Willys Go Devil engine

In 1940, the Willys Quad was built to compete against the Bantam reconnaissance car for evaluation by the U.S. Army.{{cite book|url= https://books.google.com/books?id=52WIEG-1TjgC&dq=Willys+Go+Devil+engine&pg=PA28 |page=28 |title=Standard Catalog of U.S. Military Vehicles |edition=Second |first=David |last=Doyle |date=28 February 2011 |publisher=KP Books |isbn=9780873495080 |accessdate=23 November 2014}} The two prototype Quads were powered by the Willys “Go-Devil” engine that turned out to be the automaker's greatest asset. Willys' pilot vehicle was overweight compared to the Army's requirements, but the "Go Devil" engine rated at {{convert|55|hp|kW PS|0|abbr=on}} included a heavier transmission, a combination that proved to be beneficial in the long-run for use in cross-country travel.{{cite book|url= https://books.google.com/books?id=7BsnyYmzw-EC&dq=Willys+pilot+overweight+Go+Devil+engine+55+hp&pg=PT1 |pages=8–9 |title=Jeeps 1941-45 |first=Steven J. |last=Zaloga |isbn=9781841768885 |publisher=Osprey Publishing |year=2005 |accessdate=23 November 2014|authorlink=Steven Zaloga}}

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. Roos took the "less than impressive" {{convert|48|hp|kW PS|0|abbr=on}} automobile engine and increased its performance and durability.{{cite book|url= https://books.google.com/books?id=t8-HYR_TtEMC&dq=Willys+Go+Devil+engine&pg=PA13 |page=13 |title=Humvee at War |first1=Michael |last1=Green |first2=Greg |last2=Stewart |publisher=Zenith Press |year=2005 |isbn=9781610607216 |accessdate=23 November 2014}} The specifications by the Quartermaster Corps called for only {{convert|85|lb·ft|Nm|0|abbr=on}} of torque at the rear axle. The extra power made it the engine of choice for the U.S. Army.

The engine displacement was {{convert|134.2|cuin|cc|abbr=on}} with a {{convert|3.125|in|mm|abbr=on}} bore and {{convert|4.375|in|mm|abbr=on}} stroke, a very undersquare design. It was an L-head design, with valves parallel with the cylinders. Initial power output was {{convert|60|hp|kW PS|0|abbr=on}} at 4000 rpm and {{convert|105|lb·ft|Nm|0|abbr=on}} of torque at 2000 rpm with 6.48:1 compression.{{cite book|url= https://books.google.com/books?id=dR3wmKlfnrMC&dq=Willys-Overland+Go+Devil+engine+specifications&pg=PA24 |page=24 |title=Jeep Color History |first=Steve |last=Statham |publisher=Motorbooks |year=1999 |isbn=9780760306369 |accessdate=23 November 2014}}

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

• 1937–1942 Willys Americar
• 1941–1945 Willys MB
• 1941–1945 Ford GPW
• 1944–1945 Willys-Overland CJ-2
• 1945–1949 Willys-Overland CJ-2A
• 1946–1950 Willys Jeep Station Wagon in which it was rated at {{convert|63|hp|kW PS|0|abbr=on}}{{cite book|url= https://books.google.com/books?id=zTsAbTJB5RIC&dq=Willys+Go+Devil+engine&pg=PA227 |page=227 |title=Jeep Collector's Library |first=Jim |last=Allen |publisher=Motorbooks, MBI Publishing |year=2003 |isbn= 9780760314869 |accessdate=23 November 2014|authorlink=Jim Allen (4x4 writer)}}
• 1949–1953 Willys-Overland CJ-3A
• 1948–1950 Willys-Overland Jeepster
• 1950–1952 Willys M38
• 1950–1954 Henry J
• 1952–1954 IAME Rastrojero
• 1956–1965 Willys DJ-3a
• 1956–1965 Hotchkiss M201 (Willys MB produced under licence in France)

{{commonscat|Willys Go Devil engine}}

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Go Devil

Category:Gasoline engines by model

Category:Straight-four engines