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Originally Posted by insite
FYI, i was using the LWFW with a spring centered clutch. i'm pretty sure it wasn't a fractured crank, but i haven't opened the motor yet. the engine had 140k miles on it.
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The material on the magnetic drain plug that you posted a few days ago look like rod bearing material to me.. This can be from a compromised crank that fractured at the radius of a rod journal and toasted that bearing. This is exactly what happened to Lon's engine, when he sent it to me he thought that it had lost a rod bearing, when it arrived I found the broken crank before I even disassembled it. Who knows, only a teardown will prove what the real cause is.
The sprung center disc only helps with harmonics and frequencies that are sent upstream through the input shaft from the drivetrain. The sprung center disc does nothing to aid in the harmonics generated by the engine that cannot be absorbed by the second mass of the flywheel after it has been removed and replaced with a single mass.
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