X MINI
SPARK-IGNITED | MULTI-FUEL
70 CC ENGINE PROTOTYPE

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

Download X Mini Brochure with Specifications

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.

When X Mini fully matures the engine is expected to weigh 3 pounds, produce over 5 horsepower at up to 15,000 RPM, and be over 30 percent smaller and lighter than comparable four-stroke piston engines.

The X Mini will enable many small engine applications to be smaller, lighter, and quieter, including:

The engine’s improved noise, vibration and harshness (NVH) characteristics will also increase product performance, enhance operator comfort and prolong application life.

PROTOTYPE DEMO VIDEO

This video shows an early X Mini prototype running, in a speed sweep from 1000 to 6,000 RPM.

COMBUSTION DEMO VIDEO – X MINI 70CC GASOLINE POWERED PROTOTYPE

This high speed video taken at 20,000 frames per second shows the combustion happening inside a LiquidPiston X Mini engine prototype. The engine cover was replaced with a special quartz cover in order to take the video. A spark plug is blocking part of the combustion chamber, but the remainder of the chamber is visible as the rotor expands, and it is clear how the spark-ignited flame propagates in this chamber.

LIQUIDPISTON X MINI 70CC SI ENGINE ANIMATION

This engine is the size of a grapefruit, weighs 4 pounds, and produces 3+ HP! This video shows the internals of the engine, demonstrates the gas flow and implementation of the SI version of the High Efficiency Hybrid Cycle (HEHC)

LIQUIDPISTON X-MINI POWERED GO-KART

This video shows LiquidPiston’s novel 3-chambered rotary engine powering a small vehicle demonstrator (go-kart). This marks the first time an engine has been run outside of the lab, and is a big milestone for the company, as this engine required integrated cooling and control systems.