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Reply to "Maui garage find Intermeccanica rebuild"

Panhandle Bob posted:

Would damage to the fan blades be from stuff getting sucked into the shroud or is there something else, like bearings wearing out that would cause that?

I don't think it has to do with anything like that, Bob; it's my understanding that even a new stock fan in perfect shape will come apart after being subjected to enough higher rpm bursts. There doesn't seem to be a set number- rev the engine significantly higher than stock often enough and it will come apart. Some last longer than others, but it's enough of a certainty that you can count on it happening eventually.

The good elves at Wolfsburg never envisioned engines running at more than 4500 rpm, and to be honest I don't think I've ever heard of a fan coming apart on a stock carbureted engine. Remember, we're taking properly engineered parts that almost never fail when run within their original operating parameters and subjecting them to way more stresses than they were ever designed for. IIrc, the common thought is that for a fan to survive above 6,000 rpm with any regularity it needs to have no wear on the center where it fits on the collar (it will round out if the nut that holds it onto the shaft isn't torqued properly) and it needs to welded/balanced.

Mike seems to have got the short end of the stick.

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