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Matt.... Clutch Question..

What is the difference between Single and Dual Mass?

Thanks.

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63 356 2.1 Rally Coupe
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Old 09-17-2025, 03:14 AM
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A dual mass flywheel is designed to dampen NVH better, at the cost of weight. A single mass flywheel is designed to allow for quicker revving and shifting by reducing the rotating mass.
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Old 09-17-2025, 06:34 AM
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Thanks Matt

What is NVH?
Old 09-17-2025, 12:14 PM
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noise, vibration and harshness
Old 09-17-2025, 12:58 PM
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They dampen the drivetrain, typically using springs sandwiched inside the flywheel. As Matt says, they are heavy MFers.

Old 09-17-2025, 01:04 PM
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Quote:
Originally Posted by Mocker View Post
noise, vibration and harshness
Harmonics.
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1974 914 Bumble Bee
2009 Outback XT
2008 Cayman S shop test Mule
1996 WRX V-limited 450/1000
Old 09-17-2025, 01:43 PM
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Thanks for the education.
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63 356 2.1 Rally Coupe
75 911M 2.7 MFI
86 Sports Purpose Carrera "O4"
19 991.2 S
Old 09-17-2025, 03:23 PM
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Anytime.

From a performance standpoint it’s free horsepower. It’s mass the engine doesn’t have to din. In my experience it also makes it easier to blip for a double clutch rev match downshift.
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1974 914 Bumble Bee
2009 Outback XT
2008 Cayman S shop test Mule
1996 WRX V-limited 450/1000
Old 09-17-2025, 03:57 PM
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Hah. I always heard/read the H was for harshness. Education, indeed.
Old 09-18-2025, 06:11 AM
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All good.

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1974 914 Bumble Bee
2009 Outback XT
2008 Cayman S shop test Mule
1996 WRX V-limited 450/1000
Old 09-18-2025, 08:09 AM
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