In general, the most significant improvements of ICEs could be achieved though their thermodynamic cycles. The improvements below can be implemented only in the thermodynamic cycles of the cam engines as the CoAxial engine. The corresponding benefits affect primarily efficiency and exhaust emissions.
| Ideal / Otto Thermodynamic Cycle | Real thermodynamic Cycle in CoAxila engine | Real thermodynamic Cycle in conventional ICE |
|---|---|---|
| Instantaneous combustion at TDC | Combustion at approximately constant volume | Not possible |
| Instantaneous gas exchange at BDC | Gas exchange at approximately constant volume | Not possible |
| No wall heat transfer (WHT) | Reduced WHT through higher coolant temperature | Higher coolant temperature can cause pistols’ sticking |
| Atkinson effect is no part of the Ideal / Otto cycle | Atkinson effect with equal strokes and short cylinders | Atkinson effect with longer cylinders |
Aggressive valve operation but gentle toward timing mechanism
Atkinson cycle effect achieved – but using equal strokes
