Abstract
Traditional two stroke engines suffer of low peak efficiency, dramatic reductions of efficiency changing the load or the speed, high emissions of regulated pollutants plus burned oil, inefficient lubrication. All these downfalls are addressed in a novel two stroke engine featuring a mechanism for partial rotation of the piston during its stroke to produce asymmetric port timing. When the piston is moving downwards, the exhaust port opens first, then the intake. However, when the piston moves upwards, it is the exhaust to close first, and then the intake. This permits supercharging scavenging rather than the traditional crankcase scavenging, and it allows traditional pressurised lubrication. Coupled to direct injection and jet ignition this design improves the full and part loads efficiency and reduce emissions. The paper presents the details of the CAD design and results of CAE simulations.
KEYWORDS – environmentally friendly vehicles, two stroke engines, direct injection, jet ignition, asymmetric port timing, super charging, dry sump