Subsequent to the combustion, the greatly expanded exhaust gas mixture would be quickly forced out of the exhaust valves. Achieving a certain volume flow during the exhaust stroke, the inertia of the exiting gas would leave behind a negative pressure void, in the cylinder, at the end of the exhaust stroke, and therefore opening the intake valves at this point of time will allow the negative pressure to be used to create a vacuum for the fresh air to fill, initiating the intake process and jump-starting the intake flow creation process. Once again, this would aid the engine in drawing more air quicker, again improving the volume of the air charge in the cylinder, improving volumetric efficiency and eventually power output.