The two-stroke ship engine is a large internal combustion engine that completes a power cycle in two strokes of the piston. Key engine parts include the cylinder, piston, crankshaft, connecting rod, scavenge ports, and exhaust valve. It is known for its high power-to-weight ratio and efficiency in marine applications.

Key Specifications and Technical Properties of Two-Stroke Ship Engine:

- **Size**: Cylinder bore ranges from 250mm to 1,000mm; stroke length 1,000mm to 3,000mm.

- **Grade**: Complies with IMO Tier II or Tier III emission standards; fuel grades include HFO, MDO, or LSFO.

- **Viscosity**: Lubricating oil viscosity typically SAE 30 to SAE 50; fuel viscosity 10-700 cSt (preheated for HFO).

- **Buoyancy**: N/A (engine is fixed; buoyancy applies to vessel hull).

- **Material**: Cylinder liners (cast iron); pistons (steel/aluminum alloy); crankshaft (forged steel); bearings (white metal/Babbitt).

Key Engine Parts and Properties:

- **Piston**: Diameter 250mm–1,000mm; material (steel alloy with chrome plating).

- **Cylinder Liner**: Thickness 20mm–50mm; material (cast iron with anti-wear coatings).

- **Crankshaft**: Forged steel; tensile strength 600–800 MPa.

- **Bearings**: Lead-bronze or white metal; thickness 1mm–5mm.

- **Turbocharger**: RPM up to 20,000; material (nickel-based alloys).

- **Fuel Injectors**: Pressure 600–1,000 bar; nozzle material (high-carbon steel).