While the invention can be used with both spark-ignition (petrol) and compression-ignition (diesel) engines, Dynex says it is also suited to engines operating on gaseous fuels, such as natural gas or LPG. According to the Dynex team, it is desirable to have an extremely small clearance between the moving and stationary components only sufficient to prevent seizing of the components from thermal expansion. The number of grooves, their dimensions and their angle determines the effectiveness of the air sealing. The cross-sectional shape, size and the number of grooves are designed to generate extremely high-speed eddy currents of the air in them to provide effective sealing. In lieu of mechanical piston rings or seals, the invention uses a labyrinth of grooves around the piston which are angled toward the combustion chambers they intend to seal. Young and the Dynex team highlighted that air sealing would not provide a perfect seal, but, according to them, perfect sealing is not required. Compressed air, which is stored and continually replenished, performs the sealing of the induction air and combustion gases in the chamber, cools all mating surfaces, and can power the starter-motor and other ancillary components. The principle of the technology is using so-called ‘air sealing’ in lieu of conventional mechanical metal-to-metal sealing. Additionally, it contributes to a stratified-charge air-fuel mixture for combustion by providing an “after-burn” of exhaust gases. It also eliminates friction between and subsequent wear of these components. Here, the pistons do not touch their mating cylinder bores as the invention eradicates the need for conventional piston rings and lubrication between the pistons/rings and their mating cylinders. Eng., the design dubbed ‘air-sealing technology’ is intended for engines where the pistons locate by bearings or bushes. According to the company’s founder, Colin G Young P. Australian engine development company, Dynex International, has enhanced its engine sealing technology that it believes will contribute significantly to engine efficiency while extending engine life and reducing emissions.
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