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Old 07-27-2009, 12:04 PM   #2 (permalink)
Master EcoModder
Join Date: Mar 2009
Location: Northeast Ohio
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The Wife's Hot Rod - '09 Pontiac G8 GT
Last 3: 23.22 mpg (US)

Big Outback - '13 Subaru Outback 2.5i

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I'm thinking they work like very large harmonic balancer. My guess to the efficiency increase comes from absorbing the energy in a spring which is able to return it to the drive line. In a harmonic balancer the energy is absorbed by a hydraulic system or an elastomer damper.

I am guessing due to their cyclic working, the springs fatigue & break. Causing possible damage to the housings. It's like having to have your clutch replaced with expensive parts & lots of labor. Someone wrote that it cost him 1500 pounds-sterling, approx $2500, to have it replaced. Which makes a $900 clutch job look cheap.

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