Willys Hurricane engine

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Willys Hurricane
Jeep M170 Ambulance el.jpg
Manufacturer Willys
American Motors (AMC)
Also called F-134
Mitsubishi JH4, KE31, KE36
Production 1950–1971
Combustion chamber
Configuration F-head Straight-4 and Straight-6
Displacement 134.2 cu in (2,199 cc)
Cylinder bore 3.125 inches (79.4 mm)
Piston stroke 4.375 inches (111.1 mm)
Cylinder block alloy Cast Iron[1]
Cylinder head alloy Cast Iron[1]
Valvetrain IOE
Compression ratio 7.5:1
Fuel system 1 or 2 single barrel carburetors
Fuel type Gasoline
Power output 75 hp (56 kW; 76 PS) at 4,000 rpm
Torque output 114 pound force-feet (154.56 N·m)
Dry weight 470 pounds (210 kg)
Predecessor Willys Go-Devil
Willys Lightning
Successor GM Iron Duke engine
Jeep Tornado engine

The Willys F4-134 Hurricane was an inline-4 piston engine and powered the famous Jeep CJ in the CJ-3B, CJ-5, and CJ-6 models. It was also used in the 473 and 475 pickups, wagons, and sedan deliveries. It replaced the Willys Go Devil engine which was used in the M8 Jeep and other early Jeep-based models like the Jeepster. This engine was also built by Mitsubishi for their license-built Jeep, as well as other applications.


The Hurricane was based on the earlier Go-Devil flathead engine. To get more power from the engine, the induction system was change from the Go-Devil's side-valve configuration to an inlet-over-exhaust configuration, or "F-head". This allowed the valves to be larger and the combustion chamber to be smaller, improving flow and increasing the compression ratio.[2] The compression ratio rose from 6.5:1 in the Go-Devil engine to 7.5:1 in the Hurricane engine, although a version of the Hurricane engine was made with a 6.9:1 compression ratio.[3]


The L134 Go Devil was updated with the F-head to become the F134 in 1950.[4][5] This engine produced a gross output of 75 hp (56 kW; 76 PS) at 4,000 rpm and 114 pound force-feet (155 N·m) of torque at 2,000 rpm with a 7.5:1 compression ratio. The gross power and torque outputs fell to 72 hp (54 kW; 73 PS) and 112 pound force-feet (152 N·m) respectively when the engine had a 6.9:1 compression ratio. Bore and stroke dimensions were the same as the L-head engine at 3 18" x 4 38" giving 134.2 cu in (2,199 cc).[3]

The F4-134 was introduced in 1950 in the Jeep Truck;[4] trucks with this engine were given the model designation 4-73.[6] However, it was not placed in a CJ until the introduction of the CJ-3B in 1953, which had a distinctive high hood to accommodate the much taller engine.[2] The engine remained in production until 1971, after American Motors Corporation (AMC) purchased Kaiser Jeep.



The F6-161 Hurricane was an F-head version of the L6-161 Lightning flathead straight six. It was used in the Model 685 Station Wagon.[7][note 1]

BF-161 The BF-161 had a 3 18 inch bore and a 3 12 inch stroke, a one-barrel carburetor and an output of 90 hp (67 kW; 91 PS) at 4,400 rpm and 135 lb·ft (183 N·m) of torque at 2,000 rpm. It had a displacement of 161.1 cubic inches (2,639 cc). It had a compression ratio of 7.6:1.[8]

2600 The 2600 was essentially the same BF-161 engine made in Brazil by Willys-Overland do Brasil, but it had two one-barrel carburetors (simultaneously opened) and had an output of 130 hp (97 kW; 132 PS) at 4,400 rpm and 140 lb·ft (190 N·m) of torque at 2,000 rpm. The compression ratio remained 7.6:1.[8]

3000 The 3-litre (184 cid) had its stroke increased to 4 inches, and had a displacement of 3,016 cc (184.1 cid).[8] It had a 2-barrel carburetor and an output of 140 hp (104 kW; 142 PS) at 4,400 rpm and 161 lb·ft (218 N·m) of torque at 2,000 rpm. It also had a slightly higher compression ratio of 8:1.[8] It initially used a different head with removable intake manifold. Later, after Ford acquired Willys-Overland do Brasil, they reverted the engine to its former head design with integral intake manifold, improved cooling between cylinders 5 and 6 and installed a side-mounted oil filter, instead of the front-mounted, hose connected arrangement used by Willys.


Super Hurricane[edit]

The 6-226 "Super Hurricane"[9] was a L-head 6-cylinder[10][11] from Continental[11] with a bore of 3 516 inches and stroke of 4 38 inches, giving a displacement of 226.2 cu in (3,707 cc).[12] Horsepower rating is 105 hp (78 kW; 106 PS) at 3600 rpm[citation needed] or 115 hp (86 kW; 117 PS) at 3650 rpm,[12] as well as a torque rating of 190 lb·ft (258 N·m) at 1400 rpm[citation needed] or at 1800 rpm,[12] depending on the year of production.[citation needed]

Mitsubishi versions[edit]

Mitsubishi built a version of the Hurricane from 1954 as the JH4, mostly for use in their license-built version of the Jeep.[13] They later developed a 61 PS (45 kW) overhead-valve diesel version of the same, called KE31. This was also turned into a 3.3 liter six-cylinder version with the same internal dimensions, producing 85 PS (63 kW), which was baptized KE36. These diesel engines were used in the Jeep, but also in a number of light to medium-weight trucks and buses.[14]

Notes and references[edit]

  1. ^ The citation given here does not mention the designation F6-161.
  1. ^ a b http://www.baeta.org/opie/engine.htm#R
  2. ^ a b Brown, Arch (1994). "Chapter Five – Kaiser and the Jeep: 1953-55". Jeep: The Unstoppable Legend. Lincolnwoood, IL USA: Publications International. pp. 80, 82. ISBN 0-7853-0870-9. LCCN 94-66811 Check |lccn= value (help). 
  3. ^ a b Brown, p. 236
  4. ^ a b Brown, p. 74
  5. ^ Allen, Jim (2007-10-15) [2007]. "Chapter 10 GO POWER Engine Performance". Jeep 4x4 Performance Handbook. Motorbooks Workshop Series 242 (Second ed.). St. Paul, MN USA: MBI Publishing. p. 193. ISBN 978-0-7603-2687-9. Retrieved 2013-01-01. "1950–1971 F134 "Hurricane" Four-Cylinder F-head" 
  6. ^ Allen, Jim (2004-11-04) [1999]. "Chapter 13: Two-Wheel Drive Jeeps". Jeep (Third ed.). St. Paul, MN USA: MBI Publishing. p. 215. ISBN 0-7603-1979-0. Retrieved 2013-01-01. "The F-head–powered Station Wagon became Model 4-73." 
  7. ^ Allen, Jeep, p.228
  8. ^ a b c d "motor e motores rural e jeep willys BF-161 2600 3000 OHC 2300 ford" (in Portuguese). 27 July 2002. Retrieved 2008-04-30. 
  9. ^ Morr, Tom (2007). The Joy of Jeep. Photography by Ken Brubaker. St. Paul, MN USA: MBi Publishing. p. 41. ISBN 978-0-7603-3061-6. Retrieved 2013-01-17. 
  10. ^ Morr, p.52
  11. ^ a b Allen, Jeep, p.101
  12. ^ a b c Shaw, Wilbur (March 1954). "New Engine Zips Up Little Willys". In Torrey, Volta. Popular Science (New York, NY USA: Popular Science Publishing) 164 (3): 173–175. ISSN 0161-7370. Retrieved 2013-01-17. 
  13. ^ "三菱ジープのエンジン" [Mitsubishi Jeep engines]. じいぷファン倶楽部 [Jeep Fan Club] (in Japanese). Retrieved 2012-09-24. 
  14. ^ Takayoshi, Seiji (高吉 誠司), ed. (2011-03-17), "トラックメーカーアーカイブ vol.2: 三菱ふそうのすべて [Truck Manufacturer Archive Volume 2: Everything Mitsubishi Fuso]", Camion (in Japanese) (Tokyo, Japan: Geibun Mooks) (780): 48, ISBN 978-4-86396-112-8