|Simplified pressure-volume curve for the Scuderi Engine. Source: Scuderi Group. Click to enlarge.|
Scuderi Group, LLC has released the first video footage (with sound) of its split-cycle Scuderi Engine prototype running, on its own, in the laboratory test cell. The two-minute video, the first to show the naturally-aspirated one-liter gasoline prototype engine in operation, provides a view of the engine as it undergoes testing, proving the concept of Firing After Top Dead Center.
In September at the Frankfurt show, the Scuderi Group announced that it had proven the concept of Firing After Top Dead Center and that the naturally aspirated, 1-liter prototype was running. Preliminary test results have matched earlier computer simulation projections. (Earlier post.)
|P-V curve for the Scuderi Engine. Source: Scuderi. Click to enlarge.|
Split-cycle engines separate the four strokes of intake, compression, power, and exhaust into two separate but paired cylinders. The first cylinder is used for intake and compression. The compressed air is then transferred through a crossover passage from the compression cylinder into the second cylinder, where combustion and exhaust occur. A split-cycle engine is essentially an air compressor on one side with a combustion chamber on the other.
The Scuderi engine is expected to produce up to 80% fewer toxins than a typical internal combustion engine. The current naturally aspirated gasoline prototype is expected to reach efficiency gains of 5-10% more than any conventional engine on the road today. When fully developed with its turbocharged and Air-Hybrid components, the engine is expected to achieve efficiency levels of 25-50% higher.
The Scuderi Engine. Source: Scuderi. Click to enlarge.