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Achates Power continues development of opposed-piston technology for US Army vehicles

Green Car Congress

The family of engines strategy uses a common power cylinder system across several different engine variants to address a range of power and torque requirements in order to serve multiple military vehicles with a common architecture. The variable flow lube pump helps maintain engine efficiency.

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LiquidPiston introduces latest X-series version of HEHC rotary engine; targeting 58% peak BTE, 2 hp/lb power density

Green Car Congress

Other features of the X2 include: Quiet operation: engine lacks poppet valves and over-expansion minimizes exhaust noise. Low heat signature from over-expansion and cycle skipping eliminates water cooling. Internal cooling with air or water (Rankine). Power modulation by cycle skipping increases efficiency and recaptures heat.

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Bladon Jets, SR Drives and Jaguar Land Rover Win Funding for Gas Turbine Electric Vehicle Project

Green Car Congress

Oil-less carbon-air bearing system. Bladon suggests that in an hybrid vehicle application, with no water-cooling system, oil or catalytic converter, the Micro-Jet engine can provide vehicle weight savings of up to 15%—with a consequent reduction in fuel consumption and carbon emissions—compared to a piston engine.