Willys Hurricane engine
| Willys Hurricane | |
|---|---|
 |
|
| Overview | |
| Manufacturer |
|
| Also called | |
| Production | 1950–1971 |
| Combustion chamber | |
| Configuration | F-head Straight-4 and Straight-6 |
| Cylinder block alloy | Cast Iron |
| Cylinder head alloy | Cast Iron |
| Valvetrain | IOE |
| Dimensions | |
| Dry weight | 470 lb (213 kg) |
| Chronology | |
| Predecessor | |
| Successor | 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 Willys 473 and 475 pickups, wagons, and sedan deliveries. It replaced the Willys Go Devil engine that was used in the MB 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 changed 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. 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.
The L134 Go Devil was updated with the F-head to become the F134 in 1950. This engine produced a gross output of 75 hp (56 kW; 76 PS) at 4000 rpm and 114 lb·ft (155 N·m) of torque at 2000 rpm with a 7.5:1 compression ratio. The gross power and torque outputs fell to 72 hp (54 kW; 73 PS) and 112 lb·ft (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 1⁄8" x 4 3⁄8" giving 134.2 cu in (2,199 cc).
The F4-134 was introduced in 1950 in the Jeep Truck. Vehicles with this engine were given the model designation 4-73. This engine 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 American Motors Corporation (AMC) purchased Kaiser Jeep.
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