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Derived from aluminum type 6061 with a T6 temper these sawn flywheel blanks are usually acquired from the mill in a variety of thicknesses and diameters from 12.5 to 15 inches. Classified by their diameter and by the ring gear that surrounds them, the most popular flywheel for a Chrysler is produced from a 12 inch blank with a 130-tooth gear.
Aluminum flywheels enjoy wide use in professional drag racing, road racing, and also in street use. Because of their inherent weight saving in comparison with steel, aluminium is the most potent, affordable medium available in flywheel manufacturing.
Casting 10 to 15 pounds of mass from the rotating assembly of a properly geared vehicle has a profound effect on its ability to accelerate and decelerate. It also suppresses wheel spin. These quickened responses are induced by a lower moment of inertia. That is the measure of an object's resistance to changes to its rotation. The lower the moment of inertia the faster the engine responds.
However, the lightness of the flywheel has to be considered in conjunction with the vehicle’s transmission and rear end gear ratios. For example if the gearing is too high (numerically low) and the flywheel too light, the engine may not sustain its momentum and as a result the car could “bog.” But on a properly geared vehicle, that is a vehicle with a low gear (numerically high) that invites the use of a light flywheel, it will fly off the line and launch with distinction. The formula for matching gearing to flywheel weight is usually available from transmission specialists. Chiefly they calculate the drive ratio, the car weight and the available tire traction.