EMD 265, or the H-Engine, (introduced in 1998) is a line of diesel engines built by Electro-Motive Diesel (EMD) for use in locomotives. Unlike EMD's previous 567

EMD 567

The EMD 567 is a line of diesel engines built by General Motors' Electro-Motive Division. This engine, which succeeded Winton's 201-A, was used in EMD's locomotives from 1938 until its replacement in 1966 by the EMD 645. It has a bore of , a stroke of and a displacement of 567 in³ per cylinder...

, 645

EMD 645

The EMD 645 family of diesel engines was designed and manufactured by the Electro-Motive Division of General Motors. Intended primarily for locomotive, marine and stationary engine use, one 16-cylinder version powered the 33-19 "Titan" prototype haul truck designed by GM's Terex...

, and 710

EMD 710

The EMD 710 is a line of diesel engines built by Electro-Motive Diesel . The 710 series largely replaced the earlier EMD 645 series. The EMD 710 is a large two-stroke diesel engine that has a displacement per cylinder. Since its introduction, EMD has continually upgraded the 710G diesel engine...

 lines of engines, which operate under a two-stroke cycle

Two-stroke cycle

A two-stroke engine is an internal combustion engine that completes the process cycle in one revolution of the crankshaft...

, the H-Engine operates as a four-stroke engine. Also distinguishing it from EMD's other engines is the notation used in its naming. In the 567, 645, and 710 engines the number refers to the displacement of each cylinder in cubic inches, while the H-Engine's "265" designation refers to the bore of the cylinder in millimeters.

Specifications

Although other variations of the H-Engine exist (including a 12 cylinder version), the following are the specifications for the GM16V265:

• 16 cylinders
  Cylinder (engine)
  A cylinder is the central working part of a reciprocating engine or pump, the space in which a piston travels. Multiple cylinders are commonly arranged side by side in a bank, or engine block, which is typically cast from aluminum or cast iron before receiving precision machine work...
  
   in a V configuration
  V engine
  A V engine, or Vee engine is a common configuration for an internal combustion engine. The cylinders and pistons are aligned, in two separate planes or 'banks', so that they appear to be in a "V" when viewed along the axis of the crankshaft...
  
  
• Up to 6300 bhp at 1000 rpm bore stroke
  Stroke (engines)
  Reciprocating motion, used in reciprocating engines and other mechanisms, is back-and-forth motion. Each cycle of reciprocation consists of two opposite motions: there is a motion in one direction, and then a motion back in the opposite direction. Each of these is called a stroke...
  
   displacement
  Engine displacement
  Engine displacement is the volume swept by all the pistons inside the cylinders of an internal combustion engine in a single movement from top dead centre to bottom dead centre . It is commonly specified in cubic centimeters , litres , or cubic inches...
  
   per cylinder
• Twin turbochargers

Usage in locomotives

Usage in locomotives includes the EMD SD89MAC

EMD SD89MAC

The EMD SD89MAC is a 4,500 horsepower C-C diesel-electric locomotive produced by General Motors Electro-Motive Division. Along with the SD80MAC and SD90MAC, the SD89MAC is one of the largest single-engine locomotives produced by EMD, surpassed only by the dual-engined DD series...

, EMD SD90MAC

EMD SD90MAC

The EMD SD90MAC is a C-C diesel-electric hood unit locomotive produced by General Motors Electro-Motive Division. It is, with the SD80MAC, one of the largest single-engined locomotives produced by that company, surpassed only by the dual-engined DD series...

 and the EMD JT56ACe

EMD JT56ACe

The China Railways HXN3 is a 6000 horsepower diesel-electric locomotive produced by Electro-Motive Diesels designed for export to China. All JT56ACe locomotives use AC traction motor technology and utilize the EMD H-Engine as their prime mover...

.

External links

• EMD H Engine