The Scuderi Engine (see video demonstration below) claims to offer revolutionary improvement in the efficiency of the internal combustion engine. It is certainly an interesting concept (i.e. we await proof) and has sufficient promise to have raised $20,000,000 new venture funding as of January 2009.
The following is an excerpt from CNET News…
Most conventional internal combustion engines operate using the Otto Cycle. The Otto Cycle uses four strokes of a piston–intake, compression, power, and exhaust–that fire in quick succession using two revolutions of the crank shaft to complete the cycle. This process is only 30 percent efficient, which means you get only 30 percent the energy contained in a gallon of gasoline.
In the Scuderi Split-Cycle Engine, the four strokes are divided over two paired cylinders–one intake/compression cylinder and one power/exhaust cylinder. On a conventional engine, the combustion occurs as the piston is going up. But in the Split-Cycle engine, the piston pair fires after top-dead center, and combustion occurs as the pistons comes down, producing more efficient, cleaner combustion with one cylinder pair and compressed air in the other.
Here is the video which rather clearly demonstrates how the engine works…(Click Here)