Willys Go Devil engine

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For a logging sled, see Go-devil.
Go-Devil
Willys MB (Bild 6 2008-06-14) Motor.JPG
Overview
Manufacturer Willys
Combustion chamber
Displacement 134.2 cu in (2,199 cc)
Cylinder bore 3.125 in (79.4 mm)
Piston stroke 4.375 in (111.1 mm)
Cylinder block alloy Iron
Cylinder head alloy Iron
Valvetrain L-head
Compression ratio 6.48:1
Combustion
Fuel system 1-barrel carburetor
Fuel type Gasoline
Cooling system Water-cooled
Output
Power output 60 hp (45 kW; 61 PS)
Specific power 0.42 hp/CID
Torque output 105 lb·ft (142 N·m)
Chronology
Successor Willys Hurricane engine

The Willys L134 (nicknamed Go Devil) is a straight-4 automobile engine that was made famous in the Willys MB Jeep produced during World War II. It powered all the Jeep vehicles built for the U.S. and Allies.[1] It was later used in a variety of civilian Jeep vehicles.

History[edit]

In 1940, the Willys Quad was built to compete against the Bantam reconnaissance car for evaluation by the U.S. Army.[2] The two prototype Quads were powered by the Willys “Go-Devil” engine that turned out to be automaker's greatest asset.[2] Willys pilot vehicle was overweight compared to the Army's requirements, but the "Go Devil" engine rated at 55 hp (41 kW; 56 PS) included a heavier transmission, a combination that proved to be beneficial in the long-run for use in cross-country travel.[3]

The engine was developed by Willys' Chief Engineer, Delmar "Barney" Roos, and was the most powerful of the three prototype vehicles evaluated by the U.S. Army for production.[4] Roos took the "less than impressive" 48 hp (36 kW; 49 PS) automobile engine and increased its performance and durability.[5] The specifications by the Quartermaster Corps called for only 85 lb·ft (115 N·m) of torque at the rear axle.[5] The extra power made it the engine of choice for the U.S. Army.[5]

The engine displacement was 134.2 cu in (2,199 cc) with a 3.125 in (79.4 mm) bore and 4.375 in (111.1 mm) stroke, a very undersquare design. It was an L-head design, with valves parallel to the cylinders. Initial power output was 60 hp (45 kW; 61 PS) at 4000 rpm and 105 lb·ft (142 N·m) of torque at 2000 rpm with 6.48:1 compression.[4]

The L134 was phased out by the F-head Willys Hurricane engine beginning in 1950.

Applications[edit]

References[edit]

  1. ^ "Willys-Overaland Jeep advertisement". Life 14 (7): 13. 15 February 1943. Retrieved 23 November 2014. 
  2. ^ a b Doyle, David. Standard Catalog of U.S. Military Vehicles (Second ed.). KP Books. p. 28. ISBN 9780873495080. Retrieved 23 November 2014. 
  3. ^ Zalog, Steven J. (2005). Jeeps 1941-45. Osprey Publishing. pp. 8–9. ISBN 9781841768885. Retrieved 23 November 2014. 
  4. ^ a b Statham, Steve (1999). Jeep Color History. Motorbooks. p. 24. ISBN 9780760306369. Retrieved 23 November 2014. 
  5. ^ a b c Green, Michael; Stewart, Greg (2005). Humvee at War. Zenith Press. p. 13. Retrieved 23 November 2014. 
  6. ^ Allen, Jim (2003). Jeep Collector's Library. Motorbooks, MBI Publishing. p. 227. ISBN 9780760314869. Retrieved 23 November 2014. 

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