At the SEMA show last year i was looking at a little race clutch used by "ricers" that make 1000hp in 3000lb cars. It was a billet aluminum diaphram hat and they had sintered iron as well as carbon fibre discs that were wafer thin and about 7" diameter (probably Metric size). The whole setup with a flywheel was lighter than my Soft Lok pressure plate which even has an aluminum pressure ring.
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