Willys Hurricane engine

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Willys Hurricane
Also calledF-134
PredecessorWillys Go-Devil
Willys Lightning

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 Willys 473 and 475 pickups, wagons, and sedan deliveries. It replaced the Willys Go Devil engine which was used in the Military Jeep and other early Jeep-based models like the Jeepster.

The Hurricane is one of the few "F-Head" engines, and the only one well-known apart from those produced by Rolls-Royce and Rover. The "F" comes from having one set of valves in the block, like a flat (or "L") head, and one set in the head, like a modern OHV engine. The reason Willys did this was because they started from an existing L-head block and modified it to put the intake valves in a new, much taller head. This created a very compact combustion chamber and a higher compression ratio, boosting power.


The L134 Go Devil was updated with the F-head to become the F134 in 1950. This engine produced 75 hp (55 kW) at 4000 rpm (although it redlines at 3200 rpm) and 114 ft·lbf (154 N·m) at 2000 rpm with a 7.5:1 compression ratio. Bore and stroke dimensions were the same as the L-head engine at 3.125" x 4.375" giving 134.22cuin (2.200 cc).

The F4-134 was introduced in 1950 in the new 473 trucks. 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. The engine remained in production until 1971, after Kaiser Jeep was purchased by American Motors (AMC).



The F6-161 Hurricane was an F-head version of the L6-161 Lightning flathead straight six. It was used in Jeepsters and Wagons.


The BF-161 had a 318 inch bore and a 312 inch stroke, a one barrel carburettor and an output of 90 hp (67 kW) at 4,400 rpm and 135 ft·lbf (183 Nm) 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.[1]


The 2600 was essentially the same as the BF-161, but it had 2 carburettors and had an output of 130 hp (97 kW) at 4,400 rpm and 140 ft·lbf (190 Nm) at 2,000 rpm. The compression ratio remained 7.6:1.[1]


The 3 litre (184 cid) had its stroke increased to 4 inches, and had a displacement of 3,016 cc (184.1 cid).[1] It had a 2 barrel carburettor and an output of 140 hp (104 kW) at 4,400 rpm and 161 ft·lbf (218 Nm) at 2,000 rpm. It also had a slightly higher compression ratio of 8:1.[1]

Super Hurricane


An L-head 6 cylinder from Continental with a bore of 3.3125" and stroke of 4.375" giving a displacement of 226.22cuin (3.71 litres). Several references show a bore of 3.94" but this is incorrect. Horsepower rating is 105@3600 or 115@3800 and torque rating 190@1400 or 190@1800 depending on the year of production.

See also