Cylinder head for 4 stroke engine - has rotary valve unit with inlet and exhaust ports and spark plugs at specific angular positions, rotating relative to cylinder block to index ports with plugs

摘要

The engine has a rotary valve unit located above (12) the cylinder head. The valve unit has cylindrical rotor (1) that has three exhaust channels (7a,7b,7c) located radially, connecting with a centre duct (21). Located at specific angular positions are spark plugs (10a,10b) and their positions are set relative to inlet ports (6a,6b,6c) and the exhaust ports. The rotor is indexed to connect inlet, exhaust and plugs with a fixed channel (8) in turn, that connects to the piston chamber of the cylinder block. ADVANTAGE - High performance, simplified valve mechanism.