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Lightening a standard cast iron flywheel is a risk and is not something I would do personally. If done correctly however it can be safe but due to the much lower tensile strength, lightening should be considered carefully.


Since the JUN flywheel is made from high strength steel already, the benefit of a shrunk on steel ring will have little effect. For a cast flywheel, this may add some additional pre stress to the flywheel, but judging by the dimensions of the ring I would question the magnitude and would not use this as a contingency factor when lightening a cost iron flywheel.


One could state that a flywheel will fail when the tensile strength of the material is exceeded, but a failure could also be down to fracture mechanics. Things can work for a period of time and seem ok, then suddenly fail.


Generally if you stick with large radii and don't go too mental you should be ok. The general rule of thumb on a cast flywheel is to limit yourself to a minimum thickness of 10mm. I personally have no qualms about spending out on a steel flywheel. I have one and the piece of mind is worth it to me, especially when the passenger compartment is in the firing line ;)


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