The BMW 1800 was the successor to the 1500 saloon. It was launched in September of 1963 and came equipped with a 1773cc, 90 horsepower engine. The BMW 1800ti (Turismo Internazionale) version continued the company's trend towards sporting motoring by delivering 110bhp, courtesy of twin side draft Solex carburetors and an increased compression ratio of 9.5:1, while the chassis featured stiffer suspension. The 1800ti enjoyed success in motorsports, clinching numerous victories, including Hubert Hahne winning the German Circuit Championship in 1964.
BMW 1800 Ti/SA 'homologation specials' were campaigned successfully by the works team in the mid-1960s, most notably by Hubert Hahne and Rauno Aaltonen. The BMW Ti/SA was introduced in 1961 and was based on the 1800TI (Turismo Internationale). Power was supplied by a four-cylinder, overhead-camsahft engine with cast iron block and alloy cylinder head, which would evolve into one of the foremost competition units of its era.
Built to meet the then current touring car race regulations, the limited edition 1800Ti/SA (Sonderausführung special edition) came with a 130bhp engine (20bhp more powerful than that of the stock 1800TI) incorporating a counter-weighted crankshaft, larger valves, 10.5:1 compression ratio, competition camshaft and two twin-choke Weber carburetors. There was also a five-speed gearbox, the latter relatively rare on road cars at the time. The running gear was up-rated appropriately to cope with the increased performance, featuring larger front hubs and bearings, larger brake discs, stiffer anti-roll bars and quicker steering. The interior features Restall-Masterfit seats, central rev counter and special wood-rim steering wheel. Tested by Auto, Motor und Sport magazine in 1964, a BMW 1800 Ti/SA achieved a top speed of 192km/h (119mph) a quite exceptional figure for an under 2-litre saloon.
Intended to raise BMW's international sporting profile, the 1800Ti/SA succeeded brilliantly; Hubert Hahne won the German national championship in 1964 and with co-driver Rauno Aaltonen disputed the lead of the Spa 24-Hour race with a Mercedes-Benz 300SE, eventually finishing second. BMW went one better the following year when Pascal Ickx and Gerald Langlois' 1800Ti/SA secured the first of the Munich manufacturer's string of victories in this prestigious event. The roll call of Ti/SA drivers also includes Dieter Glemser, Josef Schnitzer (Schnitzer Motorsport), Willy Mairesse, Jacky Ickx, Dieter Quester, Freddy Kottulinsky, Gijs van Lennep, Helmut Kelleners, Clemens Schickentanz and Wim Loos, among others.
Just 200 factory-built Ti/SAs were built.
In its ultimate, turbo-charged, Formula 1 incarnation this extremely versatile little engine produced up to 1,500bhp in qualifying trim, powering Nelson Picquet's Brabham to the Drivers' World Championship in 1983.