The new engine retains the same 101.0 x 73.0mm bore-and-stroke measurements of the previous R1200, but that is where the commonality ends. The thermodynamic section is totally new and much more rationally designed and laid out than it was in the last “radial-valve” unit that, among other complexities, included camshafts with one inlet and one exhaust cam lobe each. Now, the dohc valvetrain is simplified and driven by a single loop of chain. Valve diameters are 40mm (inlet) and 34mm (exhaust), and the valves are angled at 8 degrees and 10 degrees, respectively, for an included angle of only 18 degrees. This narrow included angle and the finger-type cam followers are also inspired by F1 engines. The combustion chamber is very compact and a 12.5:1 compression ratio has been achieved with slightly dished pistons for a high thermodynamic efficiency.