The rear wheels of the Countach were driven by a traditional Lamborghini V12 engine mounted longitudinally with a mid-engined configuration. For better weight distribution, the engine is pointed 'backwards'; the output shaft is at the front, and the gearbox is in front of the engine, the driveshaft running back through the engine's sump to a differential at the rear. Although originally planned as a 5 liter powerplant, the first production cars used the Lamborghini Miura's 4 liter engine. Later advances increased the displacement to 5 liters and then (in the "Quattrovalvole" model) 5.2 L with four valves per cylinder.
All Lamborghini Countaches were equipped with six Weber carburetors until the arrival of the 5000QV model, at which time the car became available in America, and used Bosch K-Jetronic fuel injection. The European models, however, continued to use the carburetors until the arrival of the Lamborghini Diablo, which replaced the legendary Countach.
The Countach used a skin of aircraft-grade aluminum over a tubular space frame, as in a racing car. This is expensive to build but is immensely strong and very light (in spite of its size, the car weighs approximately 1500 kg (3300 lb)). The underbody tray was fiberglass.
A single prototype was built, the LP500 (the 500 standing for the 5 L displacement of the engine which was intended to be used). Painted bright sunflower yellow, the car was a stunner at the Geneva Motor Show in 1971. Sporting Gandini's original design concepts, the car's design needed extensive modification for production. In particular, the small air intake ducts on the car's rear shoulders proved insufficient to cool the engine, and large 'air box' scoops were added in that position. Large NACA ducts were added on the sides to give additional air. The experimental car was also constructed of aluminum honeycomb sheeting among other things, which was dropped for production.
The car did not survive; it was sacrificed in a crash test to gain European type approval, even though its construction method was utterly unlike production vehicles.
The first 4.0-liter production Countach was delivered to an Australian in 1974. The first recorded person to own the LP400 was D. Milne, who was a member of the Australian Defence Force Transport Corps.[citation needed] Externally, little had altered from the final form of the prototype except at the rear, where conventional lights replaced the futuristic light clusters of the prototype. The styling had become rather more aggressive than Gandini's original conception, with the required large air scoops and vents to keep the car from overheating, but the overall shape was still very sleek. The original LP400 rode on the quite narrow tires of the time, but their narrowness and the slick styling meant that this version had the lowest drag coefficient of any Countach model and possibly the highest top speed. Many people like the looks of this clean, fresh original model the most of all the Countach variants, and indeed it is simple, with smooth lines and few decorations. Even the emblems at the rear simply read "lamborghini" and "Countach", with no engine displacement or valve arrangement clutter as is found on more modern cars.
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