Four stroke engine esp for driving portable equipment

摘要

The combustion products of the engine are discharged through a conventional exhaust valve (12). The inlet system incorporates a first connection (23) which is formed in the cylinder block and is used for the infeed of fuel and lubricating oil. This connection is opened and closed by the piston A second connection (24), which is also formed in the cylinderblock, connects the cylinder via a line (31) to the crankcase. The connection (24) opens when the piston reaches a point near its bottom dead end. The crankcase (14) forms a closed unit together with the cylinder block