9mm vs 11mm pumps

[mark_airey]

yeah i understand that, but the advance high in the rpm range would be added by dynamic advance rather than static. as far as i know, static advance may give a bit of a power increase but at the cost of much greater forces through the engine, particularly the conrods.

More static advance means that the dynamic advance advances the timing that little bit further at full chat thus increasing the power higher up the revs