Mechanical direct cylinder fuel injection

An engine comprising:

• a two-stroke internal combustion engine having a cylinder and a cylinder head;
• an engine piston slidably received for linear reciprocation within the cylinder and defining a combustion chamber with the cylinder and head, each engine cylinder and piston defining in part an air chamber opposite the combustion chamber side of each engine piston and its engine cylinder, a transfer passage in communication with the air chamber and selectively communicated with the combustion chamber to supply additional combustion air to the combustion chamber;
• a spark plug communicating with the combustion chamber;
• a crankshaft operably connected with the piston and powered to rotate in one direction by reciprocation of the piston;
• a compressor having a compressor piston slidably received in a secondary cylinder and defining in part a compression chamber adjacent one side of the compressor piston and a crankcase chamber adjacent its opposite side, an inlet to the crankcase chamber to receive a rich fuel and air mixture and an outlet from the compression chamber to deliver the rich fuel and air mixture under a pressure of at least 30 PSI to the engine cylinder;
• a carburetor having an outlet in communication with the inlet of the compressor to supply a rich fuel and air mixture to the compressor having a fuel to air ratio in the range of 1:2 to 1:12.5;
• a transfer passage formed in the secondary cylinder so that movement of the compressor piston tending to decrease the volume of the crankcase chamber causes the rich fuel and air mixture therein to flow through the transfer passage and into the compression chamber;
• a valve in the engine head and communicating the outlet of the compressor with the interior of the engine cylinder, a spring yieldably biasing the valve to a closed position and the valve opening against the bias of the spring and in response to a pressure differential across the valve to admit a compressed rich fuel and air mixture into the engine cylinder, said engine cylinder communicating with said compressor outlet only through said valve;
• and
• a transmission member operably connecting the compressor with the crankshaft to drive the compressor piston in timed relation to the engine piston to compress and deliver the rich fuel and air mixture from the carburetor to the combustion chamber of the engine cylinder where it is ignited by the spark plug to power the engine.