By the way, I'm glad you went with a sprung hub disc or you'd be doing the job twice! 
Dual Mass FW Question
Team Owner
Joined: Aug 2000
Posts: 40,156
Likes: 45
From: San Pedro CA
this is very interesting.
I am surprised I haven't seen this information before.
To summerize:
1) There is no rubber membrain. I suspect that there are other DMs in other cars/trucks that have had this technology, but in this application, it does not exist.
2) The springs simply wear out. Once they loose their ability to deal, the flywheel will move about and this will cause engine imbalances and noise.
3) They can't be turned due to space issues. If the flywheel gets too thin, then the pressure plate gets too close to the engine. To overcome this (at least with SMFW), an adjustable pivot ball will solve this.
I feel like a total idiot, to be honest... passing misinformation around.
I will update the FAQ, too.
I am surprised I haven't seen this information before.
To summerize:
1) There is no rubber membrain. I suspect that there are other DMs in other cars/trucks that have had this technology, but in this application, it does not exist.
2) The springs simply wear out. Once they loose their ability to deal, the flywheel will move about and this will cause engine imbalances and noise.
3) They can't be turned due to space issues. If the flywheel gets too thin, then the pressure plate gets too close to the engine. To overcome this (at least with SMFW), an adjustable pivot ball will solve this.
I feel like a total idiot, to be honest... passing misinformation around.
I will update the FAQ, too.
Pro
Joined: May 2005
Posts: 525
Likes: 0
From: San Antonio TX
Originally Posted by bogus
this is very interesting.
I am surprised I haven't seen this information before.
To summerize:
1) There is no rubber membrain. I suspect that there are other DMs in other cars/trucks that have had this technology, but in this application, it does not exist.
2) The springs simply wear out. Once they loose their ability to deal, the flywheel will move about and this will cause engine imbalances and noise.
3) They can't be turned due to space issues. If the flywheel gets too thin, then the pressure plate gets too close to the engine. To overcome this (at least with SMFW), an adjustable pivot ball will solve this.
I feel like a total idiot, to be honest... passing misinformation around.
I will update the FAQ, too.
I am surprised I haven't seen this information before.
To summerize:
1) There is no rubber membrain. I suspect that there are other DMs in other cars/trucks that have had this technology, but in this application, it does not exist.
2) The springs simply wear out. Once they loose their ability to deal, the flywheel will move about and this will cause engine imbalances and noise.
3) They can't be turned due to space issues. If the flywheel gets too thin, then the pressure plate gets too close to the engine. To overcome this (at least with SMFW), an adjustable pivot ball will solve this.
I feel like a total idiot, to be honest... passing misinformation around.
I will update the FAQ, too.
Advanced
Joined: Aug 2002
Posts: 99
Likes: 0
From: Lake Jackson TX
I just put a 383 together with a custom crane cam (close to GM 847 specs). The DM was toast so I went with the Street Twin.
Which the clutch out the tranny is extremely loud. So loud that at redlights cars next to me and behind me will give the car a strange look if their windows are down. I can even hear the ZF clanking away during low RPM acceleration.
It sounds like heavy rocks banging around in a can.
If you can live with the noise and want a tight racing clutch then go with the SM Street Twin setup. The drivability takes awhile to get used to. The clutch wants to grab so the car will shudder when taking off from a stop. If I slip it more (not excessively though) then you can smell the clutch during normal driving (my old centerforce would not smell with this technique).
The car has developed a lot of wheel hop between shifts because of the stronger clutch.
I strongly suggest you listen to one before you jump in with both feet.
Which the clutch out the tranny is extremely loud. So loud that at redlights cars next to me and behind me will give the car a strange look if their windows are down. I can even hear the ZF clanking away during low RPM acceleration.
It sounds like heavy rocks banging around in a can.
If you can live with the noise and want a tight racing clutch then go with the SM Street Twin setup. The drivability takes awhile to get used to. The clutch wants to grab so the car will shudder when taking off from a stop. If I slip it more (not excessively though) then you can smell the clutch during normal driving (my old centerforce would not smell with this technique).
The car has developed a lot of wheel hop between shifts because of the stronger clutch.
I strongly suggest you listen to one before you jump in with both feet.
Advanced
Joined: Apr 2005
Posts: 66
Likes: 0
From: Walcott ND
I just put a SM flywheel out of a camaro in my 93 and love it. I used a Spec stage 3 sprung clutch disk for a camaro and a stock corvette pressure plate. I got my flywheel used off ebay for $50 and had it machined .090 $80, clutch disk was $200 from LMPerformance. The stock pressure plate I got off ebay as well with a stock disk for $85 which I'm going to be getting rid of soon here as long as my setup keeps working as well as it is now. Going used on the flywheel saved quite a bit, but since it's gonna have .090 shaved off it anyway it doesn't really matter. I also didn't get mine match balanced but have no vibration, just lucky I guess.
Thread Starter
Instructor
Joined: Nov 2000
Posts: 171
Likes: 0
From: Huntsville, AL
Here is the set-up I got in today: LT4 PP, SM flywheel and a Mcleod (261871)sprung disk. I started to do a unsprung clutch, since I'm running one in my SS and love it (Spec IV). After I get thing plugged in, I'll write some feed back..
Later,
DJ
Later,
DJ
Team Owner
Joined: Aug 2000
Posts: 40,156
Likes: 45
From: San Pedro CA
Originally Posted by TBH94
Hey Bogus,
Don't beat yourself up over a mistake. You have been more than helpful for many other problems. Your honesty is always appreciated in this forum.
Don't beat yourself up over a mistake. You have been more than helpful for many other problems. Your honesty is always appreciated in this forum.
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