Patent ID: 6854430

Claim:
An engine body for a crankcase scavenged two-stroke engine, comprising: a cylinder ( 1 ) with a cylinder bore ( 2 ) that has a longitudinal axis; a crankcase ( 10 ); and two scavenging ducts ( 12 a, 12 b ) arranged to port into opposite sides of the cylinder ( 1 ) and extending between the crankcase ( 10 ) and the cylinder bore ( 2 ); wherein the cylinder ( 1 ) and the crankcase ( 10 ) are separate components, with a separation between the cylinder ( 1 ) and the crankcase ( 10 ) located essentially at a mutual parting plane (A) that extends perpendicular to the longitudinal axis of the cylinder bore ( 2 ), the scavenging ducts ( 12 a, 12 b ) each have portions that are provided by depressions ( 21 a, 21 b ) in at least one of either the cylinder ( 1 ) or the crankcase ( 10 ) that at are open on one side at the parting plane (A), each of the depressions ( 21 a, 21 b ) extends in the parting plane (A) around the periphery of the cylinder bore ( 2 ), the scavenging ducts ( 12 a, 12 b ) each have connecting ducts ( 14 a, 14 b ) that connect the respective depressions ( 21 a, 21 b ) to an inner space of the crankcase ( 10 ) adjacent to the parting plane (A), the depressions provide for a right-angle turn for flow proceeding from the connecting ducts ( 14 a, 14 b ) to the respective depressions ( 21 a, 21 b ), and the turn at each depressions ( 21 a, 21 b ) is in the same direction.