Willys Lightning engine
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The Lightning engine is a Willys straight-6 produced in the 1940s and 1950s. The flathead engine featured four main bearings and solid valve lifters.
The engines were used in the Willys Jeep Station Wagon, other Jeep-based vehicles, and Willys sedans.
L148
The L148 version displaced 148.5 cubic inches (2.43L) and was rated at 70 horsepower (52kW; 71PS). This was the smallest displacement six-cylinder engine when introduced in 1947 in the Willys Station Wagon. The bore was 3 inches (76mm) and its short 3.5-inch (89mm) stoke enabled the engine to achieve high revolutions given its flathead design.
Applications:
- 1947-1950 Willys Jeep Station Wagon
- 1948 Willys-Overland Jeepster
L161
The L161 version displaced 161 cubic inches (2.64L) and was rated at 75 horsepower (56kW; 76PS). Introduced in April 1950, the engine featured a higher compression ratio of 6.9 to 1, and a larger 3.125-inch (79mm) bore.
Applications:
- 1950-1951 Willys Jeep Station Wagon
- 1950 Willys-Overland Jeepster
- 1952-1955 Willys Aero-Lark
- 1953-1955 Willys Aero-Falcon
Replacement
The F-head Hurricane engine was introduced in 1950, a significant upgrade to the Lightning. The valve configuration was changed for better power and efficiency. In 1954, the 6-226 "Super" Hurricane was introduced.