The Hercules DFXE was an American

diesel Diesel may refer to: * Diesel engine, an internal combustion engine where ignition is caused by compression * Diesel fuel, a liquid fuel used in diesel engines * Diesel locomotive, a railway locomotive in which the prime mover is a diesel engine ...

truck A truck or lorry is a motor vehicle designed to transport freight, carry specialized payloads, or perform other utilitarian work. Trucks vary greatly in size, power, and configuration, but the vast majority feature body-on-frame construct ...

engine produced by the

Hercules Engine Company Hercules Engine Corporation was an American engine manufacturer located in Canton, Ohio. History The company was founded in 1915, known at first as Hercules Motor Manufacturing Company, to build industrial engines, especially for trucks. The com ...

. Part of the Hercules DFX series, the DFXE is a

naturally aspirated A naturally aspirated engine, also known as a normally aspirated engine, and abbreviated to N/A or NA, is an internal combustion engine in which air intake depends solely on atmospheric pressure and does not have forced induction through a turboc ...

, direct injection,

overhead valve An overhead valve engine, abbreviated (OHV) and sometimes called a pushrod engine, is a piston engine whose valves are located in the cylinder head above the combustion chamber. This contrasts with flathead (or "sidevalve") engines, where the v ...

, inline six-cylinder engine. The engine had a

displacement Displacement may refer to: Physical sciences Mathematics and physics *Displacement (geometry), is the difference between the final and initial position of a point trajectory (for instance, the center of mass of a moving object). The actual path ...

of , with a bore of , a stroke of and a

compression ratio The compression ratio is the ratio between the maximum and minimum volume during the compression stage of the power cycle in a piston or Wankel engine. A fundamental specification for such engines, it can be measured in two different ways. Th ...

of 14.8:1. It developed at 1,600

rpm Revolutions per minute (abbreviated rpm, RPM, rev/min, r/min, or r⋅min−1) is a unit of rotational speed (or rotational frequency) for rotating machines. One revolution per minute is equivalent to hertz. Standards ISO 80000-3:2019 def ...

and a maximum of

torque In physics and mechanics, torque is the rotational analogue of linear force. It is also referred to as the moment of force (also abbreviated to moment). The symbol for torque is typically \boldsymbol\tau, the lowercase Greek letter ''tau''. Wh ...

at 1150 rpm; at 1600 rpm. The DFXE was designed to requirements of the

British Purchasing Commission The British Purchasing Commission was a United Kingdom organisation of the Second World War. Also known at some time as the "Anglo-French Purchasing Board", it was based in New York City, where it arranged the production and purchase of armaments fr ...

for use in the Diamond T Model 980 tank transporter. As the Diamond T Model 980 was later adopted by the US, the DFXE was one of the few diesel engines used by US tactical trucks during World War II. The engine was used in upright or horizontal configurations. It was used in the Diamond T Models 980 and 981 trucks in World War Two, the Le Tourneau Model B29 Tournapull earthmover (introduced in 1945), and the Oliver OC-18

crawler tractor Continuous track or tracked treads are a system of vehicle propulsion used in tracked vehicles, running on a continuous band of treads or track plates driven by two or more wheels. The large surface area of the tracks distributes the we ...

(introduced in 1952),Wendel, pp 601-602. among others.

Notes

Sources

* Berndt, Thomas. ''Standard Catalog of U.S. Military Vehicles 1940–1965''. Iola, WI: Krause Publications, 1993. * * Orlemann, Eric R
''LeTourneau Earthmovers''
St Paul, Minnesota: MBI Publishing Co, 2001. * U.S. Department of the Army
''TM 9-1768A: Tractor Truck M20, Component Of 45-Ton Tank Transporter, Truck-Trailer M19, Engine, Clutch, Fuel System, And Cooling System''
Washington, DC: United States Government Printing Office, 22 June 1945. * {{cite book , author=U.S. Department of the Army , url=https://www.scribd.com/doc/149374612/Tm-9-768-DIAMOND-T-980-AND-981-M9-TRAILER , title=TM 9-768: 45-ton Tank Transporter Truck-trailer M19 , location=Washington, DC , publisher=United States Government Printing Office , date=25 October 1944 , ref={{sfnref, TM 9-768, 1944 * U.S. Department of the Army
''TM55-1031: Engines, Diesel, Hercules: Series DFXB, DFXC, DFXD, and DFXE''
Washington, DC: United States Government Printing Office, November 1944. * Ware, Pat. ''The Diamond T Models 980, 981: Britain's second-generation tank transporter''. Yalding, Kent: Kelsey Media, 2020. * Wendel, C. H
''Standard Catalog of Farm Tractors, 1890-1980''
Iola, WI: KP Books, 2005. Diesel engines DFXE Tractors Engineering vehicles Straight-six engines