Willys MB was a four-wheel all-terrain vehicle with a front longitudinal engine layout.
It was equipped with 4-cylinder, in-line, carbureted, liquid-cooled engine with quite high rate of the torque. By construction, it was close to later appeared GAZ M-20 \"Victory\". The maximum power according to the American standard with the working volume of 2.199 liters was 60 horsepower. The compression ratio of 6.48 was usual for its times. The vehicle was equipped with 3-speed gearbox.
Normal work of the engine was available only on gasoline with an octane rating of at least 66 (preferably B-70, CB-70). It should be noted that various standardized in the U.S. Army units and elements were used on the vehicle: a generator, relay control, battery breaker distributor, fuel pump, carburetor, thermostat, fine oil filter and control devices.
The big cooling surface of the radiator provided a long timework of the car equipped with a trailer in heavy traffic conditions at high temperatures. The fuel consumption was high; thou at that time not much attention was paid on this fact. The power unit was small, working hard and using low-quality oils, so it could not provide the required durability.
The body was open, four-seat and without doors. It was fully made of metal, with an easy removable canvas top.
The equipment was truly Spartan - nothing unnecessary. Even the windshield wipers were manual. However, everything necessary was present.
It is necessary to point out the extremely good, rational design and thought-out body style, its unique charm. The car was almost perfectly arranged. It was provided a convenient approach to the units in their maintenance and removal. Willys had an excellent dynamics, high speed, maneuverability and cross-country ability. Its small size, especially the width, allowed riding through the front-line forests, which was accessible only for infantry.
The disadvantages of the car were its low lateral stability, demanding driving skills, especially in the corners, and a narrow track.