Internal friction has been reduced by 12 per cent through all manner of tweaks: DLC (Diamond Like Coating) for the tappets, superfinished cam lobes, a new shape for the crankshaft weights and a new design of piston skirt. (evo.co.uk)
In order to achieve the optimum volumetric efficiency in the lower portion of the engine's operating range, rocker arms are programmed to follow cam lobes that provide low lift and reduced duration (shorter time open with less valve lift). (hondanews.com)