Most engines these days are mounted transversely. In these instances it is necessary to use a roll restrictor in addition to the engine mounts in order to cushion the impact of the torque. When engine load is transferred the engine can adopt a rolling movement and the torque restrictor limits this movement. As a secondary but equally important function they help to isolate the vehicle occupants from vibration caused by the acceleration, deceleration and idling of the engine.
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