The monarch later purchased a Carrera 6, and the 904 now belongs to the Porsche Muse-um. But before Dieter Wurster is finished, the engine must successfully undergo a special ordeal, namely a stint at the performance test bank. The noise level at test bank number four in Zuffenhausen is very high. The 904 engine revs up again and again over the course of almost an entire day. A special program drives it for a good three hours, at which Wurster then pushes the accelerator lever forward in a single swift stroke.
Customers occasionally observe the tests.
While the engine spins away it's time for some stories. Several decades ago, one of the cars was owned by the Formula driver Carel Godin de Beaufort. The engines that Beaufort drove were listed as having 164 horsepower, but often they only reached 155. Like every racing driver, the Dutchman wanted more. With this prospect before their eyes, the mechanics weakened just a single time.