Grail Engine Technologies Inc.’s new internal-combustion engine, which was designed, developed, and patented by the company, integrates the best characteristics of the traditional two-stroke engine with those of the four-stroke engine. To achieve maximum efficiency, the Grail Cycle engine uses uni-flow scavenging, HCCI, Miller cycle operation, and air cooling of intake valve and piston crown. The result is an emissions-friendly and fuel-efficient direct-injected and multifuel-capable internal-combustion engine suitable for virtually any piston engine application. Preliminary analysis of the Grail engine design flow dynamics using Autodesk Simulation CFD software has produced promising results, claims the company. The evacuation and compression flow dynamics create a violent tornado-like effect as well as a swirl and tumble flow pattern that produces optimal conditions for homogeneous/stoichiometric air-fuel mixture operation (illustrated in image). According to Grail Engine Technologies, no other piston engine in the marketplace is able to produce these distinctive traits.