How a Dual Mass Flywheel Works

In a vehicle with a standard transmission, a dual mass flywheel will reduce rattling when the transmission shifts gears. As well, you will be able to shift gears more smoothly with less force. These 2 factors can increase your fuel economy by helping your entire drive train operate more smoothly, and idle at lower RPM (revolutions per minute). Learn here about how a dual mass flywheel works in a car or truck.

What Is a Dual Mass Flywheel?

A dual mass flywheel is a 2-part geared flywheel. It is made up of a main and secondary wheel and a set of torsion springs. A friction ring that absorbs torsional vibration is located between the flywheels. The friction ring allows the main and secondary flywheels to slip past each other when the transmission shifter is between gears, reducing vibration during shifting. Damper springs between the flywheel and other parts of the drive train absorb shocks, reducing transmission wear.

The Dual Mass Flywheel in Action

When you start the vehicle the dual mass flywheel works to absorb vibration as energy travels outward from the engine to the transmission. When you turn off the engine, the dual mass flywheel also absorbs the energy released as the drive train parts slow down and stop moving.