BMW M3 Celebrates 25th Birthday

German car maker BMW is celebrathing 25 years of BMW M3. It all started in mid-1986. At that moment the first series so the daylight packing 200hp, a top speed in excess of 230km/h, sprint from a standing start to 100km/h inside 6.7 seconds. Let’s share with you the story of the M3 and how it all started.

The M3 project was launched just a few months earlier. Production of the M1 mid-engine sports car had already been discontinued for some time and BMW CEO Eberhard Kuenheim commissioned a design for a successor, almost as an aside, according to legend. After one of his regular visits to Motorsport GmbH in Munich’s Preußenstraße he said, almost as he was leaving: “Mr. Rosche, we need a sporty engine for the 3 Series.”

The first basis was a two-litre engine with four cylinders. Four cylinders meant less weight and high torque, an ideal platform for a sports engine in the projected displacement class. Naturally enough, the series four-cylinder engine was much too tame for a sports engine. The BMW design engineers increased the displacement to 2.3 litres and applied a four-valve engineering. There was also another reason for the decision to opt for a four-cylinder engine and not adopt the six-cylinder engine introduced in the BMW 3 Series. The longer crankshaft in the big engine started to vibrate much earlier than the shorter four-cylinder shaft. The design engineers therefore designed the crankshaft drive of the BMW M3 with sufficient torsional stability to achieve 10,000 revolutions a minute and more. By comparison with the four-cylinder engine installed in the series vehicles, this represented an increase of more than 60 percent. The rated speed for the road version of the BMW M3 was still significantly below the critical range at 6,750/min and therefore offered sufficient scope for further developments.

Paul Rosche recalls:

We started work immediately. One advantage was that the big six-cylinder engine originally had the same cylinder gap as the four-cylinder engine. We therefore cut two combustion chambers off the four-cylinder head of the M88 and bolted a panel over the hole on the rear side. This meant that the new four-cylinder engine had a second forebear. The six-cylinder engine that had initially created a sensation in the M1 and had meanwhile transformed the M635CSi into one of the fastest coupés in the world. Whether you believe it or not – we had created an outstanding four-cylinder engine for the 3 Series within the space of two weeks. Under the development name S14, this engine was to generate headlines in sport and in volume production over the years to come. One Sunday, I drove to von Kuenheim’s flat and gave him the car for a test drive. When he came back he said: ‘Good, I like it.’ And that’s how the M3 came into being.

If you want to continue reading about the heritage of the BMW M3 than check this wonderful story made by BMWblog.