Abstract: A four-stroke engine with intake air compression chamber. The intake air compression chamber has a pressure responsive displaceable member therein to compress inlet air passively in response to differential pressure between a sealed crankcase and air in the inlet side of the inlet air compression chamber. The displaceable member is substantially impervious to air, oil, and fuel. When the piston moves away from the intake air compression chamber, decreasing pressure draws the displaceable member toward the crankcase, and the movement of the displaceable member draws into the intake side of the inlet air compression chamber through a one way inlet valve. When the piston moves toward the inlet air compression chamber, fluidwise, compressed gas in the crankcase causes increased pressure on the displaceable member, compressing the inlet air, and directing compressed inlet air out through a one-way outlet valve.

Abstract: A four-stroke engine with intake air compression chamber. The intake air compression chamber has a pressure responsive displaceable member therein to compress inlet air passively in response to differential pressure between a sealed crankcase and air in the inlet side of the inlet air compression chamber. The displaceable member is substantially impervious to air, oil, and fuel. When the piston moves away from the intake air compression chamber, decreasing pressure draws the displaceable member toward the crankcase, and the movement of the displaceable member draws into the intake side of the inlet air compression chamber through a one way inlet valve. When the piston moves toward the inlet air compression chamber, fluidwise, compressed gas in the crankcase causes increased pressure on the displaceable member, compressing the inlet air, and directing compressed inlet air out through a one-way outlet valve.

Abstract: A four-stroke engine with an isolation chamber. The isolation chamber has a pressure-sensitive wall attached to or slidably mounted within the isolation chamber. The pressure-sensitive wall is substantially impervious to air, oil, and fuel. When the piston moves away from the crankcase, a vacuum is created in the crankcase. This draws the pressure-sensitive wall toward the crankcase, fluidwise, and movement of the pressure sensitive wall pulls air into the intake side of the isolation chamber through a one-way valve or time induction mechanism. When the piston moves toward the crankcase, increased pressure within the crankcase forces the pressure-sensitive wall away, fluidwise, from the crankcase and pushes air from the isolation chamber into the combustion chamber. The pressure-sensitive wall prevents oil from flowing from the crankcase. Power in a four-stroke engine is increased up to as much as 40%, without the necessity to employ superchargers or turbochargers.

Abstract: A two-stroke engine with an isolation chamber. The isolation chamber has a pressure-sensitive wall attached to or slidably mounted within the isolation chamber. The pressure-sensitive wall is substantially impervious to air, oil, and the fuels used in an internal combustion two-stroke engine. When the piston of the engine moves away from the crankcase, a vacuum is created in the crankcase. This draws the pressure-sensitive wall toward the crankcase within the fluid communication circuit, which movement of the pressure sensitive wall also pulls air into the intake side of the isolation chamber through a one-way valve or time induction mechanism. When the piston moves toward the crankcase, the increased pressure within the crankcase forces the pressure-sensitive wall away, fluidwise, from the crankcase and thus pushing air from the isolation chamber into the combustion chamber. The pressure-sensitive wall therefore is effective in preventing oil from flowing into the combustion chamber from the crankcase.