| "coupling turbocharged direct injection with VCR will allow the customization of engine controls to adjust for ethanol concentration." Nissan’s own VCR concept design called for a newly developed multi-link piston/crank mechanism for the adjustment of compression ratio. In 2003, the Japanese original equipment manufacturer applied for a patent on its “Variable Compression Ratio Piston-Crank System,” which, like the others, has yet to gain commercial status.
http://ethanolproducer.com/article.jsp?article_id=3615
Interesting article.
Raj 
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