Fuhrmann was responsible for the so-called Fuhrmann-engine, used in the 356 Carrera models as well as the 550 Spyder, having four overhead camshafts instead of a central camshaft with pushrods, as in the Volkswagen-derived serial engines.
Fuhrmann buvo atsakingas už Fuhrmann variklį, naudotą 356 Carrera modeliuose, kaip ir 550 Spyder, turintį keturis kumštelinius velenus vietoj vieno centrinio veleno, kokie naudoti Volkswagen serijiniuose varikliuose.