-> I never saw one come apart,  but I was of the impression that the
-> reason they weren't used in cars was because they were a whole lot
-> more expensive than conventional engines.  Is this not the case?
That's one of the major drawbacks allright.  They'd get a lot cheaper
if the economy of scale of manufacture ever got squared away.  But they
have several operational problems that make them just a tad impractical.
 ^..^
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