EMD 710
An EMD 12-710G3B engine, installed in an Iarnród Éireann 201 class (EMD JT42HCW) locomotive
Overview
Manufacturer	Electro-Motive Diesel
Also called	G-Engine
Production	1983-present
Layout
Configuration	V8, V12, V16, and V20
Displacement	710 cubic inches (11,600 cm3) per cylinder
Cylinder bore	9+1⁄16 in (230 mm)
Piston stroke	11 in (280 mm)
Cylinder block material	Flat, formed and rolled structural steel members, and steel forgings, integrated into a weldment
Cylinder head material	Cast iron, one per cylinder
Valvetrain	4 Valves per cylinder, SOHC
Compression ratio	15.3:1
RPM range
Idle speed	200
Max. engine speed	900-904-906-910-950
Combustion
Supercharger	Centrifugal
Turbocharger	Hybrid turbocharger, below half throttle, clutch-driven blower takes over
Fuel system	Unit injector, actuated by engine camshaft
Management	Electronic
Fuel type	Diesel
Oil system	Wet sump
Cooling system	Liquid cooling
Output
Power output	203 kilowatts (272 hp) per cylinder
Dimensions
Dry weight	up to 25.57 tonnes (25.17 long tons; 28.19 short tons)
Chronology
Predecessor	EMD 645
Successor	EMD 1010 - the heavily redesigned and refined EMD 265H to meet Tier-4 emission standard

The EMD 710 is a line of diesel engines built by Electro-Motive Diesel (previously General Motors' Electro-Motive Division). The 710 series replaced the earlier EMD 645 series when the 645F series proved to be unreliable in the early 1980s 50-series locomotives which featured a maximum engine speed of 950 rpm.^{[note 1]} The EMD 710 is a relatively large medium-speed two-stroke diesel engine that has 710 cubic inches (11.6 liters) displacement per cylinder,^[1] and a maximum engine speed of 900 rpm.^{[note 2]}

In 1951, E. W. Kettering (son of Charles F. Kettering) wrote a paper for the ASME entitled, History and Development of the 567 Series General Motors Locomotive Engine,^[2] which goes into great detail about the technical obstacles that were encountered during the development of the 567 engine. These same considerations apply to the 645 and 710, as these engines were a development of the 567C, applying a cylinder bore increase (645) and a stroke increase (710), to achieve a greater power output, without changing the external size or weight of the engines, thereby achieving significant improvements in horsepower per unit volume and horsepower per unit weight.

Since its introduction, EMD has continually upgraded the 710G diesel engine. Power output has increased from 3,800 horsepower (2,800 kW) on 1984's 16-710G3A to 4,500 horsepower (3,400 kW) (as of 2012) on the 16-710G3C-T2, although most current examples are 4,300 horsepower (3,200 kW).

The 710 has proved to be exceptionally reliable, although the earlier 645 is still supported and most 645 service parts are still in new production, as many 645E-powered GP40-2 and SD40-2 locomotives are still operating after four decades of service. These often serve as a benchmark for engine reliability, which the 710 would meet and eventually exceed. A significant number of non-SD40-2 locomotives (SD40, SD45, SD40T-2, and SD45T-2, and even some SD50s) have been rebuilt to the equivalent of SD40-2s with new or remanufactured engines and other subsystems, using salvaged locomotives as a starting point. Some of these rebuilds have been made using new 12-cylinder 710 engines in place of the original 16-cylinder 645 engines, retaining the nominal rating of 3000 horsepower, but with lower fuel consumption.

Over the production span of certain locomotive models, upgraded engine models have been fitted when these became available. For example, an early 1994-built SD70MAC had a 16-710G3B, whereas a later 2003-built SD70MAC would have a 16-710G3C-T1.

The engine is produced in V8, V12, V16, and V20 configurations; most current locomotive production uses the V16 engine, whereas most current marine and stationary engine applications use the V20 engine.

All 710 engines are two-stroke 45° V engines. The 710 model was introduced in 1985 and has a 1-inch (25 mm) longer stroke (now 11 in or 279 mm) than the 645 (10 in or 254 mm stroke). The engine is uniflow scavenged with four poppet exhaust valves in the cylinder head. For maintenance, a power assembly, consisting of a cylinder head, cylinder liner, piston, piston carrier, and piston rod can be individually and relatively easily and quickly replaced. The block is made from flat, formed, and rolled structural steel members and steel forgings welded into a single structure (a "weldment"). Blocks may, therefore, be easily repaired, if required, using conventional shop tools. Each bank of cylinders has a camshaft which operates the exhaust valves and the unit injectors.^[3]

Pre-1995 engines have mechanically controlled unit injectors (UIs), patented in 1934 by General Motors, EMD's former owner. Post-1995 engines have electronic unit injectors (EUIs) which fit within the same space as a mechanical unit injector.^{[note 3]} The use of EUI is EMD's implementation of non-common-rail electronic fuel injection on its large-displacement diesel engines.

See EMD 645 for general specifications common to all 567, 645, and 710 engines.

Unlike the 567 or 645, which could use either Roots blowers or a turbocharger, the 710 engine is only offered with turbocharging. The turbocharger is gear-driven and has an overrunning clutch that allows it to act as a centrifugal blower at low engine speeds (when exhaust gas flow and temperature alone are insufficient to drive the turbine) and a purely exhaust-driven turbocharger at higher speeds. The turbocharger can revert to acting as a supercharger during demands for large increases in engine output power.

While more expensive to maintain than Roots blowers, EMD claims that this design allows "significantly" reduced fuel consumption and emissions, improved high-altitude performance, and even up to a 50 percent increase in maximum rated horsepower over Roots-blown engines for the same engine displacement. But, unlike the earlier 645 and 567, which could use either turbochargers or Roots blowers, the turbocharger is a standard feature of most 710 models.

Horsepower for any naturally aspirated engine is usually derated at 2.5% per 1,000 feet (300 m) above mean sea level, a penalty which becomes extremely large at altitudes of 10,000 feet (3,000 m) or greater as power losses would exceed 25%. Forced induction effectively eliminates this derating.

Some 710 engines have been converted to, or even delivered as, Roots-blown engines with conventional exhaust-driven turbochargers. Others have received modifications that permit lower fuel consumption (but possibly at the expense of higher NOx emissions or reduced power output), lower emissions, or even higher power (at the expense of increased fuel consumption).

Like most EMD engines, the 710 is also sold for stationary and marine applications.

Stationary and marine installations are available with either a left or right-hand rotating engine.

Marine engines differ from railroad and stationary engines mainly in the shape and depth of the engine's oil sump, which has been altered to accommodate the rolling and pitching motions encountered in marine applications.

Engine Speed

• Full . . . . . . . . . . . . . . 900-904-906-910-950 RPM
• Idle . . . . . . . . . . . . . . 200-350 RPM

Compression Ratio . . 16:1

Brake Horsepower (ABS Rating)

• Model 710G7 Engines
  • 8-cylinder: 1800
  • 12-cylinder: 2800
  • 16-cylinder: 3600
  • 20-cylinder: 4300

• EMD 567
• EMD 645
• EMD 1010

Notes

Specific

General

• Houk, Randy (December 14, 2012). "The History of EMD Diesel Engines". Pacific Southwest Railway Museum. Archived from the original on July 22, 2014. Retrieved January 5, 2015.
• "Locomotive roster". John's Alaska Railroad Page. Retrieved September 8, 2006.
• "SD70ACe". Electro-Motive Diesel. Retrieved September 8, 2006.
• "SD70MAC". Electro-Motive Diesel. Archived from the original on April 29, 2004. Retrieved April 19, 2004.
• GM-EMD (1996). EMD SD80MAC Operators Manual.
• GM-EMD (1998). EMD SD70MAC Operators Manual.

• List of engines under Tier 0, I, and II standards
• SD70 engines (See bottom.)
• Houk, Randy (December 14, 2012). "The History of EMD Diesel Engines". Pacific Southwest Railway Museum. Archived from the original on July 22, 2014. Retrieved January 5, 2015.
• EMD 710 engine A 16-710G is shown; turbocharged 567 and 645 engines appear similarly. Whether 710, 645 or 567, these engines have the same external dimensions, with the possible exception of accessories.