Extended Expansion Cycle

RadMax® Internal-Combustion Extended Expansion Cycle

Engine manufacturers are working to improve engine efficiency by increasing the expansion-to-expansion ratio (Atkinson-Miller Cycle). The typical way to achieve this in a piston engine is to delay closing the intake value so that the volume of air is compressed less. While this approach improves engine efficiency, it also reduces maximum horsepower and subsequently de-rates the engine.

Unlike other engine technologies, a larger expansion than compression volume is easily possible in a RadMax internal-combustion engine, which can result in increased engine efficiency of 10-15% over comparable hp piston engines.

RadMax internal-combustion engines are able to accommodate a greater expansion volume (Ve) than compression volume (Vc). This results in more work being extracted from the expanding gases and increased engine efficiency and fuel economy.