Willys Hurricane engine

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Willys Hurricane
Manufacturer	Willys Kaiser-Jeep
Also called:	F-134 F-161
Production:	1950–1971
Predecessor:	Willys 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. 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.

[edit] 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).

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