dual mass flywheel
Le Mans Master
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From: Life is just one big track event. Everything before and after is prep and warm-up and cool-down laps
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St. Jude Donor '12
IIRC its two masses with springs keeping them in line and a rubber compund that keeps them together and can stretch.
Also made of unobtanium - very hard to find.
Also made of unobtanium - very hard to find.
Le Mans Master
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From: Australia
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From: Overland Park Kansas
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Good links to what a DMF is. The reason it's in our Corvettes has to do with GM's search for a viable 6-speed stick to put in the ZR1.
I don't remember the exact story, but they had to use the German-built ZF6 as the only 6-spd platform available (at the time) that would handle the necessary power (and more). Because of the geometry of bearings/gears INSIDE the ZF6, rattling/noises are present w/o the use of a dual-mass flywheel.
So, GM opted to use one in order to address/prevent objections they expected -- had they used a SMF.
I don't remember the exact story, but they had to use the German-built ZF6 as the only 6-spd platform available (at the time) that would handle the necessary power (and more). Because of the geometry of bearings/gears INSIDE the ZF6, rattling/noises are present w/o the use of a dual-mass flywheel.
So, GM opted to use one in order to address/prevent objections they expected -- had they used a SMF.
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Michael S. Palmer
Race Director
Joined: Nov 2003
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From: Overland Park Kansas
2020 Corvette of the Year Finalist (appearance mods)
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This has been an editorial comment. But, it does not necessarily express the views of management! 
Seriously, if you do convert to a SMF, make sure to use a sprung hub clutch. There's at least one guy here who didn't. He's in the process of converting to an automatic because of his disappointment in the ZF6. Says he got tired of shifting in traffic -- but the writing's on the wall IMO.
FWIW: Carolina clutch says the heavier steel SMF provides a more drivable option. The momentum of that extra weight helps aide/ease clutch engagement w/o killing the motor.
There's advantages to each option though. Lighter rotating mass makes for a faster revving motor. The momentum of a heavier mass keeps the motor running (rotating) while letting the clutch out.
Seriously, if you do convert to a SMF, make sure to use a sprung hub clutch. There's at least one guy here who didn't. He's in the process of converting to an automatic because of his disappointment in the ZF6. Says he got tired of shifting in traffic -- but the writing's on the wall IMO.
FWIW: Carolina clutch says the heavier steel SMF provides a more drivable option. The momentum of that extra weight helps aide/ease clutch engagement w/o killing the motor.
There's advantages to each option though. Lighter rotating mass makes for a faster revving motor. The momentum of a heavier mass keeps the motor running (rotating) while letting the clutch out.
Last edited by GREGGPENN; Feb 4, 2010 at 09:45 PM.
