Napier L48 modifications 1904-1908
As designed, F-head engine had inlet-valves with flat seats, sealing against three concentric circular areas. with holes through each valve-head (Benz and Mercedes persisted with what Bob Chamberlain calls "this…
The Nordschleife is split into natural sections, making it comparatively easy to learn. Starting through Hatzenbach there’s a series of medium-fast left-right curves, originally with nasty, sharp little white kerbs where a puncture could mean the end of your race.