| 摘要 |
An improved two stroke cycle engine is disclosed. The engine has an intake port for passing air into a cylinder of the engine and has a piston within the cylinder for reciprocal movement between a top dead center position and a bottom dead center position. The engine includes a crankcase, an intake valve in a wall of the crankcase, a plenum chamber for supplying air to the intake port and an output valve positioned between the crankcase and the plenum chamber. The engine also includes an air compressor and an air compressor valve positioned between the air compressor and the plenum chamber. The engine has a first mode of operation during startup wherein the piston draws air into the crankcase through the intake valve and then forces air from the crankcase, through the output valve, into the plenum chamber and to the intake port. The engine has a second mode of operation during which the engine is running wherein the air compressor forces air through the air compressor valve, into the plenum chamber and to the intake port. A two stroke cycle engine having a plurality of cylinders, cylinder heads and the upper portion of the crankcase formed from the same material is also disclosed. Other kits and methods of practicing the invention are also disclosed.
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