When Opel introduced the GT exactly 50 years ago, the company was already successfully competing in various European races with models like the Rallye Kadett, the Rekord Sprint and the Commodore GS. The GT was also designed with motorsport in mind, and to showcase Opel’s changing image with its sheer looks. ‘Only flying is more exciting’ was the advertising slogan for the Opel GT. The Grand Tourisme coupé didn’t do battle with the touring cars, though. Instead, it was the perennial outsider among the Porsche 911 and 914/6, the lightweight Renault Alpine A110, the Lancias, Alfas and other two-litre cars. The GT entered the racing and rallying competition during the late 1960s, a spectacular era of motorsport. One of the professional tuners who helped extract every last bit of performance from the car was Virgilio Conrero. The Italian ‘magician’ would have turned 100 this year.
Throughout the development of the GT with its various evolutionary stages, one question more than any other divided opinions at Opel in Rüsselsheim: where the engine should be positioned in the car. The GT was based on the Kadett platform, and given that it had the same front axle, it was logical for the engineers to place the engine right there. That would have been the simplest and, above all, most cost-effective solution, but the resulting weight distribution and handling were less than optimal. Moreover, having the engine at the front was a bad fit with the proposed design of the car, which envisioned a low front hood.
The American Bob Lutz, a young Marketing and Sales manager at Opel, proposed putting the engine behind the axle. After quite a bit of discussion, the decision was made to compare both designs at a test session. Hans Herrmann and Eberhard Mahle were enlisted to do some laps at the Nürburgring in July 1966. The cars used were the experimental GT which had been on display at the 1965 International Motor Show Germany and the prototype from Technical Management.
Lutz later recalled being very impressed by how the test session went. Both experimental GTs had identical 1.9-litre engines. The test was ‘blind’, meaning that neither driver knew which car was fitted with the forward engine and which one with the centrally-mounted version. Although both GTs were good, Herrmann noticed immediately that the car with the conventional engine position was lazier to react, showed more understeer and had a greater tendency towards lateral movement. The GT with the centrally-mounted engine, by contrast, had a more pleasant, neutral handling and achieved better lap times. It felt more like a sports car: quick, easily manoeuvrable, and well-balanced. Eberhard Mahle was more reserved in his judgement, but Hans Herrmann unequivocally supported the centrally-mounted version…
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by Maurice van Sevecotte/Stefan Müller
Photographs: Kräling, Collection Maurice van Sevecotte