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http://en.wikipedia.org/wiki/BMW_M10
Quote:
The BMW M10/M12 was an I4 piston engine produced from 1961 to 1987. Displacement ranged from 1499 cm3 to 1990 cm3.
The engine was designed by Baron Alex von Falkenhausen, noted engineer and race driver. He was asked to design a small-displacement (1.3 L) engine, but felt that this would be insufficient for the company's future needs. Therefore, he designed a block that could be expanded to 2.0 L and delivered it at 1.5 L.
The design was very successful, with over 3.5 million produced, and it served the company for over 20 years.
The M10 engine is also one of the most successful engines in racing. Starting with the European Touring Car Championship, it was also used in Formula 2, then the Deutsche Rennsport Meisterschaft, were it was turbocharged by Paul Rosche according to FIA Group 5 rules.
The M10 block went on to Formula 1, winning the 1983 championship for Nelson Piquet and Brabham - something which very few 20 year old road car engine designs accomplish. The same applies for the rise in power, twenty-fold from 75 hp to about 1500 hp.