> I'm
> wondering about vibration and whether that weakens an all
> metal hanger, leading
> to breakage over time.
I'd be more worried about the effect on the exhaust system (and the driver).
The engine actually moves around a fair amount on it's mounts (unless you've
eliminated the rubber in those as well), and mufflers in particular aren't
as strong as you might think.
One alternative is a flexible coupling between the engine and the (first)
muffler, but generally it's a lot cheaper and easier to just use soft mounts
for the exhaust.
-- Randall
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