Here's what Modern Drivelines says about Aluminum flywheels...
<quote> Aluminum flywheels were designed to lessen the rotating mass of the motor allowing the motor to spin up faster. A good application for this is road racing or auto-crossing. Aluminum flywheels don't present any issues on the street. However, the engine pulsations may be more prevalent as they are not dampened by the heavier steel flywheel. There is a steel facing that can be replaced once is it worn out. <end quote>
I disagree with them about the "street".... having owned more than a couple drag cars.... which used aluminum flywheels way back when.... but they were radical as well and a little tough to drive on the street anyway. But in a heavy street car - that flywheel mass or lack thereof will definitely be felt/noticed.
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