2013 Concept Engine Exhaust 
Green Car Congress
MAY 8, 2014
The MkII Clarke-Brayton Engine is a boxer-configuration split-cycle engine implementing what Motiv calls the Clarke-Brayton cycle. Motiv suggests that the MkII engine will be up to twice as efficient as a conventional automobile engine and up to 20% more efficient than modern diesel engines. and O’Malley, E.
Green Car Congress
MAY 9, 2013
High efficiency internal combustion engine. Heat recovery could also be achieved using the Ricardo split cycle engine, a novel internal combustion engine design that incorporates liquid nitrogen to capture exhaust heat and increase fuel efficiency. Compressed air engines (e.g., Compressed air vs. liquid air.
Green Car Congress
OCTOBER 18, 2012
Other features of the X2 include: Quiet operation: engine lacks poppet valves and over-expansion minimizes exhaust noise. By combining HEHC with a rotary engine architecture, LiquidPiston has created an engine that is up to ten times lighter, quiet, and two to three times more efficient at part-load than conventional engines.
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