If the bolt came loose, all that's keeping the pulley locked to the crank is that little keyway. It definitely looks like it slipped and sheared the keyway.
My guess is bolt loosened, pulley sheared the keyway. Lots of people run your blower set up, and unless it doesn't get posted here, I can't remember anyone breaking a snout, yet alone with this set up at these power levels?
My guess is bolt loosened, pulley sheared the keyway. Lots of people run your blower set up, and unless it doesn't get posted here, I can't remember anyone breaking a snout, yet alone with this set up at these power levels?
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