developed with the 1500 included separation of the semi-trailing arm mounts from the body, rear axle failure, and gearbox problems. These were resolved in later versions of the New Class sedan. The 1500 was replaced in 1964 by the 1600, but it was still made available in markets where capacities greater than 1500 cc incurred higher tax rates. 1800 Introduced in September 1963, the BMW 1800 was the second member of the New Class family. This model had an M10 engine with an bore and stroke, giving a displacement of 1,773 cc. It produced at 5,250 rpm and at 3,000 rpm. The 1800 TI (Turismo Internazionale) model featured components developed for the 1800 by the tuning company Alpina. The upgrades included dual Solex PHH side-draft carburetors and higher-compression pistons for at 5,800 rpm and at 4,000 rpm. A homologation special, the 1800 TI/SA, was introduced in 1964. The TI/SA's engine had dual Weber DCOE-45 carburetors and a 10.5:1 compression ratio. This engine produced at 6,100 rpm and at 5,250 rpm. The TI/SA also had a Getrag five-speed gearbox, stronger anti-roll bars, and larger-diameter brake discs than the TI. 200 examples of the TI/SA were built and were only sold to licensed racing and sports drivers. An automatic transmission option was introduced in 1966 and in 1967 the 1800 was generally updated along with the 2000. The updates included interior changes (a modernized dashboard design and simpler door panels) as well as styling changes to the front grilles. In 1968 the 1,773 cc engine used in the 1800 was replaced by an engine with the bore of the 2.0 L engine and the original stroke, which resulted in a displacement of 1,766 cc and a stroke/bore ratio of 0.798:1 (compared with the previous 1800 engine's ratio of 0.952:1). 1600 The 1600, introduced as the replacement to the 1500 in 1964, used the bore of the 1800 with the 1500s stroke, resulting in a displacement of 1,573 cc, a power output of at 5,500 rpm and at 3,000 rpm. The 1600 was produced until early 1971. 2000 The engines from the 2000C and 2000CS coupes were used in the 4-door sedan body for the 2000 and 2000TI models. The 2000 sedan, released in 1965, used the engine from the 2000 C. The 2000TI sedan, released in 1966, used the engine from the 2000 CS with twin Solex PHH side-draft carburetors. Intended as