Hercules DFXE

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

Hercules DFXE
The DFXE powered the Diamond T Models 980 and 981 tank transporter
Overview
Manufacturer	Hercules Engine Company
Layout
Configuration	Straight-6
Displacement	855 cu in (14.011 L)
Cylinder bore	5+5⁄8 in (143 mm)
Piston stroke	6 in (152 mm)
Compression ratio	14.8:1
Combustion
Fuel type	Diesel
Output
Power output	201 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

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.