Scuderi Group, LLC will announce next week at the Frankfurt Motor Show that it has proven the concept of Firing After Top Dead Center. A working, cutaway model of the prototype split-cycle engine will be on display in Frankfurt. Scuderi introduced the proof-of-concept prototype for its Scuderi Split-Cycle Engine (earlier post) at the SAE World Congress in Detroit in April. (Earlier post.)
The naturally aspirated, one-liter prototype is currently running and undergoing testing at SwRI where preliminary test results have matched earlier computer simulation projections. Further testing will occur over the next several weeks as engineers continue to fine tune and adjust the prototype. Engine maps and other data are currently being made available to OEMs on a non-disclosure basis.
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. And when fully developed with its turbocharged and Air-Hybrid components, the engine is expected to achieve efficiency levels of 25-50% higher.
Preliminary test results are very encouraging. The pressure curves produced from the combustion process of firing after top dead center are showing excellent results and torque levels remain very strong.—Sal Scuderi, president, Scuderi Group
The Scuderi Cycle is a split-cycle design that divides the four strokes of a conventional combustion cycle over two paired cylinders: one intake/compression cylinder and one power/exhaust cylinder. By firing after top-dead center, it produces efficient, cleaner combustion with one cylinder and compressed air in the other. Unlike conventional engines that require two crankshaft revolutions to complete a single combustion cycle, the Scuderi Engine requires just one. Besides the improvements in efficiency and emissions, studies show that the Scuderi Cycle is capable of producing more torque than conventional gasoline and diesel engines.
With the naturally aspirated engine prototype now running, Scuderi Group and its independent laboratory continue to work on the next prototypes. Completion of the turbocharged Scuderi Engine and the Scuderi Air-Hybrid are expected in 2010.