LiquidPiston is currently developing and testing the X Mini, a power-dense, low-vibration, quiet, 70 cc gasoline powered rotary four-stroke engine prototype. The compact engine (4-pound core) has only two primary moving parts.

LiquidPiston’s X Mini is powered by the company’s patented High-Efficiency Hybrid Cycle (HEHC), an improved thermodynamic cycle optimized for fuel efficiency and provides low-noise benefits. The system has been demonstrated operating at 3.5 horsepower (net indicated) / 2.1 horsepower (brake) at 10,000 RPM. The X Mini has the ability to run for 40 minutes at a time and for three hours cumulatively. These demonstrations of the gasoline-powered X Mini proves that LiquidPiston’s innovative engine technology can scale down in size and is multi-fuel capable.