sentences:  The SR50 DITECH uses the Synerject gasoline direct injection (GDI) system developed jointly by the Orbital Corporation and Siemens AG.The system uses a crank-driven air compressor to deliver air to the cylinder head at a pressure of , thereby avoiding the use of carburation; the cylinder walls are not wet with gasoline, only with lubricating oil.After the port is closed and the air is compressed by the piston, gasoline is injected by an atomizer like a spray nozzle mixed with and propelled by the highly compressed air, into the main combustion chamber where, after the injection port closes, and the piston is still rising, it is ignited in the compressed main charge of air.