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Toyota has patented a variable length connecting rod that would allow the company to switch between two compression ratios for maximizing efficiency.
Variable-Compression Engines Are Now a Thing, But They're Far From a New Idea
Processes, Free Full-Text
GM Files To Patent Variable Compression Combustion Tech
Low-load expander deactivation studies for a light-duty single-shaft piston-compounded engine - Peter Andruskiewicz, Russell Durrett, Paul Najt, 2021
US7210397B2 - Scotch yoke engine - Google Patents
Variable Compression Engine
What is the main reason hybrid electric vehicles are more fuel efficient than other vehicles? - Quora
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Toyota Variable Compression Engine Patent Shows ICE Not Dead Yet
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PRI 2013: Ford Shows Off Its Ecoboost Crate Engine
Has the internal combustion engine in cars reached its peak? - Quora