The Diavel’s heart is the Ducati Testastretta 11° Dual Spark (DS) – developed directly from the incredibly powerful, world-beating race engines of Ducati Corse. Ducati’s Testastretta 11° DS harnesses the immense power of the Superbike engine and makes it smoother and more linear, combining high performance with an enjoyable and perfectly manageable ride.To create an engine with this blend of brute power and supreme usability, Ducati carefully developed its cam timing with a particular focus on the valve overlap angle. Defined as the period of crankshaft rotation (in degrees) during which both intake and exhaust valves are open at the same time, this overlap angle is set at 11° on the Diavel’s engine – much less than the 41° used by Ducati’s Superbike engines. As a result the fresh inlet charge is less compromised by exiting exhaust gases, resulting in smoother combustion, improved fuel economy, and lower exhaust emissions.
The transmission features an oil bath clutch with “slipper” function and super-light feel at the lever. Its design uses a progressive self-servo mechanism that presses the plates together when under drive from the engine, enabling the use of lower clutch spring rates. This results in a much lighter lever feel at the handlebar, ideal in stop-and-go traffic or during long journeys.
When the drive force is reversed (over-run), the same mechanism reduces the pressure on the clutch plates, enabling them to provide a race-like “slipper” action, which reduces the destabilizing effect of the rear end under aggressive downshifting and also provides a much smoother feeling when closing the throttle or downshifting under normal riding conditions.