Hercules DFXE

Hercules DFXE
The DFXE powered the Diamond T Models 980 and 981 tank transporter
Overview
ManufacturerHercules Engine Company
Layout
ConfigurationStraight-6
Displacement855 cu in (14.011 L)
Cylinder bore5+5⁄8 in (143 mm)
Piston stroke6 in (152 mm)
Compression ratio14.8:1
Combustion
Fuel typeDiesel
Output
Power output201 bhp (150 kW) at 1600 rpm
Torque output
  • 685 ft⋅lbf (929 N⋅m) at 1150 rpm
  • 660 ft⋅lbf (890 N⋅m) at 1600 rpm

The Hercules DFXE was an American diesel truck engine produced by the Hercules Engine Company.

Part of the Hercules DFX series, the DFXE is a naturally aspirated, direct injection,overhead valve, inline six-cylinder engine.[1][2] The engine had a displacement of 855 cu in (14.011 L), with a bore of 5+5⁄8 in (143 mm), a stroke of 6 in (150 mm) and a compression ratio of 14.8:1.[3][4] It developed 201 bhp (150 kW) at 1,600 rpm and a maximum 685 ft⋅lbf (929 N⋅m) of torque at 1150 rpm; 660 ft⋅lbf (890 N⋅m) at 1600 rpm.[5][6]

The DFXE was designed to requirements of the British Purchasing Commission 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.[7][8]

The engine was used in upright or horizontal configurations.[9]

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),[10] and the Oliver OC-18 crawler tractor (introduced in 1952),[11] among others.

  1. ^ TM55-1031, p.5.
  2. ^ Ware, p 29.
  3. ^ TM55-1031, p.5.
  4. ^ Ware, p 29.
  5. ^ TM 9-1768A, p 4.
  6. ^ Ware, p 46.
  7. ^ Doyle (2003), pp. 230–231.
  8. ^ TM 9-768 (1944), pp. 136–140.
  9. ^ TM55-1031, p.5.
  10. ^ Orlemann, p 33.
  11. ^ Wendel, pp 601-602.