The DB4 is a sports car sold by Aston Martin from 1958 until 1963. Technically it was a development of the DB Mark III it replaced but with a completely new body. The DB4's design formed the basis for later Aston Martin classics, such as the DB4 GT Zagato, the Lagonda Rapide 4-door saloon, it was eventually replaced by the Aston Martin DB5. The lightweight superleggera (tube-frame) body was designed by Carrozzeria Touring in Milan, and its Continental looks caused a sensation on its unveiling at the 1958 London Motor Show. Although the design and construction techniques were Italian, the DB4 was the first Aston to be built at the company's Newport Pagnell works in Buckinghamshire, England. The 3.7 L (3670 cc/223 in³) engine, designed by Tadek Marek, was a double overhead cam straight-6, with cylinder head and block of cast R.R.50 aluminium alloy, a further development of the earlier engine. The engine was prone to overheating initially, but the 240 hp (179 kW) produced by the twin-SU carburettor version made buyers forgive this unfortunate trait[citation needed]. Servo-assisted disc brakes were fitted all round: early 11.5 in (292 mm) Dunlops were replaced by Girlings. The independent front suspension used ball-jointed wishbones, coil springs and rack-and-pinion steering. The live rear axle also used coil springs and was located by a Watt's linkage. The normal final-drive ratio for British and European use was 3.54:1: in the United States the ratio was usually 3.77. Customers wanting a car with an especially high top speed could choose a 3.31:1 ratio. A car with the British standard 3.54 final drive ratio tested by The Motor magazine in 1960 had a top speed of 139.3 mph (224.2 km/h) and could accelerate from 0-60 mph (97 km/h) in 9.3 seconds. A fuel consumption of 17.7 miles per imperial gallon (16.0 L/100 km; 14.7 mpg-US) was recorded. The test car cost £3967 including taxes.
