Main Parameters of GE 7FDL Engine
The GE 7FDL series is a four-stroke medium-speed diesel engine manufactured by General Electric (GE). It is primarily designed for railway locomotive traction, and also applicable to marine power systems and stationary power generation units. Below are its core technical parameters and detailed specifications of models with different cylinder counts.
I. Basic Technical Parameters
Parameter Item    Detailed Specifications
Manufacturer    GE Transportation Systems
Production Period    1956 to present (mainly used in export models after 2004)
Stroke Type    Four-stroke
Cylinder Arrangement    V-type arrangement with 45° included angle
Cylinder Bore    9 inches (228.6 mm)
Piston Stroke    10.5 inches (266.7 mm)
Supercharging Method    Exhaust gas turbocharging
Fuel System    Direct injection
Fuel Type    Diesel
Cooling System    Water-cooled
Rated Speed Range    450～1,050 rpm (common operating speed: 600～900 rpm)
Compression Ratio    Approximately 16.5:1 (slight variations among different models)
Displacement per Cylinder    Approximately 18.68 L (calculated value: π×(228.6/2)²×266.7×10⁻⁹)
II. Specific Parameters of Models with Different Cylinder Counts
Model    Number of Cylinders    Displacement (L)    Power Range (hp)    Typical Applications
7FDL-8    8    Approximately 149.4    1,400～1,800    Small locomotives (e.g., GE CM20EMP), switching locomotives
7FDL-12    12    Approximately 224.2    2,000～3,300    Medium-sized locomotives (e.g., GE P32AC-DM dual-mode locomotive)
7FDL-16    16    Approximately 298.9    2,400～4,400    Large mainline locomotives (e.g., AC4400CW, Dash 9-44CW)