Inventors:
Frank Keoppel - Ogden UT 84404
International Classification:
F02M 3510
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. Further, a modified piston having a lower oil ring precludes oil from being pushed by pressurized air from leaving the crankcase, squeezing past the piston, and reaching the transfer port and the exhaust port.