Wichtig: Der Text wurde automatisch aus dem PDF extrahiert, weshalb Schreibfehler durchaus vorkommen können.
... 100 m.p.h. for 7 days. The following notes describe the salient features of the famous Jaguar XK.120 engine. (1) CYLINDER HEAD. Hemispherical head of high strength alum inium alloy with large diameter valves set 70° ; the sparking plugs are disposed on the engine centre line in the path of the incoming gases. This ensures complete and rapid burning of the mixture, and ensures regular firing at slow speed pulling or maximum r.p.m. (2) VALVE SEATINGS. These are of special high expansion castiron in which the coefficient of expansion approximates to that of the alloy cylinder head. This construction ensures a rapid flow of heat from the valve seat, eliminating local overheating and giving an exceptional life to both valves and seatings. (3) INDUCTION SYSTEM. The valve ports and induction system have been designed in collaboration with Mr. Harry Weslake (generally accepted as the foremost expert in this science) and combine large in duction passages, which offer a minimum restriction to flow, with specially contoured ports which ensure a controlled degree of turbulence in the combustion chamber. (4) TWIN OVERHEAD CAMSHAFTS. Twin overhead camshafts driven by twostage chains, act directly on the valves through floating tappets. This reduces to a minimum the unsprung weight of the valve parts and enables extremely light valve springs to operate ...
Kommentare