Modified cycle two-stroke engine

A cylinder for an engine;

• comprising:
• a peripheral wall defining an interior space;
• a piston configured to move in said interior space in a first direction in an exhaust stroke and in a second, opposite direction in a power stroke in which air and fuel in said interior space is ignited;
• two intake conduits leading to said interior space;
• a respective intake valve associated with each of said intake conduits and regulating flow of air from said intake conduit into said interior space;
• an exhaust conduit having an opening in said peripheral wall at a location between lowermost and uppermost positions of said piston;
• and
• an exhaust valve associated with said exhaust conduit,
• whereby in an exhaust-intake stroke after the power stroke when said piston has moved such that an upper surface of said piston is below said opening and said opening is in flow communication with said interior space, said exhaust valve is in an open state and air is inlet into said interior space through said intake conduits and forces combustion products to exhaust said interior space through said exhaust valve into said exhaust conduit, and fuel is inlet into said interior space using a fuel injector.

An apparatus for providing a source of compressed air for a two-stroke engine having at least one engine cylinder and an engine crankshaft, comprising:

• a rotatable compressor crankshaft;
• a compressor cylinder defining an interior space and including a surface defining said interior space having a first aperture and a second aperture;
• a first valve at least partly in said first aperture;
• a second valve at least partly in said second aperture;
• a piston compressor configured to move in said interior space of said compressor cylinder upon rotation of said compressor crankshaft;
• a compressor intake conduit leading from ambient environment to said first aperture;
• an air tank;
• a compressor outlet conduit leading from said second aperture to said air tank;
• an engine intake conduit system leading from said air tank to an interior space of the at least one engine cylinder of the engine;
• and
• interconnection structure that interconnects said compressor crankshaft to the engine crankshaft such that rotation of the engine crankshaft causes rotation of said compressor crankshaft,
• whereby rotation of said compressor crankshaft causes movement of said piston compressor in said interior space of said compressor cylinder and compression of air inlet into said interior space through said compressor intake conduit and said first valve and outflow of compressed air through said compressor outlet conduit and said second valve to said air tank.