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Achates Power developing light-duty two-stroke opposed-piston diesel engine: the OP4

Green Car Congress

The OP4 light-duty opposed-piston diesel. Achates Power, which is developing a family of two-stroke, compression-ignition (CI) opposed-piston (OP) engines, has designed and is developing a light-duty diesel concept engine, the OP4. Achates started with a 1.06L/cylinder engine configuration, then moved up to a 1.6L/cylinder

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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

Isuzu D201 35 hp diesel engine (left) and the LiquidPiston 40 hp X2 Prototype (right). HEHC is an improved thermodynamic cycle optimized for fuel efficiency that combines features of four existing cycles: High air compression ratio (Diesel). HEHC thermodynamic advantages relative to the diesel and the Otto cycles.

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