From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Document detailing the specifications of engine valve springs for Delaunay Belleville and Lanchester models.
Identifier | ExFiles\Box 80\3\ scan0246 | |
Date | 18th March 1913 | |
Particulars of Valve springs (Engine) Delaunay Belleville (Coil spring) Length of spring, valve closed = 2.5" " " " open = 2.156" Strength " " " closed = 38 lbs " " " open = 55" Length fully extended = 3.25" No. of coils = 9 Outside Diameter = 1.3125" Thickness of wire = .148" Lanchester (Flat spring) Movement of valve = 3/8" Strength of spring valve closed = 35 lbs " " " open = 45" Inlet & exhaust springs alike in both cases. LofL | ||