come from multiple sources - Luk, Valeo, etc.
The downside of turning one of these flywheels: If your clutch lasts a normal life, lets say 100k miles, you only have 20k miles left in the flywheel. I don't see a reason to do this. If you race and blow the clutch at 50k miles, who's to say the flywheel is structurally sound?
The last time I checked, the flywheels from DRM are unavaliable. They bought a stash of F-Body flywheels, then turned them down the required .090. I contacted them 2.5 years ago, and they were out of them, with no plans of getting more.
The bottom line, just buy an F-Body flywheel, and have it cut down .090.
What is needed is a rebuild facility. Someone who can cut the friction surface, then replace the springs and ball bearings inside.
This would effectively double the lifespan of the flywheel.
It would make sense to disassemble the flywheel, resurface the friction surface, then reassemble with new internals.
This would be worth $200.00.
Drifting
Joined: Feb 2004
Posts: 1,485
Likes: 2
From: Champaign, IL
St. Jude Donor '05
I talked to the guys at my local shop and they have resurfaced the dual mass flywheels by spot welding them before surfacing them then grinding off the spotwelds afterwards. They have had success doing this I just wanted a Fidanza due to the weight saving = rwhp theory. 
This is on my to-do list for the winter! 
Race Director
Joined: Feb 2003
Posts: 11,671
Likes: 20
From: Lake Wylie SC
Originally Posted by GMJim
Strick
Use Redline MTL fluid. Better shifting quieter operation and easier on those ZF synchros.
Jim
Use Redline MTL fluid. Better shifting quieter operation and easier on those ZF synchros.
Jim
Drifting
Joined: Jul 2003
Posts: 1,868
Likes: 294
From: West of Burlington, Ontario Canada
It was my understanding that Valeo was a Luk International company. All of them are stamped Luk??? I must confess that I would machine my own flywheel but I usually refrain from recommending it to customers. You never know what they're going to subject them to. However, most of the Corvettes I end up putting flywheels in usually get a Doug Rippie solid flywheel, the original is usually only slightly worn and takes only a light cut to clean them up so I keep them as spares. No complaints about noise with the solid. I really can't see the sense in welding a F body flywheel and cutting it down when the aftermarket now has many new choices. I have done a few diesel trucks with dual mass F/W's that are $2000.00 plus bucks and those guys wish there was an alternative because those are usually junk when they come out. Anyway I hope the dual mass flywheels soon go the way of the DoDo Bird.
Jim.
Jim.
Team Owner
Joined: Aug 2000
Posts: 40,156
Likes: 45
From: San Pedro CA
Perhaps Luk owns Valeo, but according to Bill & ZFDoc, it is all Valeo... every part I have ever bought says "Valeo" on it.
As I said before, the DRM flywheels are just f-body pieces, cut down .090. They are out of stock the last time I checked.
I am afraid that the DMF's are here to stay. The new 350Z has one...
As I said before, the DRM flywheels are just f-body pieces, cut down .090. They are out of stock the last time I checked.
I am afraid that the DMF's are here to stay. The new 350Z has one...
