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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).
Specification chart for Delco low-pressure valve spring ratings for 'C' and 'G' types, detailing load and deflection for outer and inner springs.

Identifier  ExFiles\Box 28\1\  Scan223
Date  3rd February 1931
  
DELCO VALVE SPRING RATINGS
LOW PRESSURE. 'C' & 'G' TYPES.

OUTER SPRING
LOAD Lb. | DEFLECTION - INS.
'C' | 'G'
0 | — | —
10 | .045 | .025
20 | .085 | .049
30 | .125 | .072
40 | — | .095
50 | — | .118

INNER SPRING
LOAD Lb. | DEFLECTION - INS.
'C' | 'G'
0 | — | —
2 | .135 | .135
4 | .269 | .270
5 | .338 | .335

3-2-31.
  
  


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