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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).
Weight specifications and comparisons for various types of large inlet valves.

Identifier  ExFiles\Box 17\6\  Scan127
Date  8th August 1933
  
X7060.
P.II. LARGE INLET VALVES.
STANDARD INLET VALVE - 146.25 grms.
" & CAP, COTTERS ETC. - 176.67 grms.
---------
LARGE INLET VALVE
(Original one with regrinding lip) - 179.94 grms.
VALVE + CAP & COTTERS ETC. 216.03 grms.
---------
LIGHTENED VALVE - 161 grms.
" & CAP, COTTERS ETC. 191.42 grms.
- i.e. 8.36% heavier than standard.
---------
Reduction in wt. due to drilling hole 1/8" bore 4" long
= 6.3 grms.
Wt. of valve then = 154.7 grms.
i.e. 4.8% heavier than standard.
Hs{Lord Ernest Hives - Chair}/Std.
  
  


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