Abstract: A multi-step engine air intake volume control device having a first electromagnetic valve connected between an air input port and a manifold pipe in a positive crankcase ventilating system of a motor vehicle and controlled by a control circuit to let fresh air be drawn into the engine of the motor vehicle subject to the revolving speed of the engine, wherein a container is mounted inside the motor vehicle, having a water chamber holding a volume of water and an oil chamber holding an oil; a second electromagnetic valve is provided having an input end connected to the water chamber and oil chamber of the container by a guide tube and three-way pipe connector assembly and an output end connected to the manifold pipe, the second electromagnetic valve being controlled by the control circuit to open the passage between the container and the manifold pipe for permitting water and oil mixture to be drawn from the container into the manifold pipe when air is guided by the manifold pipe into the engine of the motor ve

Abstract: A multi-step engine intake air volume control device including a casing having an air input port and an air output port, an air filter element to filter air passing from the air input port to the air output port, a plurality of guide tubes respectively connected to the air output port of the casing, a plurality of electromagnetic valves controlled to open/close the guide tubes respectively, a manifold pipe installed in the positive crankcase ventilating system of the motor vehicle to guide air from the guide tubes into the engine of the motor vehicle, and a control circuit connected to the speedometer of the motor vehicle and controlled to alternatively close/open the electromagnetic valves subject to the revolving speed of the engine.