Experts in thermodynamics have long known that the ideal heat engine cycle is "adiabatic", meaning that the stroke occurs without gain or loss of heat and without a change in entropy. This means that during the process of expansion and decompression, all the energy within the given temperature bracket is given out as power or returned to the closed system.

The Soony will be the most efficient engine on the planet. The optimum efficiency is achieved because the patented Soony design utilizes its full Carnot bracket (usable heat energy) with the same adiabatic efficiency as turbines – the most widely used Combined Heat to Power (CHP) engines for waste heat recuperation. Generally, turbine engines utilize a 2200ºF to 1200ºF heat range, but the Soony utilizes its full Carnot bracket down to an ambient temperature of 70ºF.

Turbines operate at ~35% efficiency and require expensive co-generators to capture the remaining lower temperature range to increae efficiency. Stirlings are the state–of–the–art in heat engines, and the beauty of the isothermal Kockums Stirling is that it utilizes its full Carnot potential from 1230º to ambient 70ºF. However, the Kockums is a Stirling and can only convert ~70% of it's 68.5% potential, with an overall engine efficiency of 41% including mechanical losses. The patented Soony engine will be 51% efficient including mechanical losses.