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The LiquidPiston engine is a pistonless rotary engine that operates on the high-efficiency hybrid cycle.[1] [2] This cycle consists of compressing air (with no fuel) to a very high ratio, as is typical in the Diesel cycle. The air is then isolated in a constant volume chamber. Fuel is injected and allowed to combust fully under constant volume conditions, which is how Otto cycle combustion is modeled. Finally, the combustion products are expanded to atmospheric pressure, utilizing the Atkinson cycle.


  1. ^ Shkolnik N., Shkolnik A. “High Efficiency Hybrid Cycle Engine”, Proceedings of the ASME Internal Combustion Engine Division 2006 Spring Technical Conference.
  2. ^ Nabours, S., Shkolnik, A., Shkolnik, N., Nelms, R., Gnanam, P. “2010 SAE World Congress: High Efficiency Hybrid Cycle Engine”, Society of Automotive Engineers, World Congress, April 2010, Detroit, MI, USA. Paper 2010-01-1110. Archived 2012-02-29 at the Wayback Machine.

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