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Old 12-24-2012, 03:20 PM   #2 (permalink)
gone-ot
...beats walking...
 
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Variable Compression is ALREADY available by using a turbocharger, with the realtime adjustment of the "effective" compression-ratio occurring via computer-controlled dump-value!

It's a mechanically external "huff & puff" operation that 'recovers' some free energy from the exhaust...unlike complex, internal, VVT mechanisms which eat energy.
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