The split-cycle engine cuts this four-stroke cycle into two parts. It uses 'paired' cylinders, with each cylinder in the pair doing half the work. We first covered the concept a few years back, after Scuderi completed a prototype.
In the first cylinder, air is drawn through an intake valve, where it mixes with fuel injected into the cylinder. As the piston returns, a different valve opens into a special port. The mixture is pushed through, where it's drawn into the second cylinder through another intake valve.
The valve then closes, the mixture is compressed by the second piston, and ignited in the power stroke. As the piston returns again, the mixture exits through the exhaust valve as it would normally.
Emissions are reduced, and Scuderi predicts up to 65 mpg would be possible from a small-capacity unit.