LiquidPiston unveils 40-bhp X2 rotary engine with 75 percent thermal efficiency

LiquidPiston’s approach to the problem was to go back to the basics of thermodynamics and work forward to develop what Shkolnik calls the “High Efficiency Hybrid Cycle” (HEHC), which combines the features of the Otto, Diesel, Rankine, and Atkinson cycles.

via LiquidPiston unveils 40-bhp X2 rotary engine with 75 percent thermal efficiency.