Welcome to the Corvette Forums at the Corvette Action Center!

Anyone have a dual mass flywheel for sale?

jay23ls

Member
Joined
Apr 25, 2016
Messages
5
Location
socal
Corvette
1994 Admiral Blue LT1
Hello, first post on this forum! Got pics of my new-to-me C4 below :D

Been researching flywheel stuff since my clutch is getting replaced at a shop (couldn't do it myself right now). Some have said I'll def need a new flywheel, others including Jim from Power Torque Systems says no way to tell w/o looking/testing. So I'm starting the search now in case it cant be cleaned/resurfaced/machined etc.


Also, overall more ppl have advised against going single mass than the ones who favor it. Will do it if I cant locate a DMF or the price for one is very high. Jim btw has a new one but much too costly for me right now.

Please let me know if you have one and how many miles were put on it. Thank you!
 

jay23ls

Member
Joined
Apr 25, 2016
Messages
5
Location
socal
Corvette
1994 Admiral Blue LT1
She's a 94 LTI 6 speed 94k miles :D

20160412_133337.jpg20160412_133420.jpg20160412_133602.jpg20160412_133734.jpg
 

Hib Halverson

Technical Writer for Internet & Print Media
Joined
Jan 10, 2001
Messages
13,453
Location
CenCoast CA
Corvette
71 04 12 19
New dual mass wheels are long-since discontinued by GM. No one in the aftermarket ever offered them.

Good used DM wheels are quite rare.

Faulty DM wheels are common.

Generally dual mass wheels cannot be surfaced by conventional methods, however, there are a few machine shops which can resurface dual-mass wheels and they are usually the guys who resurface the dual mass wheels used in BMWs. Find one of those guys and you may be able to get a DM wheel surfaced.

That said, the secondary mass is also the friction surface for the clutch. When you machine material off that, you decrease it's mass and that degrades its heat sinking ability.

As for putting a standard flywheel in place of a faulty DM wheel, that's what I did on the C4 I owned until just recently. I installed a McLeod aluminum wheel. I had it in the car for 12 years with never a problem. What are the downsides? A modest increase in gear rattle from the transmission. The upsides, the engine rev'ed quicker and had better throttle response.
 

jay23ls

Member
Joined
Apr 25, 2016
Messages
5
Location
socal
Corvette
1994 Admiral Blue LT1
New dual mass wheels are long-since discontinued by GM. No one in the aftermarket ever offered them.

Good used DM wheels are quite rare.

Faulty DM wheels are common.

Generally dual mass wheels cannot be surfaced by conventional methods, however, there are a few machine shops which can resurface dual-mass wheels and they are usually the guys who resurface the dual mass wheels used in BMWs. Find one of those guys and you may be able to get a DM wheel surfaced.

That said, the secondary mass is also the friction surface for the clutch. When you machine material off that, you decrease it's mass and that degrades its heat sinking ability.

As for putting a standard flywheel in place of a faulty DM wheel, that's what I did on the C4 I owned until just recently. I installed a McLeod aluminum wheel. I had it in the car for 12 years with never a problem. What are the downsides? A modest increase in gear rattle from the transmission. The upsides, the engine rev'ed quicker and had better throttle response.


Thanks for the info. Shop said the flywheel is ok and they re-surfaced it. They're a reputable shop that have done C4s before so all should be ok. I'll keep the McLeod in mind for the future!
 

G Winter

Well-known member
Joined
Aug 21, 2004
Messages
2,177
Location
NW Iowa
Corvette
1990 red convert 6 sp
The DM flywheel has bearings and springs in it. There is also some lube in the bearing part and has a seal.I was told the seal on the earlier flywheels was not as good as the later and will leak if debris get to it. This happened to my 90. The clutch was fine when cold but when it got warm would start to slip.What I was told is the lube leaks onto the clutch surface.The seal also can make resurfacing a challenge. These are things I was told but can not verify although the way my clutch acted seems probable.
A sign that the internals of the flywheel are bad is excessive transmission rattle when warm. Mine went out when I could still get a new flywheel, and the rattle went away after installing it .
If you can live with transmission rattle at idle then go with what Hib said.With the cost of replacing a clutch taking a chance on installing a resurfaced flywheel might be like rolling dice.
 
Last edited:

Corvette Forums

Not a member of the Corvette Action Center?  Join now!  It's free!

Help support the Corvette Action Center!

Supporting Vendors

Dealers:

MacMulkin Chevrolet - The Second Largest Corvette Dealer in the Country!

Parts/Accessories:

Vetteskins

Advertise with the Corvette Action Center!

Double Your Chances!

Partners

Top Bottom