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Concept: Honda RD Developing Variable Compression Ratio Engine with Dual Piston Mechanism

Green Car Congress

Engineers from Honda R&D Co., presented a pair of papers at the SAE 2009 World Congress describing the development of a variable compression ratio (VCR) engine enabled by a dual piston mechanism. Combining the high compression ratio with the Atkinson cycle, the engineering team demonstrated a 7.4% Kadota et al.

Honda 150