STW

The design of the Opel engine for the Super Touring Car Championship (STW) represented the logical consequence to the Formula 3 successes. The STW regulations stipulated an engine limited to 8,500rpm. Still, Spiess achieved an impressive 314bhp, with this 2-liter power unit. A completely newly designed cylinder head that was turned by 180°, in the engine bay, resulting in a significantly shorter exhaust way. The know-how used by Spiess for designing the cylinder head and the camshaft was crucial on the way to the motor-racing success.