Willys Lightning engine

The Lightning engine is a Willys straight-6 produced in the 1940s and 1950s.^[1] The flathead engine featured four main bearings and solid valve lifters.^[2]

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 (2.43 L) and was rated at 70 horsepower (52 kW; 71 PS).^[3] This was the smallest displacement six-cylinder engine when introduced in 1947 in the Willys Station Wagon.^[3] The bore was 3 inches (76 mm) and its short 3.5-inch (89 mm) stoke enabled the engine to achieve high revolutions given its flathead design.^[3]

Applications:

• 1947-1950 Willys Jeep Station Wagon
• 1948 Willys-Overland Jeepster^[4]

L161

The L161 version displaced 161 cubic inches (2.64 L) and was rated at 75 horsepower (56 kW; 76 PS).^[5] Introduced in April 1950, the engine featured a higher compression ratio of 6.9 to 1, and a larger 3.125-inch (79 mm) bore.^[3][5]

Applications:

• 1950-1951 Willys Jeep Station Wagon
• 1950 Willys-Overland Jeepster
• 1952-1955 Willys Aero-Lark^[6]
• 1953-1955 Willys Aero-Falcon^[7]

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.