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Originally Posted by wellis77
The comment about billet flywheel's, are these aluminum or steel? I can get a chromoly or billet aluminum flywheel for my application. Which one would be the better way to go? I'm checking if either are SFI rated. Thanks.
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Billet means it is machined from raw stock as delivered from the mill. The part is machined from this chunk of metal into the part. Alternatively, a part is cast into the design and then finished machined into tolerance. It's the process not the material really. So you can have billet steel or billet aluminum.
As for aluminum or not flywheels I can only speak from experience with my car. I put an aluminum flywheel in my formula. It revved more easily and would respond well after already moving. From a stop, the cast steel flywheel hit harder and would get the car up and moving more quickly. The cast flywheel had more inertia to transfer to the rear wheels and get the car moving from a stop. I didn't regret putting the Fidanza flywheel in the car even though I would randomly stall out at a stop light after many thousands of miles of driving the car. However, if I were to do it again, I'd go billet steel. Lighter than cast, heavier than aluminum, and stronger than both.