| 摘要 |
An internal combustion engine comprising at least one pair of pistons (20, 2 1) rotating, oscillating or reciprocating in cylinder assemblies (11, 12) joine d by a crankcase (13), each piston (20, 21) being driven by a crankshaft house d in the crankcase (13), the crankcase (13) including an inlet port (63) for entry of an air fuel mixture and an outlet port (65) for transfer of compressed air fuel mixture, each cylinder (11, 12) having a combustion chamber (35) and at least one inlet (36) and at least one exhaust (36) valve port communicating with the combustion chamber (35), the inlet valve port (3 6) being in communication with the crankcase (13) via the crankcase outlet port (65) whereby the engine is adapted to run on a four stroke cycle with the underside of the piston (20, 21) pressurising the air fuel mixture in the crankcase (13) and causing transfer of the pressurised air fuel mixture to t he combustion chamber (35) via the crankcase outlet port (65) and inlet valve port (36).
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