The1 liter) V4 engine.
The Panigale V4's engine is a four-cylinder, liquid-cooled engine that features a 90-degree V-angle between the cylinders. It utilizes Ducati's Desmodromic valve system, which uses a mechanical system to both open and close the engine's valves. This design is a departure from Ducati's previous tradition of using L-twin engines in their sportbikes.
The Panigale V4 R, a higher-performance version of the Panigale V4, features a 998cc (1.0 liter) V4 engine that has been specially tuned for increased power and performance. It has a higher redline and incorporates various lightweight and racing-inspired components to optimize performance on the track.
It's important to note that Ducati continuously updates and introduces new models, so it's always a good idea to refer to the latest information from Ducati or an authorized Ducati dealer for the most accurate and up-to-date details on the engine specifications of their motorcycles.