Two-stroke diesel engine

An engine which is adapted to be cooled by a cooling fluid, the engine comprising:

• a tubular cylinder housing defining a cylinder chamber, said cylinder housing including a plurality of exhaust ports which are adapted for releasing an exhaust fluid;
• an engine block which at least partly encircles the cylinder housing proximate the exhaust ports;
• a thermal shield positioned substantially between at least one of the exhaust ports and the engine block to thermally shield the engine block from the exhaust fluid;
• and
• a cooling passageway including a substantially annular cooling section which substantially encircles the cylinder housing and a cooling inlet which is adapted for delivering the cooling fluid substantially tangential to the cooling section.

A two-stroke engine which is powered by a combustion fluid, the engine comprising:

• a tubular cylinder housing having a cylinder wall defining a cylinder chamber;
• a pair of pistons positioned within the cylinder, the pistons being adapted to move between a first position in which the pistons are spaced apart and a second position in which the pistons are proximate each other, movement of the pistons between the first position and the second position being accompanied by a swirl in the cylinder chamber in a swirl direction;
• and
• a first injector which is adapted to inject the combustion fluid into the cylinder chamber between the pistons, the first injector being adapted to direct the combustion fluid in the cylinder chamber in substantially the swirl direction.

A two-stroke cycle diesel engine comprising:

• an engine block;
• a tubular cylinder housing positioned within the engine block and including a cylinder wall which at least partly defines a cylinder chamber, the cylinder housing having a plurality of exhaust ports which extend through the cylinder wall to release exhaust fluid from the cylinder chamber;
• a pair of opposed pistons positioned within the cylinder housing, the pistons being adapted to move between a first position in which the pistons are spaced apart and a second position in which the pistons are proximate each other, movement of the pistons between the first position and the second position being accompanied by a swirl in the cylinder chamber in a swirl direction;
• a first injector which is adapted to inject the combustion fluid into the cylinder chamber between the pistons, the first injector is adapted to direct the combustion fluid in the cylinder chamber towards the swirl direction;
• a thermal shield positioned between the exhaust ports and the engine block to thermally shield the engine block from the exhaust fluid;
• a fluid gap positioned between the thermal shield and the engine block to thermally shield the engine block and reduce heat transfer between the exhaust fluid and the engine block;
• and
• a cooling passageway including a substantially annular cooling section which substantially encircles the cylinder housing and a coolant inlet which is adapted for delivering a cooling fluid substantially tangential to the cooling section.