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Old 10-19-2009, 02:03 PM   #10 (permalink)
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I don't remember that one, but Saab put together a variable-compression engine where the cylinder head was hinged on one side, and you opened up the hinge for more volume and lower compression. Sounded like a bit of a nightmare keeping everything sealed up, but supposedly it worked. They used it in conjunction with a turbocharger, and varied the compression more or less inversely to the boost.

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