40 years ago, Audi presented the first five-cylinder petrol engine in the second-generation Audi 100. Enhancements and new developments followed, with turbocharging, emissions control and four-valve technology, rally engines and five-cylinder diesel units. Today, the 2.5 TFSI in the Audi TT RS Coupé and Roadster carries on the great tradition of five-cylinder powerplants.

The five-cylinder engines from Audi have achieved cult status – partly due to their successful deployment in motorsport and also on account of their reliability and economy. They have played a vital role in defining Vorsprung durch Technik and to this day provide an emotional driving experience with their characteristic sound.

The first five-cylinder petrol engine powered the Audi 100 (C2) in 1976. The model, known internally as Type 43, was to be positioned higher than its predecessor in the market. The four-cylinder engines at the time were not suitable for this plan according to the developers. At the beginning of the 1970s, Audi engineers consequently discussed the possibility of introducing five and six-cylinder inline engines. The latter were ruled out due to the installation space required and unfavourable weight distribution. So those responsible opted for the five-cylinder inline engine, based on the new EA 827 engine concept.

This four-cylinder inline engine was used throughout the VW Group in the 1970s – in the Audi 80 and Audi 100, for instance. The derived 2.1-liter five-cylinder engine produced 136PS. A modern injection system increased efficiency and power development. Delivery of the Audi 100 5E began in March 1977.

As early as 1978, Audi presented the first diesel version: a naturally aspirated diesel with a displacement of two litres and producing 70PS. One year later, the first turbocharged five-cylinder petrol engine made its debut – another pioneering feat from Audi. With an output of 170PS and 265 newton metres (195.45 lb-ft) of torque, it powered the new top model, the Audi 200 5T. The five-cylinder petrol engine in the 1980 Audi “Ur-quattro” had even more to offer.