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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. 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.

Contents

F134

F161

F134

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.
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).
Applications:

★ 1950 Willys Jeepster

★ 1966-1971 Jeep Jeepster Commando

★ 1953-1968 CJ-3B

★ 1955-1971 CJ-5

★ 1956-1971 CJ-6

★ 1950-1961 Willys Jeep Truck

★ 1950-1961 Willys Jeep Wagon

★ 1953 Willys 475A Lark

★ 1952-1971 Willys M38A1

F161

The F6-161 Hurricane was an F-head version of the L6-161 Lightning flathead straight six. It was used in Jeepsters and Wagons.
'BF-161'
The BF-161 had a 3-1/8" bore and a 3-1/2" stroke, a one barrel carburettor and an output of 90hp (67kW) at 4,400RPM and 135 ft·lbf (183Nm) at 2,000RPM. It had a compression ratio of 7.6:1.
'2600'
The 2600 was essentially the same as the BF-161, but it had 2 carburettors and had an output of 130hp (97kW) at 4,400RPM and 140 ft·lbf (190Nm) at 2,000RPM. The compression ratio remained 7.6:1.
'3000'
The 3 litre (184ci) had its stroke increased to 4", and had a displacement of 3 litres (184ci). It had a 2 barrel carburettor and an output of 140hp (104kW) at 4,400RPM and 161 ft·lbf (218Nm) at 2,000RPM. It also had a slightly higher compression ratio of 8:1.
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