Willys Go Devil engine

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Automotive industryWillys
Bore3.125 in (79.4 mm)
Stroke4.375 in (111.1 mm)
Engine displacement134.22 Cubic inch (2199.53 cc)
Block alloyIron
Head alloyIron
Fuel system1-barrel Carburetor
Fuel typeGasoline
Engine coolingWater-cooled
Power output60 Horsepower (45 Kilowatt)
Specific power0.45 hp/CID
Torque output105 ft·lbf (142 N·m)
Compression ratio6.48:1

The Willys L134 (nicknamed Go Devil) was a Straight-4 automobile engine made famous in the Willys MB produced in World War II. The engine Engine displacement 134.22 cubic inches (2,199 cc) with a 3.125 in (79.4 mm) bore and 4.375 in (111.1 mm) stroke. It is most likely the most Undersquare engine ever built. It was an L-head design, with Poppet valve parallel to the cylinders. Initial power output was 60 hp (46 kW) at 4000 rpm and 105 ft·lbf (142 N·m) at 2000 rpm with 6.48:1 compression.

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


  • 1937-1942 Willys Americar
  • 1941–1945 Willys MB
  • 1944-1945 Jeep CJ-2
  • 1945-1949 Jeep CJ-2A
  • 1949-1953 Jeep CJ-3A
  • 1948-1950 Willys Jeepster
  • 1950-1955 Willys M38 Military
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