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The continuous research for better performance and reduction of fuel consumption demanded the development of analytical techniques to better understand the rattle mechanism, with complex non-linear models being widely used for simulation. In regards to the fuel, the “flexible” engines, which can work with any mixture of gasoline/ethanol, are already a reality in the Brazilian market. These flex-fueled vehicles present higher values of irregularity, creating a specific scenario for this market. Several models with static approach of the clutch damper can be found in the available literature with limited measured data, which makes life difficult to validate or correlate these models. For this reason, the analytical formulation of dynamic clutch dampers developed high importance for solving and/or reducing clearance-induced vibro-impact problems which leads to rattle noise.