Variable Compression - Nissan VC-T
Nissan revolution : could new petrol engine make diesel obsolete ?
The world's first Variable compression ratio engine could kill diesel forever
The ingenuity of VC-T engine technology lies in its ability to transform itself and seamlessly raise or lower the height the pistons reach. As a consequence, the displacement of the engine changes and the compression ratio can vary anywhere between 8:1 (for high performance) and 14:1 (for high efficiency). The sophisticated engine control logic automatically applies the optimum ratio, depending on what the driving situation demands.
http://jalopnik.com/worlds-first-variable-compression-ratio-engine-could-ki-1785295848
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