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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
  
  


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